Re: [linus:master] [mm] cacded5e42: aim9.brk_test.ops_per_sec -5.0% regression

From: Lorenzo Stoakes
Date: Fri Oct 11 2024 - 03:27:36 EST

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On Fri, Oct 11, 2024 at 10:46:13AM +0800, Oliver Sang wrote:
> hi, Lorenzo,
>
> On Wed, Oct 09, 2024 at 10:24:58PM +0100, Lorenzo Stoakes wrote:
> > On Wed, Oct 09, 2024 at 02:44:30PM +0800, Oliver Sang wrote:
> > [snip]
> > > >
> > > > I will look into this now, if I provide patches would you be able to test
> > > > them using the same boxes? It'd be much appreciated!
> > >
> > > sure! that's our pleasure!
> > >
> >
> > Hi Oliver,
> >
> > Thanks so much for this, could you give the below a try? I've not tried to
> > seriously test it locally yet, so it'd be good to set your test machines on
> > it.
> >
> > If this doesn't help it suggests call stack/branching might be a thing here
> > in which case I have other approaches I can take before we have to
> > duplicate this code.
> >
> > This patch is against the mm-unstable branch in Andrew's tree [0] but
> > hopefully should apply fine to Linus's too.
> >
> > [0]:https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/
> >
> > Thanks again!
>
> you are welcome!
>
> I found the patch could be applied directly on cacded5e42, so I did it.
> this is our normal practice that we want to avoid impacts from other commits.
>
> but if your patch should reply on some new patches in mm-unstable or mainline,
> please let me know. I could reapply and retest.
>
> I mentioned patch base since I found by my applyment upon cacded5e42, your
> patch seems not have obvious performance impact, still have similar regression.
>
> for brief, I just list 2 examples here. all tests and full data are attached
> as fc21959f74bc11-cacded5e42b960-2e71337ac26478

Thanks for testing this suffices to rule this one out... I will try to get a
functional and reliable performance environment locally so I can properly
address this and then we can try something else.

Thanks!
Lorenzo

>
> (1)
>
> model: Sapphire Rapids
> nr_node: 2
> nr_cpu: 224
> memory: 512G
> brand: Intel(R) Xeon(R) Platinum 8480CTDX
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/testtime:
> gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-spr-2sp4/brk_test/aim9/300s
>
> commit:
> fc21959f74bc11 ("mm: abstract vma_expand() to use vma_merge_struct")
> cacded5e42b960 ("mm: avoid using vma_merge() for new VMAs")
> 2e71337ac26478 ("mm: explicitly enable an expand-only merge mode for brk()")
>
> fc21959f74bc1138 cacded5e42b9609b07b22d80c10 2e71337ac2647889d3d9d76a5ce
> ---------------- --------------------------- ---------------------------
> %stddev %change %stddev %change %stddev
> \ | \ | \
> 3540976 -6.4% 3314159 -6.7% 3302864 aim9.brk_test.ops_per_sec
>
>
> (2) which is using same Ivy Bridge-EP in our original report
> (test machine: 48 threads 2 sockets Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz (Ivy Bridge-EP) with 64G memory)
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/testtime:
> gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-ivb-2ep2/brk_test/aim9/300s
>
> commit:
> fc21959f74bc11 ("mm: abstract vma_expand() to use vma_merge_struct")
> cacded5e42b960 ("mm: avoid using vma_merge() for new VMAs")
> 2e71337ac26478 ("mm: explicitly enable an expand-only merge mode for brk()")
>
> fc21959f74bc1138 cacded5e42b9609b07b22d80c10 2e71337ac2647889d3d9d76a5ce
> ---------------- --------------------------- ---------------------------
> %stddev %change %stddev %change %stddev
> \ | \ | \
> 1322908 -5.0% 1256536 -4.1% 1268145 aim9.brk_test.ops_per_sec
>
> >
> > Best, Lorenzo
> >
> >
> > ----8<----
> > From 7eb4aa421b357668bc44405c58b0444abf44334a Mon Sep 17 00:00:00 2001
> > From: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
> > Date: Wed, 9 Oct 2024 21:57:03 +0100
> > Subject: [PATCH] mm: explicitly enable an expand-only merge mode for brk()
> >
> > Try to do less work on brk() to improve perf.
> > ---
> > mm/mmap.c | 1 +
> > mm/vma.c | 25 ++++++++++++++++---------
> > mm/vma.h | 11 +++++++++++
> > 3 files changed, 28 insertions(+), 9 deletions(-)
> >
> > diff --git a/mm/mmap.c b/mm/mmap.c
> > index 02f7b45c3076..c2c68ef45a3b 100644
> > --- a/mm/mmap.c
> > +++ b/mm/mmap.c
> > @@ -1740,6 +1740,7 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma,
> > if (vma && vma->vm_end == addr) {
> > VMG_STATE(vmg, mm, vmi, addr, addr + len, flags, PHYS_PFN(addr));
> >
> > + vmg.mode = VMA_MERGE_MODE_EXPAND_ONLY;
> > vmg.prev = vma;
> > vma_iter_next_range(vmi);
> >
> > diff --git a/mm/vma.c b/mm/vma.c
> > index 749c4881fd60..f525a0750c41 100644
> > --- a/mm/vma.c
> > +++ b/mm/vma.c
> > @@ -561,6 +561,7 @@ struct vm_area_struct *vma_merge_new_range(struct vma_merge_struct *vmg)
> > unsigned long end = vmg->end;
> > pgoff_t pgoff = vmg->pgoff;
> > pgoff_t pglen = PHYS_PFN(end - start);
> > + bool expand_only = vmg_mode_expand_only(vmg);
> > bool can_merge_left, can_merge_right;
> >
> > mmap_assert_write_locked(vmg->mm);
> > @@ -575,7 +576,7 @@ struct vm_area_struct *vma_merge_new_range(struct vma_merge_struct *vmg)
> > return NULL;
> >
> > can_merge_left = can_vma_merge_left(vmg);
> > - can_merge_right = can_vma_merge_right(vmg, can_merge_left);
> > + can_merge_right = !expand_only && can_vma_merge_right(vmg, can_merge_left);
> >
> > /* If we can merge with the next VMA, adjust vmg accordingly. */
> > if (can_merge_right) {
> > @@ -603,13 +604,18 @@ struct vm_area_struct *vma_merge_new_range(struct vma_merge_struct *vmg)
> > return vmg->vma;
> > }
> >
> > - /* If expansion failed, reset state. Allows us to retry merge later. */
> > - vmg->vma = NULL;
> > - vmg->start = start;
> > - vmg->end = end;
> > - vmg->pgoff = pgoff;
> > - if (vmg->vma == prev)
> > - vma_iter_set(vmg->vmi, start);
> > + /*
> > + * Unless in expand only case and expansion failed, reset state.
> > + * Allows us to retry merge later.
> > + */
> > + if (!expand_only) {
> > + vmg->vma = NULL;
> > + vmg->start = start;
> > + vmg->end = end;
> > + vmg->pgoff = pgoff;
> > + if (vmg->vma == prev)
> > + vma_iter_set(vmg->vmi, start);
> > + }
> >
> > return NULL;
> > }
> > @@ -641,7 +647,8 @@ int vma_expand(struct vma_merge_struct *vmg)
> > mmap_assert_write_locked(vmg->mm);
> >
> > vma_start_write(vma);
> > - if (next && (vma != next) && (vmg->end == next->vm_end)) {
> > + if (!vmg_mode_expand_only(vmg) && next &&
> > + (vma != next) && (vmg->end == next->vm_end)) {
> > int ret;
> >
> > remove_next = true;
> > diff --git a/mm/vma.h b/mm/vma.h
> > index 82354fe5edd0..14224b36a979 100644
> > --- a/mm/vma.h
> > +++ b/mm/vma.h
> > @@ -52,6 +52,11 @@ struct vma_munmap_struct {
> > unsigned long data_vm;
> > };
> >
> > +enum vma_merge_mode {
> > + VMA_MERGE_MODE_NORMAL,
> > + VMA_MERGE_MODE_EXPAND_ONLY,
> > +};
> > +
> > enum vma_merge_state {
> > VMA_MERGE_START,
> > VMA_MERGE_ERROR_NOMEM,
> > @@ -75,9 +80,15 @@ struct vma_merge_struct {
> > struct mempolicy *policy;
> > struct vm_userfaultfd_ctx uffd_ctx;
> > struct anon_vma_name *anon_name;
> > + enum vma_merge_mode mode;
> > enum vma_merge_state state;
> > };
> >
> > +static inline bool vmg_mode_expand_only(struct vma_merge_struct *vmg)
> > +{
> > + return vmg->mode == VMA_MERGE_MODE_EXPAND_ONLY;
> > +}
> > +
> > static inline bool vmg_nomem(struct vma_merge_struct *vmg)
> > {
> > return vmg->state == VMA_MERGE_ERROR_NOMEM;
> > --
> > 2.46.2

> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/testtime:
> gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-gnr-1ap1/brk_test/aim9/300s
>
> commit:
> fc21959f74bc11 ("mm: abstract vma_expand() to use vma_merge_struct")
> cacded5e42b960 ("mm: avoid using vma_merge() for new VMAs")
> 2e71337ac26478 ("mm: explicitly enable an expand-only merge mode for brk()")
>
> fc21959f74bc1138 cacded5e42b9609b07b22d80c10 2e71337ac2647889d3d9d76a5ce
> ---------------- --------------------------- ---------------------------
> %stddev %change %stddev %change %stddev
> \ | \ | \
> 3220697 -6.0% 3028867 -6.4% 3014713 aim9.brk_test.ops_per_sec
> 24.58 -3.9% 23.63 -5.5% 23.24 time.user_time
> 119459 -3.2% 115601 -2.9% 115971 proc-vmstat.nr_active_anon
> 120943 -3.2% 117079 -2.9% 117450 proc-vmstat.nr_shmem
> 119459 -3.2% 115601 -2.9% 115971 proc-vmstat.nr_zone_active_anon
> 0.02 �120% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 3.27 � 5% +5112.4% 170.40 �218% +5144.5% 171.45 �216% perf-sched.sch_delay.max.ms.__cond_resched.__wait_for_common.affine_move_task.__set_cpus_allowed_ptr.__sched_setaffinity
> 0.20 �188% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.01 � 70% +100.0% 0.01 � 84% +3512.9% 0.19 �199% perf-sched.sch_delay.max.ms.irqentry_exit_to_user_mode.asm_sysvec_apic_timer_interrupt.[unknown]
> 0.93 � 16% -4.1% 0.89 � 14% -25.0% 0.70 � 11% perf-sched.sch_delay.max.ms.pipe_read.vfs_read.ksys_read.do_syscall_64
> 0.02 �120% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.20 �188% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.01 � 70% +100.0% 0.01 � 84% +3512.9% 0.19 �199% perf-sched.wait_time.max.ms.irqentry_exit_to_user_mode.asm_sysvec_apic_timer_interrupt.[unknown]
> 0.02 � 2% -4.1% 0.02 � 2% -6.3% 0.02 � 4% perf-stat.i.MPKI
> 1.767e+09 +4.2% 1.841e+09 +3.7% 1.833e+09 perf-stat.i.branch-instructions
> 0.45 -6.2% 0.42 -5.9% 0.42 perf-stat.i.cpi
> 8.347e+09 +6.6% 8.9e+09 +6.2% 8.863e+09 perf-stat.i.instructions
> 2.27 +6.6% 2.42 +6.0% 2.41 perf-stat.i.ipc
> 0.03 � 4% -2.0% 0.03 � 3% -7.8% 0.03 � 4% perf-stat.overall.MPKI
> 0.44 -5.9% 0.42 -5.4% 0.42 perf-stat.overall.cpi
> 2.25 +6.2% 2.39 +5.7% 2.38 perf-stat.overall.ipc
> 1.761e+09 +4.2% 1.834e+09 +3.7% 1.827e+09 perf-stat.ps.branch-instructions
> 8.319e+09 +6.6% 8.87e+09 +6.2% 8.834e+09 perf-stat.ps.instructions
> 2.519e+12 +6.4% 2.68e+12 +5.8% 2.665e+12 perf-stat.total.instructions
> 7.07 -7.1 0.00 -7.1 0.00 perf-profile.calltrace.cycles-pp.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 6.30 -6.3 0.00 -6.3 0.00 perf-profile.calltrace.cycles-pp.mas_preallocate.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 18.35 -1.0 17.36 -1.4 16.92 perf-profile.calltrace.cycles-pp.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 16.40 -0.9 15.47 -1.3 15.05 perf-profile.calltrace.cycles-pp.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64
> 10.17 -0.8 9.36 -1.2 8.93 perf-profile.calltrace.cycles-pp.perf_event_mmap_output.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags
> 11.92 -0.8 11.12 -1.3 10.64 perf-profile.calltrace.cycles-pp.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 5.07 � 3% -0.2 4.84 � 2% -0.2 4.88 � 3% perf-profile.calltrace.cycles-pp.__get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 5.40 � 3% -0.2 5.18 � 2% -0.1 5.28 � 3% perf-profile.calltrace.cycles-pp.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 3.66 � 2% -0.2 3.50 � 2% -0.1 3.52 � 3% perf-profile.calltrace.cycles-pp.thp_get_unmapped_area_vmflags.__get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64
> 0.60 � 5% -0.1 0.46 � 45% -0.2 0.36 � 70% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_safe_stack.brk
> 1.66 � 2% -0.1 1.56 � 3% -0.1 1.60 � 2% perf-profile.calltrace.cycles-pp.up_write.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.68 � 3% -0.1 0.60 � 5% -0.1 0.60 � 5% perf-profile.calltrace.cycles-pp.kfree.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 5.91 � 2% -0.1 5.85 -0.4 5.49 perf-profile.calltrace.cycles-pp.mas_find.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.97 � 4% -0.1 0.91 � 4% -0.1 0.91 � 3% perf-profile.calltrace.cycles-pp.mas_next_slot.mas_find.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 4.23 � 2% -0.0 4.21 -0.4 3.82 perf-profile.calltrace.cycles-pp.mas_walk.mas_find.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.37 � 70% +0.3 0.67 � 4% +0.2 0.57 � 44% perf-profile.calltrace.cycles-pp.strlen.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 0.00 +0.5 0.47 � 44% +0.6 0.58 � 5% perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.49 � 44% +0.5 1.02 � 5% +0.5 1.02 � 8% perf-profile.calltrace.cycles-pp.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 83.74 +0.5 84.28 +0.6 84.32 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.6 0.60 � 6% +0.6 0.58 � 7% perf-profile.calltrace.cycles-pp.mas_next_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.7 0.65 � 7% +0.7 0.66 � 4% perf-profile.calltrace.cycles-pp.mas_wr_slot_store.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +0.7 0.68 � 4% +0.7 0.67 � 8% perf-profile.calltrace.cycles-pp.percpu_counter_add_batch.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.7 0.68 � 2% +0.8 0.80 � 4% perf-profile.calltrace.cycles-pp.mas_next_slot.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 80.24 +0.7 80.95 +0.7 80.98 perf-profile.calltrace.cycles-pp.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.7 0.74 � 2% +0.8 0.76 � 2% perf-profile.calltrace.cycles-pp.vma_adjust_trans_huge.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +0.8 0.75 � 4% +0.8 0.81 � 5% perf-profile.calltrace.cycles-pp.can_vma_merge_after.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.8 0.81 � 3% +0.7 0.69 � 7% perf-profile.calltrace.cycles-pp.mas_prev.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.8 0.84 � 5% +0.8 0.84 � 6% perf-profile.calltrace.cycles-pp.__anon_vma_interval_tree_remove.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +1.3 1.30 � 5% +1.3 1.32 � 2% perf-profile.calltrace.cycles-pp.mas_prev_slot.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +1.4 1.35 � 4% +1.3 1.32 � 4% perf-profile.calltrace.cycles-pp.up_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.6 1.60 � 4% +1.6 1.56 � 4% perf-profile.calltrace.cycles-pp.up_write.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +1.8 1.76 � 2% +1.9 1.86 � 2% perf-profile.calltrace.cycles-pp.mas_leaf_max_gap.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range
> 0.00 +1.8 1.78 � 2% +1.6 1.64 � 4% perf-profile.calltrace.cycles-pp.init_multi_vma_prep.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +2.0 2.03 +2.0 2.04 � 2% perf-profile.calltrace.cycles-pp.down_write.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +2.1 2.06 � 3% +2.1 2.06 � 4% perf-profile.calltrace.cycles-pp.down_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +2.3 2.29 � 3% +2.4 2.37 � 2% perf-profile.calltrace.cycles-pp.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 53.64 +2.6 56.21 +2.6 56.28 perf-profile.calltrace.cycles-pp.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +3.1 3.14 � 2% +3.1 3.10 � 5% perf-profile.calltrace.cycles-pp.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +3.2 3.25 +3.6 3.64 � 3% perf-profile.calltrace.cycles-pp.mas_wr_store_type.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +3.8 3.84 +3.9 3.86 � 2% perf-profile.calltrace.cycles-pp.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +5.3 5.31 � 2% +5.7 5.67 � 2% perf-profile.calltrace.cycles-pp.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +6.1 6.07 +6.4 6.41 perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +27.7 27.74 +28.3 28.33 perf-profile.calltrace.cycles-pp.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +32.4 32.43 +33.0 33.02 perf-profile.calltrace.cycles-pp.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 18.49 -1.0 17.47 -1.5 17.01 perf-profile.children.cycles-pp.perf_event_mmap
> 6.54 -1.0 5.54 � 2% -0.7 5.90 � 2% perf-profile.children.cycles-pp.mas_preallocate
> 7.40 -1.0 6.40 � 2% -0.6 6.76 perf-profile.children.cycles-pp.mas_store_prealloc
> 5.68 -1.0 4.72 -1.0 4.66 � 3% perf-profile.children.cycles-pp.up_write
> 16.88 -0.9 15.93 -1.4 15.51 perf-profile.children.cycles-pp.perf_event_mmap_event
> 10.35 -0.8 9.53 -1.2 9.10 perf-profile.children.cycles-pp.perf_event_mmap_output
> 12.16 -0.8 11.35 -1.3 10.86 perf-profile.children.cycles-pp.perf_iterate_sb
> 4.02 � 2% -0.7 3.32 -0.3 3.72 � 3% perf-profile.children.cycles-pp.mas_wr_store_type
> 2.97 -0.6 2.37 � 3% -0.5 2.45 � 2% perf-profile.children.cycles-pp.mas_update_gap
> 1.36 � 8% -0.6 0.80 � 4% -0.5 0.86 � 4% perf-profile.children.cycles-pp.can_vma_merge_after
> 2.26 � 2% -0.5 1.80 � 2% -0.4 1.89 � 2% perf-profile.children.cycles-pp.mas_leaf_max_gap
> 3.71 � 2% -0.3 3.44 -0.3 3.42 � 4% perf-profile.children.cycles-pp.vma_complete
> 5.62 � 3% -0.2 5.40 � 2% -0.1 5.51 � 3% perf-profile.children.cycles-pp.check_brk_limits
> 3.83 � 2% -0.2 3.65 � 2% -0.2 3.67 � 3% perf-profile.children.cycles-pp.thp_get_unmapped_area_vmflags
> 0.66 � 7% -0.1 0.55 � 9% -0.1 0.54 � 6% perf-profile.children.cycles-pp.may_expand_vm
> 1.98 � 3% -0.1 1.86 � 2% -0.3 1.71 � 4% perf-profile.children.cycles-pp.init_multi_vma_prep
> 0.78 � 3% -0.1 0.69 � 4% -0.1 0.69 � 5% perf-profile.children.cycles-pp.kfree
> 0.15 � 12% -0.1 0.08 � 13% -0.1 0.07 � 23% perf-profile.children.cycles-pp.arch_vma_name
> 6.23 � 2% -0.1 6.17 -0.4 5.78 perf-profile.children.cycles-pp.mas_find
> 0.60 � 6% -0.1 0.54 � 8% -0.1 0.51 � 7% perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack
> 4.32 � 2% -0.0 4.30 -0.4 3.92 perf-profile.children.cycles-pp.mas_walk
> 0.20 � 8% -0.0 0.17 � 7% -0.0 0.15 � 14% perf-profile.children.cycles-pp.__x64_sys_brk
> 0.26 � 5% -0.0 0.24 � 9% -0.0 0.22 � 9% perf-profile.children.cycles-pp.__rb_insert_augmented
> 0.23 � 7% +0.0 0.24 � 18% +0.0 0.27 � 6% perf-profile.children.cycles-pp.hrtimer_interrupt
> 0.24 � 7% +0.0 0.24 � 18% +0.0 0.27 � 5% perf-profile.children.cycles-pp.__sysvec_apic_timer_interrupt
> 0.58 � 7% +0.1 0.66 � 7% +0.1 0.67 � 2% perf-profile.children.cycles-pp.mas_wr_slot_store
> 0.19 � 10% +0.1 0.31 � 10% +0.1 0.32 � 16% perf-profile.children.cycles-pp.rb_next
> 0.50 � 4% +0.1 0.62 � 7% +0.2 0.66 � 7% perf-profile.children.cycles-pp.mas_wr_store_entry
> 0.40 � 6% +0.1 0.53 � 6% +0.1 0.54 � 6% perf-profile.children.cycles-pp.strnlen
> 0.58 � 13% +0.2 0.75 � 4% +0.1 0.72 � 13% perf-profile.children.cycles-pp.strlen
> 0.96 � 6% +0.2 1.14 � 3% +0.2 1.16 � 3% perf-profile.children.cycles-pp.rcu_all_qs
> 0.68 � 3% +0.3 0.98 � 5% +0.3 1.01 � 6% perf-profile.children.cycles-pp.__anon_vma_interval_tree_remove
> 1.77 � 4% +0.3 2.09 +0.3 2.08 � 4% perf-profile.children.cycles-pp.__cond_resched
> 0.00 +0.4 0.36 � 9% +0.4 0.36 � 8% perf-profile.children.cycles-pp.mas_next_setup
> 0.36 � 8% +0.4 0.76 � 3% +0.4 0.76 � 9% perf-profile.children.cycles-pp.percpu_counter_add_batch
> 0.48 � 7% +0.4 0.90 � 6% +0.4 0.86 � 4% perf-profile.children.cycles-pp.mas_prev_setup
> 84.69 +0.5 85.19 +0.6 85.27 perf-profile.children.cycles-pp.do_syscall_64
> 0.67 � 9% +0.6 1.24 � 4% +0.6 1.27 � 7% perf-profile.children.cycles-pp.__vm_enough_memory
> 3.81 +0.6 4.39 +0.6 4.40 � 3% perf-profile.children.cycles-pp.down_write
> 80.98 +0.7 81.64 +0.7 81.71 perf-profile.children.cycles-pp.__do_sys_brk
> 1.05 � 4% +0.7 1.72 � 3% +0.8 1.82 � 3% perf-profile.children.cycles-pp.mas_next_slot
> 0.00 +0.7 0.70 � 6% +0.7 0.69 � 5% perf-profile.children.cycles-pp.mas_next_range
> 1.11 � 4% +1.0 2.10 � 3% +0.8 1.92 � 3% perf-profile.children.cycles-pp.mas_prev
> 2.82 � 3% +1.2 4.07 +1.3 4.09 � 2% perf-profile.children.cycles-pp.vma_prepare
> 1.54 � 4% +1.3 2.88 � 3% +1.3 2.84 � 3% perf-profile.children.cycles-pp.mas_prev_slot
> 54.97 +1.6 56.61 +1.8 56.79 perf-profile.children.cycles-pp.do_brk_flags
> 0.00 +28.6 28.64 +29.2 29.16 perf-profile.children.cycles-pp.vma_expand
> 0.00 +32.9 32.91 +33.4 33.37 perf-profile.children.cycles-pp.vma_merge_new_range
> 5.90 � 2% -3.5 2.37 � 4% -3.4 2.55 perf-profile.self.cycles-pp.do_brk_flags
> 5.36 � 2% -1.0 4.38 -1.0 4.36 � 3% perf-profile.self.cycles-pp.up_write
> 10.18 -0.8 9.36 -1.2 8.94 perf-profile.self.cycles-pp.perf_event_mmap_output
> 3.86 � 2% -0.7 3.18 -0.3 3.57 � 3% perf-profile.self.cycles-pp.mas_wr_store_type
> 1.28 � 7% -0.5 0.74 � 4% -0.5 0.78 � 4% perf-profile.self.cycles-pp.can_vma_merge_after
> 3.02 � 2% -0.5 2.52 � 4% -0.3 2.75 � 3% perf-profile.self.cycles-pp.mas_store_prealloc
> 2.19 � 2% -0.4 1.78 � 2% -0.3 1.87 � 2% perf-profile.self.cycles-pp.mas_leaf_max_gap
> 5.03 -0.4 4.67 -0.1 4.92 � 2% perf-profile.self.cycles-pp.__do_sys_brk
> 2.60 � 4% -0.3 2.27 � 5% -0.3 2.25 � 2% perf-profile.self.cycles-pp.mas_preallocate
> 1.89 � 4% -0.3 1.59 � 4% -0.3 1.62 � 5% perf-profile.self.cycles-pp.perf_event_mmap_event
> 1.71 � 4% -0.2 1.53 � 3% -0.2 1.50 � 5% perf-profile.self.cycles-pp.entry_SYSCALL_64
> 0.74 � 3% -0.2 0.57 � 7% -0.2 0.56 � 6% perf-profile.self.cycles-pp.mas_update_gap
> 1.89 � 4% -0.2 1.73 � 2% -0.3 1.62 � 4% perf-profile.self.cycles-pp.init_multi_vma_prep
> 1.58 � 4% -0.1 1.47 � 3% -0.2 1.42 � 4% perf-profile.self.cycles-pp.perf_event_mmap
> 1.27 � 2% -0.1 1.16 � 2% -0.1 1.19 � 9% perf-profile.self.cycles-pp.vma_complete
> 1.20 � 2% -0.1 1.12 � 4% -0.1 1.08 � 2% perf-profile.self.cycles-pp.do_syscall_64
> 0.69 � 2% -0.1 0.61 � 4% -0.1 0.60 � 5% perf-profile.self.cycles-pp.kfree
> 0.60 � 6% -0.1 0.54 � 8% -0.1 0.51 � 7% perf-profile.self.cycles-pp.entry_SYSCALL_64_safe_stack
> 1.60 � 2% -0.1 1.56 � 6% -0.1 1.55 perf-profile.self.cycles-pp.down_write_killable
> 4.24 � 2% -0.0 4.20 -0.4 3.84 perf-profile.self.cycles-pp.mas_walk
> 0.50 � 7% -0.0 0.47 � 9% -0.1 0.45 � 5% perf-profile.self.cycles-pp.may_expand_vm
> 0.42 � 4% +0.1 0.49 � 7% +0.1 0.53 � 6% perf-profile.self.cycles-pp.mas_wr_store_entry
> 0.15 � 10% +0.1 0.24 � 11% +0.1 0.23 � 19% perf-profile.self.cycles-pp.rb_next
> 0.58 � 8% +0.1 0.68 � 5% +0.1 0.71 � 6% perf-profile.self.cycles-pp.rcu_all_qs
> 0.37 � 5% +0.1 0.50 � 7% +0.1 0.50 � 4% perf-profile.self.cycles-pp.strnlen
> 0.54 � 13% +0.2 0.68 � 4% +0.1 0.64 � 14% perf-profile.self.cycles-pp.strlen
> 1.01 � 6% +0.2 1.17 � 2% +0.1 1.11 � 4% perf-profile.self.cycles-pp.__cond_resched
> 0.66 � 6% +0.2 0.83 � 2% +0.2 0.84 � 3% perf-profile.self.cycles-pp.vma_prepare
> 0.46 � 6% +0.2 0.67 � 7% +0.2 0.70 � 5% perf-profile.self.cycles-pp.__anon_vma_interval_tree_remove
> 0.34 � 12% +0.2 0.54 � 3% +0.2 0.58 � 9% perf-profile.self.cycles-pp.__vm_enough_memory
> 0.00 +0.3 0.29 � 10% +0.3 0.28 � 11% perf-profile.self.cycles-pp.mas_next_setup
> 0.32 � 11% +0.3 0.62 � 7% +0.3 0.58 � 8% perf-profile.self.cycles-pp.mas_prev_setup
> 0.23 � 7% +0.3 0.55 � 6% +0.3 0.55 � 10% perf-profile.self.cycles-pp.percpu_counter_add_batch
> 0.00 +0.4 0.35 � 7% +0.3 0.30 � 7% perf-profile.self.cycles-pp.mas_next_range
> 2.65 � 3% +0.4 3.00 � 2% +0.4 3.05 � 2% perf-profile.self.cycles-pp.down_write
> 0.64 � 5% +0.6 1.21 � 3% +0.5 1.12 � 5% perf-profile.self.cycles-pp.mas_prev
> 0.89 � 5% +0.7 1.54 � 3% +0.8 1.64 � 4% perf-profile.self.cycles-pp.mas_next_slot
> 1.46 � 4% +1.3 2.72 � 3% +1.2 2.70 � 3% perf-profile.self.cycles-pp.mas_prev_slot
> 0.00 +1.3 1.33 � 2% +1.2 1.16 � 4% perf-profile.self.cycles-pp.vma_merge_new_range
> 0.00 +3.5 3.54 � 3% +3.6 3.55 � 2% perf-profile.self.cycles-pp.vma_expand
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/testtime:
> gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-emr-2sp1/brk_test/aim9/300s
>
> commit:
> fc21959f74bc11 ("mm: abstract vma_expand() to use vma_merge_struct")
> cacded5e42b960 ("mm: avoid using vma_merge() for new VMAs")
> 2e71337ac26478 ("mm: explicitly enable an expand-only merge mode for brk()")
>
> fc21959f74bc1138 cacded5e42b9609b07b22d80c10 2e71337ac2647889d3d9d76a5ce
> ---------------- --------------------------- ---------------------------
> %stddev %change %stddev %change %stddev
> \ | \ | \
> 3669298 -6.5% 3430070 -6.8% 3420919 aim9.brk_test.ops_per_sec
> 23.53 -4.9% 22.38 -6.4% 22.03 time.user_time
> 491107 � 5% -7.2% 455906 � 6% -5.5% 464283 � 6% meminfo.Active
> 491011 � 5% -7.2% 455810 � 6% -5.5% 464155 � 6% meminfo.Active(anon)
> 505666 � 5% -7.0% 470410 � 5% -5.3% 478879 � 6% meminfo.Shmem
> 122753 � 5% -7.1% 113979 � 6% -5.5% 116019 � 6% proc-vmstat.nr_active_anon
> 899298 -1.0% 890515 -0.7% 892592 proc-vmstat.nr_file_pages
> 126417 � 5% -6.9% 117634 � 5% -5.3% 119701 � 6% proc-vmstat.nr_shmem
> 122753 � 5% -7.1% 113979 � 6% -5.5% 116019 � 6% proc-vmstat.nr_zone_active_anon
> 595.50 � 22% +53.6% 914.50 � 12% +17.1% 697.33 � 20% proc-vmstat.numa_hint_faults_local
> 17958 -4.3% 17188 � 2% -4.3% 17180 � 2% proc-vmstat.pgactivate
> 1817569 � 69% -43.1% 1035076 �127% +63.5% 2972153 � 3% numa-meminfo.node0.FilePages
> 16515 � 73% -29.4% 11657 �108% +79.5% 29650 numa-meminfo.node0.Mapped
> 1811617 � 69% -43.2% 1029482 �128% +63.8% 2967951 � 3% numa-meminfo.node0.Unevictable
> 40474 � 40% -61.8% 15444 � 40% -50.4% 20065 � 59% numa-meminfo.node1.KReclaimable
> 40474 � 40% -61.8% 15444 � 40% -50.4% 20065 � 59% numa-meminfo.node1.SReclaimable
> 484115 � 6% -7.3% 448760 � 6% -10.1% 435387 � 11% numa-meminfo.node3.Active
> 484083 � 6% -7.3% 448760 � 6% -10.1% 435387 � 11% numa-meminfo.node3.Active(anon)
> 485577 � 6% -7.3% 450224 � 6% -10.0% 436799 � 11% numa-meminfo.node3.Shmem
> 454393 � 69% -43.1% 258770 �127% +63.5% 743038 � 3% numa-vmstat.node0.nr_file_pages
> 4178 � 73% -28.5% 2988 �107% +81.6% 7590 � 2% numa-vmstat.node0.nr_mapped
> 452904 � 69% -43.2% 257370 �128% +63.8% 741987 � 3% numa-vmstat.node0.nr_unevictable
> 452904 � 69% -43.2% 257370 �128% +63.8% 741987 � 3% numa-vmstat.node0.nr_zone_unevictable
> 10118 � 40% -61.8% 3861 � 40% -50.4% 5016 � 59% numa-vmstat.node1.nr_slab_reclaimable
> 121015 � 6% -7.3% 112196 � 6% -10.1% 108836 � 11% numa-vmstat.node3.nr_active_anon
> 121371 � 6% -7.3% 112537 � 6% -10.1% 109168 � 11% numa-vmstat.node3.nr_shmem
> 121015 � 6% -7.3% 112196 � 6% -10.1% 108836 � 11% numa-vmstat.node3.nr_zone_active_anon
> 0.01 � 52% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.01 � 15% +7.0% 0.01 � 16% -100.0% 0.00 perf-sched.sch_delay.avg.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm
> 0.06 � 69% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.01 � 17% -3.8% 0.01 � 21% -100.0% 0.00 perf-sched.sch_delay.max.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm
> 400.06 +0.0% 400.07 -100.0% 0.00 perf-sched.wait_and_delay.avg.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm
> 10.00 +0.0% 10.00 -100.0% 0.00 perf-sched.wait_and_delay.count.irq_thread.kthread.ret_from_fork.ret_from_fork_asm
> 999.53 -0.0% 999.38 -100.0% 0.00 perf-sched.wait_and_delay.max.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm
> 0.01 � 52% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 400.05 +0.0% 400.06 -100.0% 0.00 perf-sched.wait_time.avg.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm
> 0.06 � 69% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 999.52 -0.0% 999.37 -100.0% 0.00 perf-sched.wait_time.max.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm
> 2.071e+09 +2.8% 2.128e+09 +2.8% 2.13e+09 perf-stat.i.branch-instructions
> 0.48 -4.2% 0.46 -4.9% 0.45 perf-stat.i.cpi
> 4.717e+09 -0.7% 4.686e+09 +0.1% 4.723e+09 perf-stat.i.cpu-cycles
> 9.794e+09 +5.1% 1.03e+10 +5.2% 1.03e+10 perf-stat.i.instructions
> 2.15 +5.8% 2.28 +5.5% 2.27 perf-stat.i.ipc
> 0.34 � 3% -0.0 0.33 -0.0 0.34 perf-stat.overall.branch-miss-rate%
> 0.48 -5.5% 0.46 -4.8% 0.46 perf-stat.overall.cpi
> 2.08 +5.8% 2.20 +5.1% 2.18 perf-stat.overall.ipc
> 2.063e+09 +2.8% 2.12e+09 +2.8% 2.122e+09 perf-stat.ps.branch-instructions
> 4.703e+09 -0.7% 4.672e+09 +0.1% 4.709e+09 perf-stat.ps.cpu-cycles
> 9.758e+09 +5.1% 1.026e+10 +5.2% 1.026e+10 perf-stat.ps.instructions
> 2.944e+12 +5.5% 3.106e+12 +5.0% 3.092e+12 perf-stat.total.instructions
> 6.54 � 2% -6.5 0.00 -6.5 0.00 perf-profile.calltrace.cycles-pp.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 6.22 -6.2 0.00 -6.2 0.00 perf-profile.calltrace.cycles-pp.mas_preallocate.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 17.43 -0.7 16.76 -1.0 16.39 perf-profile.calltrace.cycles-pp.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 9.69 � 2% -0.6 9.07 -1.0 8.73 perf-profile.calltrace.cycles-pp.perf_event_mmap_output.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags
> 11.30 � 2% -0.6 10.71 -0.9 10.35 perf-profile.calltrace.cycles-pp.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 15.57 -0.5 15.05 -0.8 14.73 perf-profile.calltrace.cycles-pp.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64
> 2.76 -0.1 2.62 � 3% -0.2 2.60 � 3% perf-profile.calltrace.cycles-pp.userfaultfd_unmap_complete.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.84 � 4% -0.1 0.74 � 8% -0.1 0.70 � 5% perf-profile.calltrace.cycles-pp.security_vm_enough_memory_mm.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.75 � 7% -0.1 0.68 � 10% -0.1 0.64 � 10% perf-profile.calltrace.cycles-pp.kthread.ret_from_fork.ret_from_fork_asm
> 0.75 � 7% -0.1 0.68 � 10% -0.1 0.64 � 10% perf-profile.calltrace.cycles-pp.ret_from_fork.ret_from_fork_asm
> 0.75 � 7% -0.1 0.68 � 10% -0.1 0.64 � 10% perf-profile.calltrace.cycles-pp.ret_from_fork_asm
> 1.12 � 5% +0.2 1.29 � 3% +0.2 1.29 � 2% perf-profile.calltrace.cycles-pp.sized_strscpy.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 0.65 � 6% +0.4 1.07 � 5% +0.4 1.07 � 4% perf-profile.calltrace.cycles-pp.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.5 0.48 � 45% +0.5 0.54 � 6% perf-profile.calltrace.cycles-pp.mas_next_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.5 0.54 � 4% +0.4 0.36 � 70% perf-profile.calltrace.cycles-pp.mas_wr_slot_store.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +0.5 0.55 � 4% +0.5 0.48 � 45% perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +0.7 0.66 � 4% +0.8 0.80 � 4% perf-profile.calltrace.cycles-pp.mas_next_slot.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.7 0.68 � 9% +0.7 0.71 � 5% perf-profile.calltrace.cycles-pp.percpu_counter_add_batch.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.7 0.68 � 4% +0.8 0.76 � 6% perf-profile.calltrace.cycles-pp.can_vma_merge_after.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.8 0.76 � 2% +0.8 0.77 � 7% perf-profile.calltrace.cycles-pp.vma_adjust_trans_huge.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 81.90 +0.8 82.67 +0.7 82.64 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.8 0.80 � 3% +0.7 0.65 � 8% perf-profile.calltrace.cycles-pp.mas_prev.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 80.94 +0.8 81.76 +0.8 81.74 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.8 0.82 � 3% +0.9 0.87 � 6% perf-profile.calltrace.cycles-pp.__anon_vma_interval_tree_remove.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 77.52 +1.0 78.50 +0.9 78.40 perf-profile.calltrace.cycles-pp.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +1.3 1.26 � 3% +1.3 1.33 � 5% perf-profile.calltrace.cycles-pp.mas_prev_slot.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +1.3 1.35 � 3% +1.3 1.30 � 4% perf-profile.calltrace.cycles-pp.up_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.6 1.56 � 2% +1.6 1.56 � 5% perf-profile.calltrace.cycles-pp.up_write.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +1.7 1.72 � 3% +1.7 1.66 � 3% perf-profile.calltrace.cycles-pp.init_multi_vma_prep.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.9 1.87 � 4% +1.9 1.94 � 4% perf-profile.calltrace.cycles-pp.mas_leaf_max_gap.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range
> 0.00 +2.1 2.07 � 2% +2.1 2.15 � 4% perf-profile.calltrace.cycles-pp.down_write.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +2.1 2.14 � 2% +2.1 2.12 � 3% perf-profile.calltrace.cycles-pp.down_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +2.4 2.37 � 2% +2.4 2.41 � 3% perf-profile.calltrace.cycles-pp.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 51.80 +2.9 54.66 +2.7 54.52 perf-profile.calltrace.cycles-pp.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +3.0 3.02 � 2% +3.2 3.17 perf-profile.calltrace.cycles-pp.mas_wr_store_type.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +3.1 3.06 +3.1 3.08 � 2% perf-profile.calltrace.cycles-pp.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +3.9 3.86 +4.0 3.96 � 2% perf-profile.calltrace.cycles-pp.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +5.0 5.01 +5.2 5.18 � 2% perf-profile.calltrace.cycles-pp.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +5.9 5.88 +6.1 6.10 perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +27.1 27.13 +27.4 27.39 perf-profile.calltrace.cycles-pp.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +31.6 31.63 +32.0 32.01 perf-profile.calltrace.cycles-pp.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 6.46 -1.2 5.24 -1.1 5.40 � 2% perf-profile.children.cycles-pp.mas_preallocate
> 5.54 -0.9 4.64 -0.9 4.63 � 3% perf-profile.children.cycles-pp.up_write
> 3.99 -0.9 3.10 � 2% -0.8 3.24 perf-profile.children.cycles-pp.mas_wr_store_type
> 17.57 -0.7 16.87 -1.1 16.50 perf-profile.children.cycles-pp.perf_event_mmap
> 9.85 � 2% -0.6 9.22 -1.0 8.90 perf-profile.children.cycles-pp.perf_event_mmap_output
> 6.82 � 2% -0.6 6.22 -0.4 6.43 perf-profile.children.cycles-pp.mas_store_prealloc
> 1.33 � 5% -0.6 0.75 � 4% -0.5 0.82 � 5% perf-profile.children.cycles-pp.can_vma_merge_after
> 11.53 � 2% -0.6 10.96 -1.0 10.58 perf-profile.children.cycles-pp.perf_iterate_sb
> 16.03 -0.5 15.50 -0.8 15.18 perf-profile.children.cycles-pp.perf_event_mmap_event
> 2.65 � 3% -0.2 2.40 � 3% -0.2 2.44 � 3% perf-profile.children.cycles-pp.mas_update_gap
> 2.18 � 2% -0.2 1.94 � 3% -0.2 1.99 � 3% perf-profile.children.cycles-pp.mas_leaf_max_gap
> 2.85 -0.2 2.70 � 3% -0.2 2.68 � 3% perf-profile.children.cycles-pp.userfaultfd_unmap_complete
> 3.52 -0.1 3.38 � 2% -0.1 3.38 � 2% perf-profile.children.cycles-pp.vma_complete
> 0.62 � 7% -0.1 0.48 � 9% -0.1 0.50 � 7% perf-profile.children.cycles-pp.may_expand_vm
> 1.92 � 2% -0.1 1.79 � 3% -0.2 1.73 � 3% perf-profile.children.cycles-pp.init_multi_vma_prep
> 1.05 � 3% -0.1 0.95 � 6% -0.1 0.91 � 6% perf-profile.children.cycles-pp.security_vm_enough_memory_mm
> 0.75 � 7% -0.1 0.68 � 10% -0.1 0.64 � 10% perf-profile.children.cycles-pp.kthread
> 0.40 � 6% -0.1 0.35 � 9% -0.0 0.38 � 8% perf-profile.children.cycles-pp.syscall_exit_to_user_mode_prepare
> 0.35 � 2% -0.0 0.33 � 7% -0.0 0.31 � 6% perf-profile.children.cycles-pp.brk_test
> 0.11 � 20% +0.0 0.14 � 8% +0.0 0.13 � 6% perf-profile.children.cycles-pp.anon_vma_interval_tree_remove
> 0.52 � 3% +0.0 0.56 � 4% +0.0 0.54 � 10% perf-profile.children.cycles-pp.mas_wr_slot_store
> 0.20 � 11% +0.1 0.28 � 7% +0.1 0.31 � 5% perf-profile.children.cycles-pp.rb_next
> 0.49 � 3% +0.1 0.61 � 4% +0.2 0.64 � 7% perf-profile.children.cycles-pp.mas_wr_store_entry
> 0.98 � 4% +0.1 1.11 � 3% +0.1 1.11 � 4% perf-profile.children.cycles-pp.rcu_all_qs
> 0.39 � 7% +0.2 0.55 � 7% +0.2 0.60 � 6% perf-profile.children.cycles-pp.strnlen
> 1.18 � 5% +0.2 1.37 � 3% +0.2 1.36 � 2% perf-profile.children.cycles-pp.sized_strscpy
> 1.78 � 3% +0.3 2.04 � 2% +0.2 2.02 � 3% perf-profile.children.cycles-pp.__cond_resched
> 0.00 +0.3 0.33 � 4% +0.3 0.31 � 10% perf-profile.children.cycles-pp.mas_next_setup
> 0.41 � 9% +0.4 0.76 � 7% +0.4 0.80 � 6% perf-profile.children.cycles-pp.percpu_counter_add_batch
> 0.58 � 4% +0.4 0.96 � 2% +0.4 1.01 � 6% perf-profile.children.cycles-pp.__anon_vma_interval_tree_remove
> 0.44 � 17% +0.4 0.85 � 7% +0.4 0.80 � 5% perf-profile.children.cycles-pp.mas_prev_setup
> 4.11 � 2% +0.4 4.52 +0.5 4.58 perf-profile.children.cycles-pp.down_write
> 0.74 � 6% +0.6 1.29 � 5% +0.6 1.32 � 3% perf-profile.children.cycles-pp.__vm_enough_memory
> 0.00 +0.7 0.67 � 6% +0.6 0.63 � 7% perf-profile.children.cycles-pp.mas_next_range
> 0.95 � 5% +0.7 1.64 � 2% +0.9 1.84 � 3% perf-profile.children.cycles-pp.mas_next_slot
> 78.23 +0.9 79.17 +0.8 79.07 perf-profile.children.cycles-pp.__do_sys_brk
> 1.02 � 14% +1.0 1.99 � 4% +0.8 1.86 � 6% perf-profile.children.cycles-pp.mas_prev
> 2.89 � 3% +1.2 4.10 +1.3 4.19 � 2% perf-profile.children.cycles-pp.vma_prepare
> 1.38 � 12% +1.3 2.73 � 4% +1.3 2.73 � 3% perf-profile.children.cycles-pp.mas_prev_slot
> 53.08 +1.9 55.03 +1.9 54.96 perf-profile.children.cycles-pp.do_brk_flags
> 0.00 +28.0 27.95 +28.2 28.20 perf-profile.children.cycles-pp.vma_expand
> 0.00 +32.1 32.10 +32.3 32.32 perf-profile.children.cycles-pp.vma_merge_new_range
> 5.69 -3.4 2.34 � 3% -3.3 2.36 � 3% perf-profile.self.cycles-pp.do_brk_flags
> 5.22 -0.9 4.33 � 2% -0.9 4.33 � 3% perf-profile.self.cycles-pp.up_write
> 3.82 -0.9 2.95 � 3% -0.7 3.09 perf-profile.self.cycles-pp.mas_wr_store_type
> 9.68 � 2% -0.6 9.05 -1.0 8.73 perf-profile.self.cycles-pp.perf_event_mmap_output
> 1.28 � 5% -0.6 0.69 � 6% -0.5 0.75 � 5% perf-profile.self.cycles-pp.can_vma_merge_after
> 2.88 � 3% -0.4 2.44 � 2% -0.2 2.65 � 2% perf-profile.self.cycles-pp.mas_store_prealloc
> 2.55 -0.3 2.22 � 2% -0.3 2.22 � 4% perf-profile.self.cycles-pp.mas_preallocate
> 4.98 � 2% -0.3 4.70 -0.2 4.76 perf-profile.self.cycles-pp.__do_sys_brk
> 2.15 � 3% -0.2 1.93 � 3% -0.2 1.98 � 3% perf-profile.self.cycles-pp.mas_leaf_max_gap
> 1.82 -0.2 1.60 � 4% -0.2 1.62 � 3% perf-profile.self.cycles-pp.perf_event_mmap_event
> 1.51 � 4% -0.2 1.31 � 4% -0.3 1.26 perf-profile.self.cycles-pp.perf_event_mmap
> 1.85 � 2% -0.2 1.66 � 3% -0.2 1.61 � 3% perf-profile.self.cycles-pp.init_multi_vma_prep
> 2.77 -0.1 2.63 � 3% -0.2 2.60 � 3% perf-profile.self.cycles-pp.userfaultfd_unmap_complete
> 0.75 � 5% -0.1 0.67 � 4% -0.1 0.65 � 5% perf-profile.self.cycles-pp.security_vm_enough_memory_mm
> 0.88 � 2% -0.0 0.85 � 3% -0.1 0.82 � 4% perf-profile.self.cycles-pp.entry_SYSCALL_64_after_hwframe
> 0.28 � 5% -0.0 0.26 � 8% -0.0 0.24 � 8% perf-profile.self.cycles-pp.brk_test
> 0.03 � 70% +0.0 0.07 � 14% +0.0 0.07 � 8% perf-profile.self.cycles-pp.anon_vma_interval_tree_remove
> 0.15 � 12% +0.1 0.20 � 5% +0.1 0.24 � 6% perf-profile.self.cycles-pp.rb_next
> 0.40 � 5% +0.1 0.48 � 5% +0.1 0.50 � 10% perf-profile.self.cycles-pp.mas_wr_store_entry
> 0.34 � 6% +0.2 0.50 � 8% +0.2 0.54 � 4% perf-profile.self.cycles-pp.strnlen
> 0.66 � 4% +0.2 0.84 � 5% +0.1 0.80 � 4% perf-profile.self.cycles-pp.vma_prepare
> 1.12 � 5% +0.2 1.30 � 3% +0.2 1.28 � 2% perf-profile.self.cycles-pp.sized_strscpy
> 3.00 � 2% +0.2 3.19 � 2% +0.3 3.27 � 2% perf-profile.self.cycles-pp.down_write
> 0.92 � 4% +0.2 1.13 � 2% +0.2 1.08 � 3% perf-profile.self.cycles-pp.__cond_resched
> 0.00 +0.3 0.26 � 7% +0.3 0.25 � 12% perf-profile.self.cycles-pp.mas_next_setup
> 0.28 � 8% +0.3 0.54 � 8% +0.3 0.56 � 6% perf-profile.self.cycles-pp.percpu_counter_add_batch
> 0.29 � 12% +0.3 0.58 � 9% +0.3 0.60 � 4% perf-profile.self.cycles-pp.__vm_enough_memory
> 0.29 � 24% +0.3 0.58 � 7% +0.2 0.54 � 7% perf-profile.self.cycles-pp.mas_prev_setup
> 0.40 � 4% +0.3 0.70 � 2% +0.3 0.72 � 8% perf-profile.self.cycles-pp.__anon_vma_interval_tree_remove
> 0.00 +0.4 0.36 � 6% +0.3 0.28 � 12% perf-profile.self.cycles-pp.mas_next_range
> 0.58 � 14% +0.5 1.12 � 5% +0.5 1.10 � 6% perf-profile.self.cycles-pp.mas_prev
> 0.81 � 4% +0.7 1.48 � 3% +0.8 1.64 � 4% perf-profile.self.cycles-pp.mas_next_slot
> 1.32 � 11% +1.3 2.59 � 3% +1.3 2.60 � 3% perf-profile.self.cycles-pp.mas_prev_slot
> 0.00 +1.3 1.30 � 4% +1.1 1.14 � 6% perf-profile.self.cycles-pp.vma_merge_new_range
> 0.00 +3.4 3.39 +3.4 3.36 perf-profile.self.cycles-pp.vma_expand
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/testtime:
> gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-spr-2sp4/brk_test/aim9/300s
>
> commit:
> fc21959f74bc11 ("mm: abstract vma_expand() to use vma_merge_struct")
> cacded5e42b960 ("mm: avoid using vma_merge() for new VMAs")
> 2e71337ac26478 ("mm: explicitly enable an expand-only merge mode for brk()")
>
> fc21959f74bc1138 cacded5e42b9609b07b22d80c10 2e71337ac2647889d3d9d76a5ce
> ---------------- --------------------------- ---------------------------
> %stddev %change %stddev %change %stddev
> \ | \ | \
> 3540976 -6.4% 3314159 -6.7% 3302864 aim9.brk_test.ops_per_sec
> 23.65 -5.8% 22.28 -6.5% 22.10 time.user_time
> 568.02 � 10% -0.2% 567.09 � 12% +18.0% 670.52 � 8% sched_debug.cfs_rq:/.avg_vruntime.min
> 568.02 � 10% -0.2% 567.09 � 12% +18.0% 670.52 � 8% sched_debug.cfs_rq:/.min_vruntime.min
> 111409 � 2% -5.1% 105748 � 3% -4.9% 105984 � 2% proc-vmstat.nr_active_anon
> 114711 � 2% -5.0% 109006 � 3% -4.7% 109341 � 2% proc-vmstat.nr_shmem
> 111409 � 2% -5.1% 105748 � 3% -4.9% 105984 � 2% proc-vmstat.nr_zone_active_anon
> 17422 � 2% -5.3% 16494 -1.9% 17084 � 2% proc-vmstat.pgactivate
> 1.999e+09 +3.2% 2.064e+09 +2.9% 2.057e+09 perf-stat.i.branch-instructions
> 0.47 -5.1% 0.44 -4.4% 0.45 perf-stat.i.cpi
> 9.452e+09 +5.6% 9.983e+09 +5.3% 9.951e+09 perf-stat.i.instructions
> 2.19 +5.8% 2.31 +5.2% 2.30 perf-stat.i.ipc
> 0.33 � 3% -0.0 0.31 -0.0 0.32 perf-stat.overall.branch-miss-rate%
> 0.47 -5.1% 0.45 -4.4% 0.45 perf-stat.overall.cpi
> 2.12 +5.4% 2.23 +4.7% 2.21 perf-stat.overall.ipc
> 1.991e+09 +3.2% 2.056e+09 +2.9% 2.05e+09 perf-stat.ps.branch-instructions
> 9.417e+09 +5.6% 9.946e+09 +5.3% 9.915e+09 perf-stat.ps.instructions
> 2.841e+12 +5.7% 3.002e+12 +5.2% 2.988e+12 perf-stat.total.instructions
> 0.01 � 42% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.02 � 37% -68.5% 0.01 � 44% -57.7% 0.01 � 63% perf-sched.sch_delay.avg.ms.__cond_resched.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.02 � 38% +31.7% 0.02 � 21% +53.8% 0.03 � 10% perf-sched.sch_delay.avg.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown]
> 0.04 � 66% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.05 � 47% -75.3% 0.01 � 83% -69.2% 0.01 � 74% perf-sched.sch_delay.max.ms.__cond_resched.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.01 � 9% +33.8% 0.02 � 18% +17.5% 0.02 � 10% perf-sched.sch_delay.max.ms.__x64_sys_pause.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown]
> 0.44 � 49% -29.7% 0.31 � 35% +145.0% 1.09 � 41% perf-sched.sch_delay.max.ms.pipe_read.vfs_read.ksys_read.do_syscall_64
> 0.08 � 57% -69.7% 0.02 �146% +6.7% 0.09 � 66% perf-sched.sch_delay.max.ms.schedule_timeout.__wait_for_common.wait_for_completion_state.kernel_clone
> 0.10 � 37% +45.2% 0.15 � 8% +20.5% 0.12 � 13% perf-sched.sch_delay.max.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown]
> 7209 � 3% -7.8% 6648 � 2% -3.6% 6948 � 3% perf-sched.total_wait_and_delay.count.ms
> 1533 � 6% -10.2% 1377 -2.6% 1493 � 7% perf-sched.wait_and_delay.count.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> 0.01 � 42% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.02 � 37% -68.5% 0.01 � 44% -57.7% 0.01 � 63% perf-sched.wait_time.avg.ms.__cond_resched.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.04 � 66% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.05 � 47% -75.3% 0.01 � 83% -69.2% 0.01 � 74% perf-sched.wait_time.max.ms.__cond_resched.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 6.61 -6.6 0.00 -6.6 0.00 perf-profile.calltrace.cycles-pp.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 6.20 -6.2 0.00 -6.2 0.00 perf-profile.calltrace.cycles-pp.mas_preallocate.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 17.96 -1.1 16.87 -1.5 16.43 perf-profile.calltrace.cycles-pp.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 16.08 -1.0 15.10 -1.3 14.78 perf-profile.calltrace.cycles-pp.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64
> 9.85 -0.8 9.02 -1.2 8.66 perf-profile.calltrace.cycles-pp.perf_event_mmap_output.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags
> 11.56 -0.8 10.73 -1.2 10.33 � 2% perf-profile.calltrace.cycles-pp.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 5.32 -0.2 5.10 � 5% -0.3 5.03 perf-profile.calltrace.cycles-pp.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 3.57 � 2% -0.1 3.43 � 3% -0.2 3.40 � 3% perf-profile.calltrace.cycles-pp.thp_get_unmapped_area_vmflags.__get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64
> 4.87 -0.1 4.74 � 4% -0.2 4.66 � 2% perf-profile.calltrace.cycles-pp.__get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 2.76 � 2% -0.1 2.66 � 3% -0.2 2.58 � 3% perf-profile.calltrace.cycles-pp.userfaultfd_unmap_complete.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 1.11 � 15% -0.1 1.04 � 4% -0.1 0.96 � 5% perf-profile.calltrace.cycles-pp.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry
> 0.64 � 4% +0.4 1.06 � 2% +0.4 1.06 � 5% perf-profile.calltrace.cycles-pp.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.6 0.56 � 5% +0.6 0.56 � 4% perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +0.6 0.57 � 6% +0.5 0.47 � 46% perf-profile.calltrace.cycles-pp.mas_wr_slot_store.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +0.6 0.58 � 7% +0.6 0.58 � 3% perf-profile.calltrace.cycles-pp.mas_next_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.7 0.69 � 4% +0.7 0.71 � 5% perf-profile.calltrace.cycles-pp.percpu_counter_add_batch.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.7 0.70 � 6% +0.8 0.78 � 6% perf-profile.calltrace.cycles-pp.mas_next_slot.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.7 0.73 � 8% +0.7 0.74 � 8% perf-profile.calltrace.cycles-pp.vma_adjust_trans_huge.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +0.7 0.74 � 5% +0.7 0.74 � 7% perf-profile.calltrace.cycles-pp.can_vma_merge_after.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.8 0.84 � 2% +0.7 0.70 � 4% perf-profile.calltrace.cycles-pp.mas_prev.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +0.9 0.88 � 5% +0.9 0.86 � 3% perf-profile.calltrace.cycles-pp.__anon_vma_interval_tree_remove.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 78.92 +0.9 79.81 +0.5 79.46 perf-profile.calltrace.cycles-pp.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +1.3 1.28 � 2% +1.3 1.30 � 5% perf-profile.calltrace.cycles-pp.mas_prev_slot.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +1.4 1.42 � 3% +1.4 1.36 � 3% perf-profile.calltrace.cycles-pp.up_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.6 1.59 � 4% +1.6 1.64 � 3% perf-profile.calltrace.cycles-pp.up_write.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +1.8 1.80 � 4% +1.7 1.73 � 2% perf-profile.calltrace.cycles-pp.init_multi_vma_prep.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.9 1.89 � 4% +1.9 1.90 � 5% perf-profile.calltrace.cycles-pp.mas_leaf_max_gap.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range
> 0.00 +2.1 2.06 � 3% +2.2 2.17 � 2% perf-profile.calltrace.cycles-pp.down_write.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +2.1 2.12 � 2% +2.1 2.14 � 2% perf-profile.calltrace.cycles-pp.down_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +2.4 2.43 � 4% +2.4 2.40 � 4% perf-profile.calltrace.cycles-pp.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 52.76 +2.6 55.40 +2.7 55.48 perf-profile.calltrace.cycles-pp.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +3.0 2.98 +3.4 3.38 � 2% perf-profile.calltrace.cycles-pp.mas_wr_store_type.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +3.1 3.11 � 3% +3.2 3.18 � 5% perf-profile.calltrace.cycles-pp.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +3.9 3.90 � 2% +4.0 4.00 � 2% perf-profile.calltrace.cycles-pp.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +5.0 4.96 +5.4 5.39 perf-profile.calltrace.cycles-pp.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +6.0 6.04 � 2% +6.2 6.15 perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +27.5 27.47 +28.1 28.06 perf-profile.calltrace.cycles-pp.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +32.1 32.09 +32.7 32.73 perf-profile.calltrace.cycles-pp.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 6.44 -1.2 5.20 -0.8 5.64 perf-profile.children.cycles-pp.mas_preallocate
> 18.11 -1.1 16.99 -1.6 16.55 perf-profile.children.cycles-pp.perf_event_mmap
> 4.01 � 2% -1.0 3.06 -0.6 3.45 � 2% perf-profile.children.cycles-pp.mas_wr_store_type
> 16.54 -0.9 15.60 -1.3 15.27 perf-profile.children.cycles-pp.perf_event_mmap_event
> 10.02 -0.8 9.18 -1.2 8.80 perf-profile.children.cycles-pp.perf_event_mmap_output
> 5.61 -0.8 4.77 -0.8 4.80 � 2% perf-profile.children.cycles-pp.up_write
> 11.80 -0.8 10.97 -1.2 10.57 � 2% perf-profile.children.cycles-pp.perf_iterate_sb
> 1.39 -0.6 0.81 � 3% -0.6 0.81 � 6% perf-profile.children.cycles-pp.can_vma_merge_after
> 6.89 -0.5 6.38 -0.4 6.52 perf-profile.children.cycles-pp.mas_store_prealloc
> 3.67 � 2% -0.3 3.41 � 3% -0.2 3.48 � 5% perf-profile.children.cycles-pp.vma_complete
> 5.55 -0.2 5.32 � 4% -0.3 5.23 perf-profile.children.cycles-pp.check_brk_limits
> 2.20 � 4% -0.2 1.97 � 3% -0.2 1.96 � 4% perf-profile.children.cycles-pp.mas_leaf_max_gap
> 2.68 � 3% -0.2 2.47 � 3% -0.2 2.44 � 4% perf-profile.children.cycles-pp.mas_update_gap
> 5.11 -0.2 4.91 � 4% -0.3 4.84 � 2% perf-profile.children.cycles-pp.__get_unmapped_area
> 2.51 � 3% -0.1 2.36 � 3% -0.2 2.32 � 2% perf-profile.children.cycles-pp.down_write_killable
> 0.61 � 5% -0.1 0.49 � 7% -0.1 0.50 � 5% perf-profile.children.cycles-pp.may_expand_vm
> 3.67 -0.1 3.55 � 3% -0.2 3.51 � 3% perf-profile.children.cycles-pp.thp_get_unmapped_area_vmflags
> 1.25 � 4% -0.1 1.14 � 5% -0.1 1.19 � 4% perf-profile.children.cycles-pp.syscall_exit_to_user_mode
> 2.85 � 2% -0.1 2.74 � 2% -0.2 2.66 � 3% perf-profile.children.cycles-pp.userfaultfd_unmap_complete
> 0.14 � 11% -0.1 0.08 � 12% -0.1 0.06 � 14% perf-profile.children.cycles-pp.arch_vma_name
> 0.42 -0.1 0.36 � 4% -0.0 0.40 � 3% perf-profile.children.cycles-pp.syscall_exit_to_user_mode_prepare
> 0.36 � 6% -0.1 0.31 � 4% -0.0 0.34 � 11% perf-profile.children.cycles-pp.brk_test
> 2.39 -0.1 2.34 � 5% -0.1 2.29 perf-profile.children.cycles-pp.arch_get_unmapped_area_topdown_vmflags
> 0.25 � 5% -0.0 0.21 � 9% -0.0 0.23 � 13% perf-profile.children.cycles-pp.__rb_insert_augmented
> 1.92 � 2% -0.0 1.89 � 4% -0.1 1.80 � 2% perf-profile.children.cycles-pp.init_multi_vma_prep
> 0.31 � 10% -0.0 0.29 � 10% -0.0 0.26 � 9% perf-profile.children.cycles-pp.sched_setaffinity
> 0.14 � 3% -0.0 0.14 � 7% -0.0 0.11 � 8% perf-profile.children.cycles-pp.intel_idle
> 0.08 � 10% +0.0 0.12 � 16% +0.0 0.10 � 9% perf-profile.children.cycles-pp.mmap_region
> 0.09 � 8% +0.0 0.12 � 15% +0.0 0.11 � 8% perf-profile.children.cycles-pp.do_mmap
> 0.10 � 14% +0.0 0.15 � 11% +0.0 0.14 � 13% perf-profile.children.cycles-pp.anon_vma_interval_tree_remove
> 1.01 � 5% +0.1 1.08 � 5% +0.1 1.12 perf-profile.children.cycles-pp.rcu_all_qs
> 0.19 � 5% +0.1 0.30 � 5% +0.1 0.28 � 8% perf-profile.children.cycles-pp.rb_next
> 1.27 � 4% +0.1 1.40 � 2% +0.1 1.37 � 5% perf-profile.children.cycles-pp.sized_strscpy
> 0.42 � 6% +0.1 0.57 � 6% +0.2 0.63 � 9% perf-profile.children.cycles-pp.strnlen
> 0.48 � 4% +0.2 0.64 � 5% +0.2 0.65 � 5% perf-profile.children.cycles-pp.mas_wr_store_entry
> 1.80 � 4% +0.2 2.02 � 2% +0.2 2.00 perf-profile.children.cycles-pp.__cond_resched
> 0.00 +0.3 0.31 � 12% +0.3 0.32 � 3% perf-profile.children.cycles-pp.mas_next_setup
> 4.16 � 3% +0.3 4.48 +0.5 4.64 � 3% perf-profile.children.cycles-pp.down_write
> 0.40 � 6% +0.4 0.78 � 4% +0.4 0.79 � 3% perf-profile.children.cycles-pp.percpu_counter_add_batch
> 0.48 � 4% +0.4 0.92 � 5% +0.4 0.90 � 3% perf-profile.children.cycles-pp.mas_prev_setup
> 0.56 � 6% +0.5 1.02 � 4% +0.5 1.01 � 4% perf-profile.children.cycles-pp.__anon_vma_interval_tree_remove
> 0.79 � 4% +0.5 1.30 � 3% +0.5 1.30 � 4% perf-profile.children.cycles-pp.__vm_enough_memory
> 1.02 � 2% +0.7 1.72 � 3% +0.8 1.79 � 4% perf-profile.children.cycles-pp.mas_next_slot
> 0.00 +0.7 0.70 � 6% +0.7 0.68 � 4% perf-profile.children.cycles-pp.mas_next_range
> 79.62 +0.9 80.50 +0.5 80.13 perf-profile.children.cycles-pp.__do_sys_brk
> 1.10 � 3% +1.0 2.10 � 3% +0.8 1.94 � 3% perf-profile.children.cycles-pp.mas_prev
> 2.86 � 3% +1.3 4.12 � 3% +1.4 4.25 perf-profile.children.cycles-pp.vma_prepare
> 1.45 � 4% +1.3 2.79 � 3% +1.3 2.77 � 3% perf-profile.children.cycles-pp.mas_prev_slot
> 54.06 +1.8 55.82 +1.9 55.95 perf-profile.children.cycles-pp.do_brk_flags
> 0.00 +28.3 28.30 +28.9 28.88 perf-profile.children.cycles-pp.vma_expand
> 0.00 +32.6 32.58 +33.1 33.05 perf-profile.children.cycles-pp.vma_merge_new_range
> 5.90 � 2% -3.4 2.47 � 3% -3.4 2.47 � 2% perf-profile.self.cycles-pp.do_brk_flags
> 3.84 � 2% -0.9 2.90 -0.6 3.28 � 3% perf-profile.self.cycles-pp.mas_wr_store_type
> 9.85 -0.8 9.02 -1.2 8.63 perf-profile.self.cycles-pp.perf_event_mmap_output
> 5.26 -0.8 4.47 � 2% -0.8 4.49 � 2% perf-profile.self.cycles-pp.up_write
> 1.34 � 2% -0.6 0.75 � 3% -0.6 0.74 � 5% perf-profile.self.cycles-pp.can_vma_merge_after
> 2.86 -0.4 2.47 � 5% -0.2 2.70 � 2% perf-profile.self.cycles-pp.mas_store_prealloc
> 2.50 � 2% -0.3 2.22 � 2% -0.2 2.27 � 2% perf-profile.self.cycles-pp.mas_preallocate
> 5.02 � 2% -0.2 4.79 -0.3 4.69 perf-profile.self.cycles-pp.__do_sys_brk
> 2.19 � 4% -0.2 1.96 � 3% -0.2 1.95 � 4% perf-profile.self.cycles-pp.mas_leaf_max_gap
> 1.87 � 3% -0.2 1.66 � 4% -0.2 1.71 � 6% perf-profile.self.cycles-pp.perf_event_mmap_event
> 1.52 � 3% -0.2 1.33 � 2% -0.3 1.24 � 2% perf-profile.self.cycles-pp.perf_event_mmap
> 1.82 � 3% -0.1 1.68 � 4% -0.2 1.66 � 3% perf-profile.self.cycles-pp.down_write_killable
> 1.84 � 2% -0.1 1.74 � 4% -0.2 1.67 � 2% perf-profile.self.cycles-pp.init_multi_vma_prep
> 2.77 � 2% -0.1 2.67 � 2% -0.2 2.58 � 3% perf-profile.self.cycles-pp.userfaultfd_unmap_complete
> 1.18 � 2% -0.1 1.09 -0.1 1.11 � 6% perf-profile.self.cycles-pp.do_syscall_64
> 0.92 � 3% -0.1 0.84 � 6% -0.1 0.82 � 5% perf-profile.self.cycles-pp.__get_unmapped_area
> 2.30 -0.0 2.26 � 5% -0.1 2.21 perf-profile.self.cycles-pp.arch_get_unmapped_area_topdown_vmflags
> 0.33 � 4% -0.0 0.30 � 5% -0.0 0.33 � 6% perf-profile.self.cycles-pp.syscall_exit_to_user_mode_prepare
> 1.08 � 2% -0.0 1.05 � 4% -0.1 1.00 � 2% perf-profile.self.cycles-pp.mas_find
> 0.14 � 3% -0.0 0.14 � 7% -0.0 0.11 � 8% perf-profile.self.cycles-pp.intel_idle
> 0.03 � 70% +0.1 0.08 � 14% +0.0 0.07 � 15% perf-profile.self.cycles-pp.anon_vma_interval_tree_remove
> 0.13 � 7% +0.1 0.22 � 10% +0.1 0.22 � 11% perf-profile.self.cycles-pp.rb_next
> 0.40 � 7% +0.1 0.50 � 9% +0.1 0.51 � 6% perf-profile.self.cycles-pp.mas_wr_store_entry
> 1.21 � 4% +0.1 1.32 � 2% +0.1 1.30 � 5% perf-profile.self.cycles-pp.sized_strscpy
> 0.38 � 7% +0.1 0.50 � 7% +0.2 0.57 � 9% perf-profile.self.cycles-pp.strnlen
> 0.95 � 7% +0.1 1.10 � 4% +0.1 1.08 perf-profile.self.cycles-pp.__cond_resched
> 0.63 � 5% +0.2 0.82 � 9% +0.2 0.83 � 2% perf-profile.self.cycles-pp.vma_prepare
> 2.98 � 2% +0.2 3.20 +0.3 3.32 � 4% perf-profile.self.cycles-pp.down_write
> 0.37 � 6% +0.2 0.60 � 6% +0.2 0.58 � 4% perf-profile.self.cycles-pp.__vm_enough_memory
> 0.00 +0.2 0.24 � 11% +0.2 0.24 � 5% perf-profile.self.cycles-pp.mas_next_setup
> 0.24 � 6% +0.3 0.54 � 6% +0.3 0.56 � 4% perf-profile.self.cycles-pp.percpu_counter_add_batch
> 0.32 � 4% +0.3 0.64 � 5% +0.3 0.62 � 3% perf-profile.self.cycles-pp.mas_prev_setup
> 0.38 � 10% +0.3 0.72 � 6% +0.3 0.73 � 6% perf-profile.self.cycles-pp.__anon_vma_interval_tree_remove
> 0.00 +0.4 0.41 � 5% +0.3 0.33 � 9% perf-profile.self.cycles-pp.mas_next_range
> 0.63 � 5% +0.5 1.17 � 3% +0.5 1.10 � 5% perf-profile.self.cycles-pp.mas_prev
> 0.87 � 3% +0.6 1.49 � 3% +0.7 1.61 � 6% perf-profile.self.cycles-pp.mas_next_slot
> 1.37 � 4% +1.3 2.64 � 3% +1.3 2.62 � 4% perf-profile.self.cycles-pp.mas_prev_slot
> 0.00 +1.3 1.30 +1.2 1.19 � 4% perf-profile.self.cycles-pp.vma_merge_new_range
> 0.00 +3.4 3.45 � 2% +3.4 3.43 � 2% perf-profile.self.cycles-pp.vma_expand
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/testtime:
> gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-icl-2sp9/brk_test/aim9/300s
>
> commit:
> fc21959f74bc11 ("mm: abstract vma_expand() to use vma_merge_struct")
> cacded5e42b960 ("mm: avoid using vma_merge() for new VMAs")
> 2e71337ac26478 ("mm: explicitly enable an expand-only merge mode for brk()")
>
> fc21959f74bc1138 cacded5e42b9609b07b22d80c10 2e71337ac2647889d3d9d76a5ce
> ---------------- --------------------------- ---------------------------
> %stddev %change %stddev %change %stddev
> \ | \ | \
> 2667734 -5.6% 2518021 -6.2% 2503505 aim9.brk_test.ops_per_sec
> 196.00 +0.0% 196.00 +1038.8% 2231 � 89% meminfo.Inactive(file)
> 23.94 -8.7% 21.86 � 2% -6.0% 22.51 time.user_time
> 0.01 � 47% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.06 � 34% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.01 � 47% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.06 � 34% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 49.00 +0.0% 49.00 +1039.3% 558.24 � 89% proc-vmstat.nr_inactive_file
> 49.00 +0.0% 49.00 +1039.3% 558.24 � 89% proc-vmstat.nr_zone_inactive_file
> 948658 +2.3% 970280 +3.2% 978780 proc-vmstat.pgalloc_normal
> 792310 -1.5% 780779 -1.7% 779104 proc-vmstat.pgfault
> 814343 +2.4% 833987 +3.0% 839063 proc-vmstat.pgfree
> 1.721e+09 +3.0% 1.773e+09 +2.6% 1.765e+09 perf-stat.i.branch-instructions
> 0.54 -5.4% 0.52 -4.8% 0.52 perf-stat.i.cpi
> 7.553e+09 +6.0% 8.003e+09 +5.5% 7.968e+09 perf-stat.i.instructions
> 1.86 +6.1% 1.97 +5.3% 1.96 perf-stat.i.ipc
> 2399 -1.1% 2372 -1.3% 2367 perf-stat.i.minor-faults
> 2399 -1.1% 2372 -1.3% 2367 perf-stat.i.page-faults
> 0.36 � 2% -0.0 0.35 +0.0 0.36 perf-stat.overall.branch-miss-rate%
> 0.55 -5.3% 0.52 -4.6% 0.52 perf-stat.overall.cpi
> 1.82 +5.6% 1.92 +4.8% 1.91 perf-stat.overall.ipc
> 1.715e+09 +3.0% 1.767e+09 +2.6% 1.76e+09 perf-stat.ps.branch-instructions
> 7.529e+09 +5.9% 7.977e+09 +5.5% 7.942e+09 perf-stat.ps.instructions
> 2391 -1.1% 2364 -1.3% 2359 perf-stat.ps.minor-faults
> 2391 -1.1% 2364 -1.3% 2359 perf-stat.ps.page-faults
> 2.275e+12 +5.8% 2.408e+12 +5.3% 2.395e+12 perf-stat.total.instructions
> 6.58 � 2% -6.6 0.00 -6.6 0.00 perf-profile.calltrace.cycles-pp.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 5.76 � 2% -5.8 0.00 -5.8 0.00 perf-profile.calltrace.cycles-pp.mas_preallocate.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 18.35 -1.3 17.10 -1.0 17.32 perf-profile.calltrace.cycles-pp.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 15.92 -1.1 14.78 � 2% -0.9 15.03 perf-profile.calltrace.cycles-pp.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64
> 11.03 -0.7 10.33 -0.7 10.36 perf-profile.calltrace.cycles-pp.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 4.22 � 3% -0.4 3.79 � 2% -0.5 3.69 perf-profile.calltrace.cycles-pp.mas_walk.mas_find.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 8.48 -0.4 8.08 � 2% -0.5 7.95 perf-profile.calltrace.cycles-pp.perf_event_mmap_output.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags
> 5.32 -0.3 4.98 -0.2 5.10 � 3% perf-profile.calltrace.cycles-pp.clear_bhb_loop.brk
> 5.38 � 3% -0.3 5.06 -0.5 4.89 perf-profile.calltrace.cycles-pp.mas_find.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 1.16 � 7% -0.3 0.86 � 5% -0.3 0.90 � 5% perf-profile.calltrace.cycles-pp.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.88 � 14% -0.2 0.64 � 8% -0.2 0.64 � 4% perf-profile.calltrace.cycles-pp.security_vm_enough_memory_mm.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 5.56 -0.2 5.38 -0.2 5.34 perf-profile.calltrace.cycles-pp.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.74 � 6% -0.2 0.57 � 6% -0.1 0.62 � 7% perf-profile.calltrace.cycles-pp.percpu_counter_add_batch.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64
> 5.09 -0.2 4.92 -0.2 4.90 perf-profile.calltrace.cycles-pp.__get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 3.73 -0.2 3.56 � 2% -0.2 3.58 � 2% perf-profile.calltrace.cycles-pp.thp_get_unmapped_area_vmflags.__get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64
> 1.25 � 2% -0.2 1.08 � 9% -0.1 1.13 � 4% perf-profile.calltrace.cycles-pp.sized_strscpy.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> 1.98 � 2% -0.1 1.84 � 3% -0.1 1.88 � 2% perf-profile.calltrace.cycles-pp.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.55 � 2% -0.1 0.42 � 44% -0.1 0.46 � 44% perf-profile.calltrace.cycles-pp.__cond_resched.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.78 � 3% -0.1 0.72 � 4% -0.1 0.72 � 3% perf-profile.calltrace.cycles-pp.mas_prev.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.6 0.56 � 5% +0.1 0.09 �223% perf-profile.calltrace.cycles-pp.anon_vma_interval_tree_insert.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +0.6 0.64 +0.6 0.60 � 7% perf-profile.calltrace.cycles-pp.vma_adjust_trans_huge.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +0.7 0.69 � 8% +0.7 0.70 � 8% perf-profile.calltrace.cycles-pp.__anon_vma_interval_tree_remove.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +0.8 0.78 � 4% +0.9 0.88 � 5% perf-profile.calltrace.cycles-pp.mas_next_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.8 0.80 � 2% +0.7 0.72 � 3% perf-profile.calltrace.cycles-pp.mas_prev.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 82.26 +0.8 83.07 +0.7 82.95 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.8 0.82 � 4% +0.8 0.80 � 5% perf-profile.calltrace.cycles-pp.can_vma_merge_after.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 81.38 +0.8 82.20 +0.7 82.07 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.8 0.84 � 4% +0.8 0.80 � 7% perf-profile.calltrace.cycles-pp.mas_wr_slot_store.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 77.94 +1.0 78.92 +0.8 78.74 perf-profile.calltrace.cycles-pp.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +1.2 1.24 � 3% +1.2 1.18 � 4% perf-profile.calltrace.cycles-pp.mas_prev_slot.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +1.3 1.32 � 2% +1.4 1.37 � 3% perf-profile.calltrace.cycles-pp.mas_next_slot.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +1.4 1.38 � 2% +1.4 1.42 � 4% perf-profile.calltrace.cycles-pp.down_write.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +1.4 1.40 � 4% +1.4 1.38 perf-profile.calltrace.cycles-pp.up_write.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +1.6 1.64 +1.7 1.66 � 3% perf-profile.calltrace.cycles-pp.up_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.8 1.82 � 5% +1.7 1.73 � 3% perf-profile.calltrace.cycles-pp.down_write.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.9 1.89 � 3% +1.9 1.89 � 2% perf-profile.calltrace.cycles-pp.init_multi_vma_prep.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.9 1.92 � 3% +1.9 1.91 perf-profile.calltrace.cycles-pp.mas_leaf_max_gap.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range
> 0.00 +2.3 2.31 +2.3 2.31 � 3% perf-profile.calltrace.cycles-pp.mas_wr_store_type.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +2.7 2.68 � 2% +2.6 2.62 perf-profile.calltrace.cycles-pp.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +2.9 2.92 � 4% +2.8 2.81 perf-profile.calltrace.cycles-pp.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +2.9 2.93 � 2% +2.9 2.94 � 3% perf-profile.calltrace.cycles-pp.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 53.19 +3.0 56.14 +2.6 55.83 perf-profile.calltrace.cycles-pp.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +4.4 4.42 +4.4 4.40 perf-profile.calltrace.cycles-pp.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +7.1 7.09 +7.0 6.95 perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +26.8 26.83 +26.3 26.31 perf-profile.calltrace.cycles-pp.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +31.4 31.41 +30.8 30.83 perf-profile.calltrace.cycles-pp.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 5.93 -1.3 4.62 -1.3 4.60 perf-profile.children.cycles-pp.mas_preallocate
> 18.48 -1.3 17.23 -1.0 17.46 perf-profile.children.cycles-pp.perf_event_mmap
> 16.41 -1.2 15.23 -0.9 15.47 perf-profile.children.cycles-pp.perf_event_mmap_event
> 3.46 -1.1 2.37 -1.1 2.38 � 3% perf-profile.children.cycles-pp.mas_wr_store_type
> 11.24 -0.7 10.52 � 2% -0.7 10.56 perf-profile.children.cycles-pp.perf_iterate_sb
> 4.29 � 3% -0.4 3.86 � 2% -0.5 3.76 perf-profile.children.cycles-pp.mas_walk
> 8.61 -0.4 8.21 � 2% -0.5 8.07 perf-profile.children.cycles-pp.perf_event_mmap_output
> 0.83 � 7% -0.4 0.47 � 8% -0.4 0.45 � 10% perf-profile.children.cycles-pp.may_expand_vm
> 3.82 -0.3 3.48 � 3% -0.4 3.41 perf-profile.children.cycles-pp.down_write
> 5.39 -0.3 5.06 -0.2 5.18 � 3% perf-profile.children.cycles-pp.clear_bhb_loop
> 1.36 � 5% -0.3 1.03 � 5% -0.3 1.08 � 4% perf-profile.children.cycles-pp.__vm_enough_memory
> 5.64 � 3% -0.3 5.32 -0.5 5.13 perf-profile.children.cycles-pp.mas_find
> 1.18 � 5% -0.3 0.88 � 4% -0.3 0.87 � 3% perf-profile.children.cycles-pp.can_vma_merge_after
> 0.57 � 22% -0.2 0.33 � 12% -0.2 0.36 � 7% perf-profile.children.cycles-pp.cap_vm_enough_memory
> 1.06 � 11% -0.2 0.83 � 9% -0.2 0.82 � 5% perf-profile.children.cycles-pp.security_vm_enough_memory_mm
> 5.30 -0.2 5.11 -0.2 5.10 perf-profile.children.cycles-pp.__get_unmapped_area
> 5.75 -0.2 5.56 -0.2 5.52 perf-profile.children.cycles-pp.check_brk_limits
> 0.82 � 4% -0.2 0.64 � 4% -0.1 0.70 � 7% perf-profile.children.cycles-pp.percpu_counter_add_batch
> 3.86 -0.2 3.69 � 2% -0.1 3.71 � 2% perf-profile.children.cycles-pp.thp_get_unmapped_area_vmflags
> 1.32 � 2% -0.2 1.16 � 8% -0.1 1.20 � 3% perf-profile.children.cycles-pp.sized_strscpy
> 2.10 � 2% -0.1 1.96 � 2% -0.1 2.00 � 3% perf-profile.children.cycles-pp.down_write_killable
> 1.86 � 3% -0.1 1.74 � 2% -0.1 1.80 � 4% perf-profile.children.cycles-pp.__cond_resched
> 0.57 � 7% -0.1 0.45 � 13% -0.1 0.46 � 2% perf-profile.children.cycles-pp.strlen
> 2.78 -0.1 2.66 � 2% -0.1 2.64 � 2% perf-profile.children.cycles-pp.arch_get_unmapped_area_topdown_vmflags
> 0.10 � 13% +0.0 0.11 � 16% +0.0 0.12 � 11% perf-profile.children.cycles-pp.vfs_read
> 0.10 � 11% +0.0 0.12 � 13% +0.0 0.14 � 8% perf-profile.children.cycles-pp.read
> 0.70 � 2% +0.1 0.81 � 6% +0.1 0.82 � 7% perf-profile.children.cycles-pp.__anon_vma_interval_tree_remove
> 0.68 � 9% +0.2 0.90 � 3% +0.2 0.86 � 6% perf-profile.children.cycles-pp.mas_wr_slot_store
> 0.34 � 5% +0.3 0.68 � 6% +0.3 0.68 � 4% perf-profile.children.cycles-pp.mas_prev_setup
> 0.00 +0.4 0.43 � 2% +0.4 0.41 � 7% perf-profile.children.cycles-pp.mas_next_setup
> 6.91 � 2% +0.5 7.37 +0.4 7.26 perf-profile.children.cycles-pp.mas_store_prealloc
> 0.92 � 3% +0.8 1.76 � 3% +0.8 1.69 � 2% perf-profile.children.cycles-pp.mas_prev
> 83.20 +0.9 84.05 +0.7 83.90 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe
> 82.36 +0.9 83.23 +0.7 83.08 perf-profile.children.cycles-pp.do_syscall_64
> 78.68 +0.9 79.62 +0.8 79.46 perf-profile.children.cycles-pp.__do_sys_brk
> 0.00 +0.9 0.94 � 3% +1.1 1.05 � 5% perf-profile.children.cycles-pp.mas_next_range
> 1.35 � 5% +1.2 2.59 � 3% +1.2 2.52 perf-profile.children.cycles-pp.mas_prev_slot
> 0.84 � 3% +1.4 2.26 � 3% +1.4 2.27 � 2% perf-profile.children.cycles-pp.mas_next_slot
> 54.26 +2.3 56.54 +2.0 56.30 perf-profile.children.cycles-pp.do_brk_flags
> 0.00 +27.5 27.55 +27.0 27.00 perf-profile.children.cycles-pp.vma_expand
> 0.00 +31.9 31.86 +31.1 31.13 perf-profile.children.cycles-pp.vma_merge_new_range
> 6.50 -3.3 3.19 � 2% -3.1 3.35 perf-profile.self.cycles-pp.do_brk_flags
> 3.35 -1.1 2.25 -1.1 2.25 � 2% perf-profile.self.cycles-pp.mas_wr_store_type
> 5.31 � 2% -0.4 4.88 -0.2 5.14 � 2% perf-profile.self.cycles-pp.__do_sys_brk
> 4.22 � 3% -0.4 3.80 � 2% -0.5 3.70 perf-profile.self.cycles-pp.mas_walk
> 8.47 -0.4 8.07 � 2% -0.5 7.94 perf-profile.self.cycles-pp.perf_event_mmap_output
> 0.71 � 8% -0.3 0.38 � 8% -0.3 0.36 � 12% perf-profile.self.cycles-pp.may_expand_vm
> 5.32 -0.3 5.00 -0.2 5.11 � 3% perf-profile.self.cycles-pp.clear_bhb_loop
> 1.12 � 5% -0.3 0.82 � 4% -0.3 0.80 � 5% perf-profile.self.cycles-pp.can_vma_merge_after
> 2.62 -0.2 2.38 � 5% -0.3 2.32 � 3% perf-profile.self.cycles-pp.down_write
> 0.44 � 28% -0.2 0.20 � 13% -0.2 0.24 � 7% perf-profile.self.cycles-pp.cap_vm_enough_memory
> 2.50 � 3% -0.2 2.31 � 2% -0.2 2.28 perf-profile.self.cycles-pp.mas_preallocate
> 0.61 � 9% -0.2 0.42 � 7% -0.2 0.42 � 6% perf-profile.self.cycles-pp.__vm_enough_memory
> 1.26 � 2% -0.2 1.09 � 9% -0.1 1.14 � 3% perf-profile.self.cycles-pp.sized_strscpy
> 0.57 � 5% -0.1 0.44 � 4% -0.1 0.47 � 8% perf-profile.self.cycles-pp.percpu_counter_add_batch
> 2.25 � 3% -0.1 2.13 � 3% -0.0 2.25 � 2% perf-profile.self.cycles-pp.perf_event_mmap_event
> 2.70 -0.1 2.60 � 2% -0.1 2.58 � 2% perf-profile.self.cycles-pp.arch_get_unmapped_area_topdown_vmflags
> 0.50 � 8% -0.1 0.40 � 12% -0.1 0.41 � 2% perf-profile.self.cycles-pp.strlen
> 0.57 � 4% -0.1 0.52 � 4% -0.0 0.55 � 4% perf-profile.self.cycles-pp.strnlen
> 1.40 � 3% -0.0 1.34 � 2% -0.1 1.33 � 2% perf-profile.self.cycles-pp.down_write_killable
> 0.01 �223% +0.1 0.06 � 15% +0.0 0.05 � 48% perf-profile.self.cycles-pp.anon_vma_interval_tree_remove
> 0.51 � 4% +0.1 0.60 � 5% +0.1 0.60 � 7% perf-profile.self.cycles-pp.__anon_vma_interval_tree_remove
> 2.87 � 2% +0.2 3.10 � 2% +0.2 3.09 � 2% perf-profile.self.cycles-pp.mas_store_prealloc
> 0.61 � 8% +0.2 0.84 � 4% +0.2 0.81 � 7% perf-profile.self.cycles-pp.mas_wr_slot_store
> 0.26 � 7% +0.3 0.56 � 5% +0.3 0.56 � 7% perf-profile.self.cycles-pp.mas_prev_setup
> 0.00 +0.3 0.33 � 3% +0.3 0.31 � 10% perf-profile.self.cycles-pp.mas_next_setup
> 0.53 � 6% +0.4 0.98 � 3% +0.4 0.94 � 7% perf-profile.self.cycles-pp.mas_prev
> 0.00 +0.6 0.56 � 5% +0.6 0.62 � 5% perf-profile.self.cycles-pp.mas_next_range
> 1.29 � 4% +1.2 2.46 � 3% +1.1 2.39 perf-profile.self.cycles-pp.mas_prev_slot
> 0.72 � 4% +1.4 2.07 � 3% +1.4 2.09 perf-profile.self.cycles-pp.mas_next_slot
> 0.00 +1.4 1.40 � 4% +1.2 1.24 � 5% perf-profile.self.cycles-pp.vma_merge_new_range
> 0.00 +3.6 3.55 � 6% +3.4 3.42 � 2% perf-profile.self.cycles-pp.vma_expand
>
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/testtime:
> gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-ivb-2ep2/brk_test/aim9/300s
>
> commit:
> fc21959f74bc11 ("mm: abstract vma_expand() to use vma_merge_struct")
> cacded5e42b960 ("mm: avoid using vma_merge() for new VMAs")
> 2e71337ac26478 ("mm: explicitly enable an expand-only merge mode for brk()")
>
> fc21959f74bc1138 cacded5e42b9609b07b22d80c10 2e71337ac2647889d3d9d76a5ce
> ---------------- --------------------------- ---------------------------
> %stddev %change %stddev %change %stddev
> \ | \ | \
> 201.54 +2.9% 207.44 +2.5% 206.52 time.system_time
> 97.58 -6.0% 91.75 -5.0% 92.66 time.user_time
> 1322908 -5.0% 1256536 -4.1% 1268145 aim9.brk_test.ops_per_sec
> 201.54 +2.9% 207.44 +2.5% 206.52 aim9.time.system_time
> 97.58 -6.0% 91.75 -5.0% 92.66 aim9.time.user_time
> 0.04 � 82% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.10 � 60% -100.0% 0.00 -100.0% 0.00 perf-sched.sch_delay.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 90.66 � 71% +411.1% 463.37 �113% +160.5% 236.20 � 12% perf-sched.wait_and_delay.avg.ms.schedule_timeout.io_schedule_timeout.__wait_for_common.blk_execute_rq
> 127.98 � 86% +586.2% 878.13 �150% +192.6% 374.47 � 56% perf-sched.wait_and_delay.max.ms.schedule_timeout.io_schedule_timeout.__wait_for_common.blk_execute_rq
> 0.04 � 82% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 111.98 � 31% +323.3% 474.03 �108% +110.6% 235.86 � 12% perf-sched.wait_time.avg.ms.schedule_timeout.io_schedule_timeout.__wait_for_common.blk_execute_rq
> 0.10 � 60% -100.0% 0.00 -100.0% 0.00 perf-sched.wait_time.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> 149.30 � 58% +495.3% 888.79 �147% +150.4% 373.80 � 57% perf-sched.wait_time.max.ms.schedule_timeout.io_schedule_timeout.__wait_for_common.blk_execute_rq
> 0.30 � 2% -9.0% 0.27 � 4% -11.5% 0.27 � 7% perf-stat.i.MPKI
> 8.33e+08 +3.9% 8.654e+08 +4.5% 8.708e+08 perf-stat.i.branch-instructions
> 1.15 -0.1 1.09 -0.1 1.08 perf-stat.i.branch-miss-rate%
> 12964626 -1.9% 12711922 -2.6% 12624576 perf-stat.i.branch-misses
> 1.11 -7.4% 1.03 -7.9% 1.03 perf-stat.i.cpi
> 3.943e+09 +6.0% 4.18e+09 +6.7% 4.206e+09 perf-stat.i.instructions
> 0.91 +7.9% 0.98 +8.5% 0.99 perf-stat.i.ipc
> 0.29 � 2% -9.1% 0.27 � 4% -10.8% 0.26 � 7% perf-stat.overall.MPKI
> 1.56 -0.1 1.47 -0.1 1.45 perf-stat.overall.branch-miss-rate%
> 1.08 -6.8% 1.01 -7.2% 1.01 perf-stat.overall.cpi
> 0.92 +7.2% 0.99 +7.8% 0.99 perf-stat.overall.ipc
> 8.303e+08 +3.9% 8.627e+08 +4.5% 8.681e+08 perf-stat.ps.branch-instructions
> 12931205 -2.0% 12678170 -2.6% 12593410 perf-stat.ps.branch-misses
> 3.93e+09 +6.0% 4.167e+09 +6.7% 4.193e+09 perf-stat.ps.instructions
> 1.184e+12 +6.1% 1.256e+12 +6.7% 1.263e+12 perf-stat.total.instructions
> 7.16 � 2% -0.4 6.76 � 4% -0.3 6.83 � 5% perf-profile.calltrace.cycles-pp.entry_SYSRETQ_unsafe_stack.brk
> 5.72 � 2% -0.4 5.35 � 3% -0.2 5.53 � 4% perf-profile.calltrace.cycles-pp.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64
> 6.13 � 2% -0.3 5.84 � 3% -0.2 5.97 � 4% perf-profile.calltrace.cycles-pp.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.83 � 11% -0.1 0.71 � 5% -0.1 0.76 � 5% perf-profile.calltrace.cycles-pp.__vm_enough_memory.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 0.00 +0.6 0.58 � 5% +0.6 0.57 � 8% perf-profile.calltrace.cycles-pp.mas_leaf_max_gap.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range
> 16.73 � 2% +0.6 17.34 +0.5 17.27 � 4% perf-profile.calltrace.cycles-pp.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.7 0.66 � 6% +0.6 0.61 � 45% perf-profile.calltrace.cycles-pp.mas_wr_store_type.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags
> 24.21 +0.7 24.90 +0.5 24.71 � 2% perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 23.33 +0.7 24.05 � 2% +0.5 23.87 � 3% perf-profile.calltrace.cycles-pp.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> 0.00 +0.8 0.82 � 4% +0.9 0.92 � 11% perf-profile.calltrace.cycles-pp.vma_complete.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +0.9 0.87 � 5% +0.9 0.86 � 6% perf-profile.calltrace.cycles-pp.mas_update_gap.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags
> 0.00 +1.1 1.07 � 9% +1.0 1.01 � 14% perf-profile.calltrace.cycles-pp.vma_prepare.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +1.1 1.10 � 6% +1.2 1.15 � 10% perf-profile.calltrace.cycles-pp.mas_preallocate.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +2.3 2.26 � 5% +2.2 2.19 � 5% perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk
> 0.00 +7.6 7.56 � 3% +7.5 7.48 � 4% perf-profile.calltrace.cycles-pp.vma_expand.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64
> 0.00 +8.6 8.62 � 4% +8.4 8.40 � 4% perf-profile.calltrace.cycles-pp.vma_merge_new_range.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 7.74 � 2% -0.4 7.30 � 4% -0.4 7.38 � 5% perf-profile.children.cycles-pp.entry_SYSRETQ_unsafe_stack
> 5.81 � 2% -0.4 5.43 � 3% -0.2 5.60 � 4% perf-profile.children.cycles-pp.perf_event_mmap_event
> 6.18 � 2% -0.3 5.88 � 3% -0.2 6.00 � 4% perf-profile.children.cycles-pp.perf_event_mmap
> 3.93 -0.2 3.73 � 3% -0.1 3.81 � 4% perf-profile.children.cycles-pp.perf_iterate_sb
> 0.22 � 29% -0.1 0.08 � 17% -0.1 0.09 � 42% perf-profile.children.cycles-pp.may_expand_vm
> 0.96 � 3% -0.1 0.83 � 4% -0.0 0.93 � 11% perf-profile.children.cycles-pp.vma_complete
> 0.61 � 14% -0.1 0.52 � 7% -0.0 0.57 � 9% perf-profile.children.cycles-pp.percpu_counter_add_batch
> 0.15 � 7% -0.1 0.08 � 20% -0.1 0.08 � 25% perf-profile.children.cycles-pp.brk_test
> 0.10 � 11% +0.0 0.10 � 28% +0.0 0.12 � 10% perf-profile.children.cycles-pp.run_posix_cpu_timers
> 0.08 � 11% +0.0 0.12 � 14% +0.0 0.12 � 12% perf-profile.children.cycles-pp.mas_prev_setup
> 0.00 +0.0 0.05 � 46% +0.1 0.08 � 16% perf-profile.children.cycles-pp.mas_next_setup
> 0.24 � 19% +0.1 0.31 � 9% +0.1 0.32 � 9% perf-profile.children.cycles-pp.mas_prev
> 0.17 � 12% +0.1 0.27 � 10% +0.0 0.19 � 16% perf-profile.children.cycles-pp.mas_wr_store_entry
> 0.00 +0.2 0.15 � 11% +0.2 0.17 � 8% perf-profile.children.cycles-pp.mas_next_range
> 0.19 � 8% +0.2 0.38 � 10% +0.2 0.41 � 8% perf-profile.children.cycles-pp.mas_next_slot
> 0.34 � 17% +0.3 0.64 � 6% +0.3 0.61 � 6% perf-profile.children.cycles-pp.mas_prev_slot
> 23.40 +0.7 24.12 � 2% +0.5 23.94 � 3% perf-profile.children.cycles-pp.__do_sys_brk
> 0.00 +7.6 7.59 � 3% +7.5 7.49 � 4% perf-profile.children.cycles-pp.vma_expand
> 0.00 +8.7 8.66 � 4% +8.5 8.46 � 4% perf-profile.children.cycles-pp.vma_merge_new_range
> 1.61 � 10% -0.9 0.69 � 8% -0.8 0.83 � 14% perf-profile.self.cycles-pp.do_brk_flags
> 7.64 � 2% -0.4 7.20 � 4% -0.4 7.28 � 5% perf-profile.self.cycles-pp.entry_SYSRETQ_unsafe_stack
> 0.22 � 30% -0.1 0.08 � 17% -0.1 0.09 � 42% perf-profile.self.cycles-pp.may_expand_vm
> 0.57 � 15% -0.1 0.46 � 6% -0.0 0.53 � 10% perf-profile.self.cycles-pp.percpu_counter_add_batch
> 0.77 � 7% -0.1 0.69 � 5% -0.1 0.69 � 5% perf-profile.self.cycles-pp.perf_event_mmap_event
> 0.15 � 7% -0.1 0.08 � 20% -0.1 0.08 � 24% perf-profile.self.cycles-pp.brk_test
> 0.20 � 5% -0.0 0.18 � 4% +0.0 0.20 � 9% perf-profile.self.cycles-pp.anon_vma_interval_tree_insert
> 0.10 � 11% +0.0 0.10 � 28% +0.0 0.12 � 10% perf-profile.self.cycles-pp.run_posix_cpu_timers
> 0.07 � 18% +0.0 0.10 � 18% +0.0 0.11 � 11% perf-profile.self.cycles-pp.mas_prev_setup
> 0.00 +0.1 0.09 � 12% +0.1 0.11 � 9% perf-profile.self.cycles-pp.mas_next_range
> 0.36 � 8% +0.1 0.45 � 6% +0.0 0.40 � 11% perf-profile.self.cycles-pp.perf_event_mmap
> 0.15 � 13% +0.1 0.25 � 14% +0.0 0.17 � 16% perf-profile.self.cycles-pp.mas_wr_store_entry
> 0.17 � 11% +0.2 0.37 � 11% +0.2 0.40 � 9% perf-profile.self.cycles-pp.mas_next_slot
> 0.34 � 17% +0.3 0.64 � 6% +0.3 0.61 � 6% perf-profile.self.cycles-pp.mas_prev_slot
> 0.00 +0.3 0.33 � 5% +0.3 0.30 � 7% perf-profile.self.cycles-pp.vma_merge_new_range
> 0.00 +0.8 0.81 � 9% +0.7 0.74 � 9% perf-profile.self.cycles-pp.vma_expand
>

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