Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi

[Alexey Budankov]

On 19.06.2017 16:37, Alexey Budankov wrote:
> On 19.06.2017 16:26, Mark Rutland wrote:
> > On Mon, Jun 19, 2017 at 04:08:32PM +0300, Alexey Budankov wrote:
> > > On 16.06.2017 1:10, Alexey Budankov wrote:
> > > > On 15.06.2017 22:56, Mark Rutland wrote:
> > > > > On Thu, Jun 15, 2017 at 08:41:42PM +0300, Alexey Budankov wrote:
> > > > > > This series of patches continues v2 and addresses captured comments.
> >
> > > > > > Specifically this patch replaces pinned_groups and flexible_groups
> > > > > > lists of perf_event_context by red-black cpu indexed trees avoiding
> > > > > > data structures duplication and introducing possibility to iterate
> > > > > > event groups for a specific CPU only.
> >
> > > > > Have you thrown Vince's perf fuzzer at this?
> > > > >
> > > > > If you haven't, please do. It can be found in the fuzzer directory of:
> > > > >
> > > > > https://github.com/deater/perf_event_tests
> > > >
> > > > Accepted.
> > >
> > > I run the test suite and it revealed no additional regressions in
> > > comparison to what I have on the clean kernel.
> > >
> > > However the fuzzer constantly reports some strange stacks that are
> > > not seen on the clean kernel and I have no idea how that might be
> > > caused by the patches.
> >
> > Ok; that was the kind of thing I was concerned about.
> >
> > What you say "strange stacks", what do you mean exactly?
> >
> > I take it the kernel spewing backtraces in dmesg?
> >
> > Can you dump those?
>
> Here it is:
>
> list_del corruption. prev->next should be ffff88c2c4654010, but was 
> ffff88c31eb0c020
> [  607.632813] ------------[ cut here ]------------
> [  607.632816] kernel BUG at lib/list_debug.c:53!
> [  607.632825] invalid opcode: 0000 [#1] SMP
> [  607.632898] Modules linked in: fuse xt_CHECKSUM iptable_mangle 
> ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat 
> nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c tun 
> bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables nfsv3 
> rpcsec_gss_krb5 nfsv4 arc4 md4 nls_utf8 cifs nfs ccm dns_resolver 
> fscache rpcrdma ib_isert iscsi_target_mod ib_iser libiscsi 
> scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp 
> ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm 
> intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp hfi1 coretemp 
> crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate iTCO_wdt 
> intel_uncore iTCO_vendor_support joydev rdmavt intel_rapl_perf i2c_i801 
> ib_core ipmi_ssif mei_me mei ipmi_si ipmi_devintf tpm_tis
> [  607.633954]  lpc_ich pcspkr ipmi_msghandler acpi_pad tpm_tis_core 
> shpchp tpm wmi acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace 
> sunrpc mgag200 drm_kms_helper ttm drm igb crc32c_intel ptp pps_core dca 
> i2c_algo_bit
> [  607.634262] CPU: 271 PID: 28944 Comm: perf_fuzzer Not tainted 
> 4.12.0-rc4+ #22
> [  607.634363] Hardware name: Intel Corporation S7200AP/S7200AP, BIOS 
> S72C610.86B.01.01.0190.080520162104 08/05/2016
> [  607.634505] task: ffff88c2d5714000 task.stack: ffffa6f9352c8000
> [  607.634597] RIP: 0010:__list_del_entry_valid+0x7b/0x90
> [  607.634670] RSP: 0000:ffffa6f9352cbad0 EFLAGS: 00010046
> [  607.634746] RAX: 0000000000000054 RBX: ffff88c2c4654000 RCX: 
> 0000000000000000
> [  607.634845] RDX: 0000000000000000 RSI: ffff88c33fdce168 RDI: 
> ffff88c33fdce168
> [  607.634944] RBP: ffffa6f9352cbad0 R08: 00000000fffffffe R09: 
> 0000000000000600
> [  607.635042] R10: 0000000000000005 R11: 0000000000000000 R12: 
> ffff88c2e71ab200
> [  607.635140] R13: ffff88c2c4654010 R14: 0000000000000001 R15: 
> 0000000000000001
> [  607.635240] FS:  0000000000000000(0000) GS:ffff88c33fdc0000(0000) 
> knlGS:0000000000000000
> [  607.635351] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  607.635431] CR2: 00000000026be1e4 CR3: 0000002488e09000 CR4: 
> 00000000001407e0
> [  607.635531] Call Trace:
> [  607.635583]  list_del_event+0x1d7/0x210
> [  607.635646]  ? perf_cgroup_attach+0x70/0x70
> [  607.635711]  __perf_remove_from_context+0x3e/0x90
> [  607.635783]  ? event_sched_out.isra.90+0x300/0x300
> [  607.635854]  event_function_call+0xbf/0xf0
> [  607.635918]  ? event_sched_out.isra.90+0x300/0x300
> [  607.635991]  perf_remove_from_context+0x25/0x70
> [  607.636060]  perf_event_release_kernel+0xda/0x250
> [  607.636132]  ? __dentry_kill+0x10e/0x160
> [  607.636192]  perf_release+0x10/0x20
> [  607.636249]  __fput+0xdf/0x1e0
> [  607.636299]  ____fput+0xe/0x10
> [  607.636350]  task_work_run+0x83/0xb0
> [  607.636408]  do_exit+0x2bc/0xbc0
> [  607.636460]  ? page_add_file_rmap+0xaf/0x200
> [  607.636526]  ? alloc_set_pte+0x115/0x4f0
> [  607.636587]  do_group_exit+0x3f/0xb0
> [  607.636644]  get_signal+0x1cc/0x5c0
> [  607.636703]  do_signal+0x37/0x6a0
> [  607.636758]  ? __perf_sw_event+0x4f/0x80
> [  607.636821]  ? __do_page_fault+0x2e1/0x4d0
> [  607.636885]  exit_to_usermode_loop+0x4c/0x92
> [  607.636953]  prepare_exit_to_usermode+0x40/0x50
> [  607.637023]  retint_user+0x8/0x13
> [  607.640312] RIP: 0033:0x40f4a9
> [  607.643500] RSP: 002b:00007ffc62d00668 EFLAGS: 00000206 ORIG_RAX: 
> ffffffffffffff02
> [  607.646678] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 
> 000000000001100a
> [  607.649777] RDX: 00007fd5dd25bae0 RSI: 00007fd5dd259760 RDI: 
> 00007fd5dd25a640
> [  607.652791] RBP: 00007ffc62d00680 R08: 00007fd5dd45e740 R09: 
> 0000000000000000
> [  607.655709] R10: 00007fd5dd45ea10 R11: 0000000000000246 R12: 
> 0000000000401980
> [  607.658530] R13: 00007ffc62d02a80 R14: 0000000000000000 R15: 
> 0000000000000000
> [  607.661249] Code: e8 3a f7 d8 ff 0f 0b 48 89 fe 31 c0 48 c7 c7 20 66 
> cb ac e8 27 f7 d8 ff 0f 0b 48 89 fe 31 c0 48 c7 c7 e0 65 cb ac e8 14 f7 
> d8 ff <0f> 0b 48 89 fe 31 c0 48 c7 c7 a8 65 cb ac e8 01 f7 d8 ff 0f 0b
> [  607.666819] RIP: __list_del_entry_valid+0x7b/0x90 RSP: ffffa6f9352cbad0
> [  607.683316] ---[ end trace 34244c35550e0713 ]---
> [  607.691830] Fixing recursive fault but reboot is needed!
>
> 2:
>
> [  467.942059] unchecked MSR access error: WRMSR to 0x711 (tried to 
> write 0x00000000e8cc0055) at rIP: 0xffffffffac05fbd4 
> (native_write_msr+0x4/0x30)
> [  467.942068] Call Trace:
> [  467.942073]  <IRQ>
> [  467.942094]  ? snbep_uncore_msr_enable_event+0x54/0x60 [intel_uncore]
> [  467.942107]  uncore_pmu_event_start+0x9b/0x100 [intel_uncore]
> [  467.942119]  uncore_pmu_event_add+0x235/0x3a0 [intel_uncore]
> [  467.942126]  ? sched_clock+0xb/0x10
> [  467.942132]  ? sched_clock_cpu+0x11/0xb0
> [  467.942140]  event_sched_in.isra.100+0xdf/0x250
> [  467.942145]  sched_in_group+0x210/0x390
> [  467.942150]  ? sched_in_group+0x390/0x390
> [  467.942155]  group_sched_in_flexible_callback+0x17/0x20
> [  467.942160]  perf_cpu_tree_iterate+0x45/0x75
> [  467.942165]  ctx_sched_in+0x97/0x110
> [  467.942169]  perf_event_sched_in+0x77/0x80
> [  467.942174]  ctx_resched+0x69/0xb0
> [  467.942179]  __perf_event_enable+0x208/0x250
> [  467.942184]  event_function+0x93/0xe0
> [  467.942188]  remote_function+0x3b/0x50
> [  467.942194]  flush_smp_call_function_queue+0x71/0x120
> [  467.942200]  generic_smp_call_function_single_interrupt+0x13/0x30
> [  467.942206]  smp_call_function_single_interrupt+0x27/0x40
> [  467.942212]  call_function_single_interrupt+0x93/0xa0
> [  467.942217] RIP: 0010:native_restore_fl+0x6/0x10
> [  467.942220] RSP: 0000:ffff88c33ba03e00 EFLAGS: 00000206 ORIG_RAX: 
> ffffffffffffff04
> [  467.942224] RAX: ffff88c33c8dca08 RBX: ffff88c33c8dc928 RCX: 
> 0000000000000017
> [  467.942227] RDX: 0000000000000000 RSI: 0000000000000206 RDI: 
> 0000000000000206
> [  467.942229] RBP: ffff88c33ba03e00 R08: 0000000000000001 R09: 
> 0000000000007151
> [  467.942232] R10: 0000000000000000 R11: 000000000000005d R12: 
> ffff88c33c8dca08
> [  467.942234] R13: ffff88c33c8dc140 R14: 0000000000000001 R15: 
> 00000000000001d8
> [  467.942241]  _raw_spin_unlock_irqrestore+0x16/0x20
> [  467.942245]  update_blocked_averages+0x2cf/0x4a0
> [  467.942251]  rebalance_domains+0x4b/0x2b0
> [  467.942256]  run_rebalance_domains+0x1d7/0x210
> [  467.942260]  __do_softirq+0xd1/0x27f
> [  467.942267]  irq_exit+0xe9/0x100
> [  467.942271]  scheduler_ipi+0x8f/0x140
> [  467.942275]  smp_reschedule_interrupt+0x29/0x30
> [  467.942280]  reschedule_interrupt+0x93/0xa0
> [  467.942284] RIP: 0010:native_safe_halt+0x6/0x10
> [  467.942286] RSP: 0000:fffffffface03de0 EFLAGS: 00000246 ORIG_RAX: 
> ffffffffffffff02
> [  467.942291] RAX: 0000000000000000 RBX: fffffffface104c0 RCX: 
> 0000000000000000
> [  467.942293] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
> 0000000000000000
> [  467.942295] RBP: fffffffface03de0 R08: 0000006d2c5efae3 R09: 
> 0000000000000000
> [  467.942298] R10: 0000000000000201 R11: 0000000000000930 R12: 
> 0000000000000000
> [  467.942300] R13: fffffffface104c0 R14: 0000000000000000 R15: 
> 0000000000000000
> [  467.942302]  </IRQ>
> [  467.942308]  default_idle+0x20/0x100
> [  467.942313]  arch_cpu_idle+0xf/0x20
> [  467.942317]  default_idle_call+0x2c/0x40
> [  467.942321]  do_idle+0x158/0x1e0
> [  467.942325]  cpu_startup_entry+0x71/0x80
> [  467.942330]  rest_init+0x77/0x80
> [  467.942338]  start_kernel+0x4a7/0x4c8
> [  467.942342]  ? set_init_arg+0x5a/0x5a
> [  467.942348]  ? early_idt_handler_array+0x120/0x120
> [  467.942352]  x86_64_start_reservations+0x29/0x2b
> [  467.942357]  x86_64_start_kernel+0x151/0x174
> [  467.942363]  secondary_startup_64+0x9f/0x9f

One more:

[  484.804717] ------------[ cut here ]------------
[  484.804737] WARNING: CPU: 15 PID: 31168 at 
arch/x86/events/core.c:1257 x86_pmu_start+0x8f/0xb0
[  484.804739] Modules linked in: btrfs xor raid6_pq ufs hfsplus hfs 
minix vfat msdos fat jfs xfs reiserfs binfmt_misc xt_CHECKSUM 
iptable_mangle fuse ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat 
nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack 
nf_conntrack libcrc32c tun bridge stp llc ebtable_filter ebtables 
ip6table_filter nfsv3 ip6_tables arc4 md4 nls_utf8 rpcsec_gss_krb5 cifs 
nfsv4 nfs ccm dns_resolver fscache rpcrdma ib_isert iscsi_target_mod 
ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp 
scsi_transport_srp ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm 
ib_cm iw_cm intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp 
hfi1 coretemp crct10dif_pclmul crc32_pclmul rdmavt ghash_clmulni_intel 
intel_cstate joydev iTCO_wdt intel_uncore ib_core iTCO_vendor_support
[  484.804868]  tpm_tis intel_rapl_perf ipmi_ssif tpm_tis_core ipmi_si 
mei_me tpm ipmi_devintf shpchp acpi_pad lpc_ich ipmi_msghandler pcspkr 
mei i2c_i801 nfsd acpi_power_meter wmi auth_rpcgss nfs_acl lockd grace 
sunrpc mgag200 drm_kms_helper ttm drm igb crc32c_intel ptp pps_core dca 
i2c_algo_bit
[  484.804927] CPU: 15 PID: 31168 Comm: perf_fuzzer Tainted: G        W 
     4.12.0-rc4+ #24
[  484.804930] Hardware name: Intel Corporation S7200AP/S7200AP, BIOS 
S72C610.86B.01.01.0190.080520162104 08/05/2016
[  484.804933] task: ffff8c4699c10000 task.stack: ffff9ad8b5900000
[  484.804938] RIP: 0010:x86_pmu_start+0x8f/0xb0
[  484.804941] RSP: 0000:ffff8c46fbdc3e58 EFLAGS: 00010046
[  484.804945] RAX: 0000000000000000 RBX: ffff8c468068f000 RCX: 
0000000000000002
[  484.804948] RDX: 000000000000000e RSI: 0000000000000002 RDI: 
ffff8c468068f000
[  484.804950] RBP: ffff8c46fbdc3e70 R08: 0000000000000000 R09: 
00000000000004c1
[  484.804952] R10: ffff8c46fbdcaaa0 R11: ffff8c46fbdc3b58 R12: 
ffff8c46fbdca380
[  484.804955] R13: 0000000000000000 R14: ffff8c46fbdca5a4 R15: 
0000000000000001
[  484.804958] FS:  00007f1625c4c740(0000) GS:ffff8c46fbdc0000(0000) 
knlGS:0000000000000000
[  484.804961] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  484.804964] CR2: 000000000061b218 CR3: 0000002f2184f000 CR4: 
00000000001407e0
[  484.804967] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[  484.804969] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000600
[  484.804971] Call Trace:
[  484.804976]  <IRQ>
[  484.804984]  x86_pmu_enable+0x27f/0x2f0
[  484.804992]  perf_pmu_enable+0x22/0x30
[  484.804997]  ctx_resched+0x72/0xb0
[  484.805003]  __perf_event_enable+0x208/0x250
[  484.805008]  event_function+0x93/0xe0
[  484.805012]  remote_function+0x3b/0x50
[  484.805018]  flush_smp_call_function_queue+0x71/0x120
[  484.805024]  generic_smp_call_function_single_interrupt+0x13/0x30
[  484.805030]  smp_trace_call_function_single_interrupt+0x2d/0xd0
[  484.805036]  trace_call_function_single_interrupt+0x93/0xa0
[  484.805040] RIP: 0033:0x40f4a9
[  484.805042] RSP: 002b:00007ffe26fde668 EFLAGS: 00000202 ORIG_RAX: 
ffffffffffffff04
[  484.805047] RAX: 00000000000028a1 RBX: 0000000000000000 RCX: 
0000000000067f43
[  484.805049] RDX: 00007f1625a49ae0 RSI: 00007f1625a47760 RDI: 
00007f1625a48640
[  484.805052] RBP: 00007ffe26fde680 R08: 00007f1625c4c740 R09: 
0000000000000000
[  484.805054] R10: 00007ffe26fde3f0 R11: 0000000000000246 R12: 
0000000000401980
[  484.805056] R13: 00007ffe26fe0a80 R14: 0000000000000000 R15: 
0000000000000000
[  484.805058]  </IRQ>
[  484.805062] Code: 0f ab 02 49 81 c4 08 02 00 00 49 0f ab 04 24 48 89 
df ff 15 9c ca 03 01 48 89 df e8 0c 05 1b 00 5b 41 5c 41 5d 5d c3 0f ff 
eb f5 <0f> ff eb f1 0f ff 66 66 2e 0f 1f 84 00 00 00 00 00 eb a0 66 66
[  484.805161] ---[ end trace dcc4ce8c0a8781e1 ]---
[  508.895507] NMI watchdog: enabled on all CPUs, permanently consumes 
one hw-PMU counter.


> > Thanks,
> > Mark.