[sched,rcu] b84c4e08143: +3.1% will-it-scale.per_thread_ops

From: Fengguang Wu
Date: Thu Apr 17 2014 - 00:04:06 EST

Hi Paul,

FYI, this improves will-it-scale/open1 throughput.

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2014.04.14a
commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 ("sched,rcu: Make cond_resched() report RCU quiescent states")

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
563496 ~ 0% +3.1% 581059 ~ 0% nhm4/micro/will-it-scale/open1
563496 ~ 0% +3.1% 581059 ~ 0% TOTAL will-it-scale.per_thread_ops

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
756894 ~ 0% +2.8% 778452 ~ 0% nhm4/micro/will-it-scale/open1
756894 ~ 0% +2.8% 778452 ~ 0% TOTAL will-it-scale.per_process_ops

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
0.57 ~ 0% -2.7% 0.55 ~ 0% nhm4/micro/will-it-scale/open1
0.57 ~ 0% -2.7% 0.55 ~ 0% TOTAL will-it-scale.scalability

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
346764 ~ 2% -74.0% 90164 ~ 1% nhm4/micro/will-it-scale/open1
346764 ~ 2% -74.0% 90164 ~ 1% TOTAL slabinfo.kmalloc-256.active_objs

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
10837 ~ 2% -73.9% 2824 ~ 1% nhm4/micro/will-it-scale/open1
10837 ~ 2% -73.9% 2824 ~ 1% TOTAL slabinfo.kmalloc-256.active_slabs

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
10837 ~ 2% -73.9% 2824 ~ 1% nhm4/micro/will-it-scale/open1
10837 ~ 2% -73.9% 2824 ~ 1% TOTAL slabinfo.kmalloc-256.num_slabs

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
346821 ~ 2% -73.9% 90393 ~ 1% nhm4/micro/will-it-scale/open1
346821 ~ 2% -73.9% 90393 ~ 1% TOTAL slabinfo.kmalloc-256.num_objs

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
105961 ~ 1% -63.0% 39153 ~ 1% nhm4/micro/will-it-scale/open1
105961 ~ 1% -63.0% 39153 ~ 1% TOTAL meminfo.SUnreclaim

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
26432 ~ 1% -62.9% 9814 ~ 1% nhm4/micro/will-it-scale/open1
26432 ~ 1% -62.9% 9814 ~ 1% TOTAL proc-vmstat.nr_slab_unreclaimable

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
50298 ~ 0% +194.3% 148011 ~ 0% nhm4/micro/will-it-scale/open1
37020 ~ 0% +42.6% 52798 ~ 1% nhm4/micro/will-it-scale/signal1
87318 ~ 0% +130.0% 200809 ~ 0% TOTAL softirqs.RCU

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
140354 ~ 1% -47.6% 73490 ~ 0% nhm4/micro/will-it-scale/open1
140354 ~ 1% -47.6% 73490 ~ 0% TOTAL meminfo.Slab

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
77391 ~ 1% -46.7% 41235 ~ 2% nhm4/micro/will-it-scale/signal1
77391 ~ 1% -46.7% 41235 ~ 2% TOTAL cpuidle.C6-NHM.usage

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
19871 ~ 2% -37.6% 12397 ~ 2% nhm4/micro/will-it-scale/open1
18497 ~ 1% -37.5% 11556 ~ 1% nhm4/micro/will-it-scale/signal1
38368 ~ 2% -37.6% 23954 ~ 2% TOTAL softirqs.SCHED

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
1.24 ~ 4% -35.4% 0.80 ~ 3% nhm4/micro/will-it-scale/open1
1.24 ~ 4% -35.4% 0.80 ~ 3% TOTAL perf-profile.cpu-cycles.do_notify_resume.int_signal.close

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
1.43 ~ 4% +41.9% 2.03 ~ 4% nhm4/micro/will-it-scale/open1
1.43 ~ 4% +41.9% 2.03 ~ 4% TOTAL perf-profile.cpu-cycles.rcu_process_callbacks.__do_softirq.irq_exit.smp_apic_timer_interrupt.apic_timer_interrupt

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
1.27 ~ 3% -30.0% 0.89 ~ 6% nhm4/micro/will-it-scale/open1
1.27 ~ 3% -30.0% 0.89 ~ 6% TOTAL perf-profile.cpu-cycles.setup_object.isra.46.new_slab.__slab_alloc.kmem_cache_alloc.get_empty_filp

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
1.54 ~ 7% +35.6% 2.09 ~ 8% nhm4/micro/will-it-scale/open1
1.54 ~ 7% +35.6% 2.09 ~ 8% TOTAL perf-profile.cpu-cycles.kmem_cache_alloc.getname_flags.getname.do_sys_open.sys_open

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
4.21 ~ 2% -29.1% 2.98 ~ 3% nhm4/micro/will-it-scale/open1
4.21 ~ 2% -29.1% 2.98 ~ 3% TOTAL perf-profile.cpu-cycles.link_path_walk.path_openat.do_filp_open.do_sys_open.sys_open

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
1.37 ~ 4% -23.1% 1.05 ~ 7% nhm4/micro/will-it-scale/open1
1.37 ~ 4% -23.1% 1.05 ~ 7% TOTAL perf-profile.cpu-cycles.__d_lookup_rcu.lookup_fast.link_path_walk.path_openat.do_filp_open

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
0.88 ~17% +29.1% 1.14 ~ 9% nhm4/micro/will-it-scale/open1
0.88 ~17% +29.1% 1.14 ~ 9% TOTAL perf-profile.cpu-cycles.path_init.path_openat.do_filp_open.do_sys_open.sys_open

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
0.67 ~16% +33.6% 0.90 ~10% nhm4/micro/will-it-scale/signal1
0.67 ~16% +33.6% 0.90 ~10% TOTAL perf-profile.cpu-cycles.restore_sigcontext.sys_rt_sigreturn.stub_rt_sigreturn.raise

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
3.19 ~ 1% +17.4% 3.74 ~ 5% nhm4/micro/will-it-scale/open1
3.19 ~ 1% +17.4% 3.74 ~ 5% TOTAL perf-profile.cpu-cycles.file_free_rcu.rcu_process_callbacks.__do_softirq.irq_exit.smp_apic_timer_interrupt

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
4329 ~ 7% +15.2% 4986 ~ 5% nhm4/micro/will-it-scale/open1
4329 ~ 7% +15.2% 4986 ~ 5% TOTAL slabinfo.vm_area_struct.active_objs

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
2536 ~ 1% -75.8% 614 ~ 9% nhm4/micro/will-it-scale/open1
2536 ~ 1% -75.8% 614 ~ 9% TOTAL time.involuntary_context_switches

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
32593 ~ 1% -62.1% 12349 ~ 2% nhm4/micro/will-it-scale/signal1
32593 ~ 1% -62.1% 12349 ~ 2% TOTAL interrupts.0:IO-APIC-edge.timer

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
4374 ~14% +124.7% 9830 ~ 8% nhm4/micro/will-it-scale/open1
2559 ~ 2% +20.3% 3078 ~ 3% nhm4/micro/will-it-scale/signal1
6934 ~ 9% +86.2% 12908 ~ 7% TOTAL interrupts.RES

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
490 ~ 1% -37.3% 307 ~ 1% nhm4/micro/will-it-scale/signal1
490 ~ 1% -37.3% 307 ~ 1% TOTAL vmstat.system.cs

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
1639 ~ 0% -8.8% 1495 ~ 0% nhm4/micro/will-it-scale/signal1
1639 ~ 0% -8.8% 1495 ~ 0% TOTAL vmstat.system.in

ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--------------- -------------------------
419046 ~ 0% -1.5% 412661 ~ 0% nhm4/micro/will-it-scale/open1
400635 ~ 0% -5.9% 376866 ~ 0% nhm4/micro/will-it-scale/signal1
819681 ~ 0% -3.7% 789527 ~ 0% TOTAL interrupts.LOC


Legend:
~XX% - stddev percent
[+-]XX% - change percent


time.involuntary_context_switches

3500 ++------------------------------------------------------------------+
| .*.. |
3000 ++ .*. *..*.. .*..*.. .*.. |
*..*..*..*. *. * |
| *..*.. .*.. .*..* |
2500 ++ *..*. *..*. |
| |
2000 ++ |
| |
1500 ++ |
| |
| |
1000 ++ |
| O O O O O O O O O
500 O+-O-----------O--O--O--O--------O-O--O--O--O--O--------O-----O--O--+


[*] bisect-good sample
[O] bisect-bad sample

Thanks,
Fengguang
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