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Date: Mon, 31 Mar 2014 15:52:21 +0200 From: Vincent Guittot <vincent.guittot@...aro.org> To: Daniel Lezcano <daniel.lezcano@...aro.org> Cc: linux-kernel <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>, "rjw@...ysocki.net" <rjw@...ysocki.net>, Nicolas Pitre <nicolas.pitre@...aro.org>, "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, Alex Shi <alex.shi@...aro.org>, Morten Rasmussen <morten.rasmussen@....com> Subject: Re: [RFC PATCHC 0/3] sched/idle : find the idlest cpu with cpuidle info On 28 March 2014 13:29, Daniel Lezcano <daniel.lezcano@...aro.org> wrote: > The following patchset provides an interaction between cpuidle and the scheduler. > > The first patch encapsulate the needed information for the scheduler in a > separate cpuidle structure. The second one stores the pointer to this structure > when entering idle. The third one, use this information to take the decision to > find the idlest cpu. > > After some basic testing with hackbench, it appears there is an improvement for > the performances (small) and for the duration of the idle states (which provides > a better power saving). > > The measurement has been done with the 'idlestat' tool previously posted in this > mailing list. > > So the benefit is good for both sides performance and power saving. Hi Daniel, I have looked at your results and i'm a bit surprised that you have so much time in C-state with a test that involved 400 tasks on a dual cores HT system. You shouldn't have any CPUs in idle state when running hackbench; the total time of core0state in C7-IVB is 87932131.00(us), which is quite huge for a bench that runs 44sec. Or i'm doing something wrong in the interpretation of the results ? Regards, Vincent > > The select_idle_sibling could be also improved in the same way. > > ====================== test with hackbench 3.14-rc8 ========================= > > /usr/bin/hackbench -l 10000 -s 4096 > > Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks) > Each sender will pass 10000 messages of 4096 bytes > > Time: 44.433 > > Total trace buffer: 1846688 kB > clusterA@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-VB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 0 0.00 0.00 0.00 0.00 > core0@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-IVB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 1396 87932131.00 62988.63 0.00 320146.00 > cpu0@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 1 14.00 14.00 14.00 14.00 > C1E-VB 0 0.00 0.00 0.00 0.00 > C3-IVB 1 262.00 262.00 262.00 262.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 1180 87938177.00 74523.88 1.00 320147.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 0 0.00 0.00 0.00 0.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 0 0.00 0.00 0.00 0.00 > cpu0 wakeups name count > irq009 acpi 1 > cpu1@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-VB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 475 87941356.00 185139.70 322.00 1500690.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 0 0.00 0.00 0.00 0.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 0 0.00 0.00 0.00 0.00 > cpu1 wakeups name count > irq009 acpi 3 > core1@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-IVB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 0 0.00 0.00 0.00 0.00 > cpu2@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 11 288157.00 26196.09 16.00 200060.00 > C1E-VB 6 221601.00 36933.50 79.00 200066.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 950 87417466.00 92018.39 19.00 200074.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 2 34.00 17.00 11.00 23.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 745 18800.00 25.23 2.00 156.00 > cpu2 wakeups name count > irq019 ahci 50 > irq009 acpi 17 > cpu3@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-VB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 0 0.00 0.00 0.00 0.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 0 0.00 0.00 0.00 0.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 0 0.00 0.00 0.00 0.00 > cpu3 wakeups name count > > ================ test with hackbench 3.14-rc8 + patchset ==================== > > /usr/bin/hackbench -l 10000 -s 4096 > > Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks) > Each sender will pass 10000 messages of 4096 bytes > > Time: 42.179 > > Total trace buffer: 1846688 kB > clusterA@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-VB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 0 0.00 0.00 0.00 0.00 > core0@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-IVB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 880 89157590.00 101315.44 0.00 400184.00 > cpu0@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-VB 1 233.00 233.00 233.00 233.00 > C3-IVB 1 260.00 260.00 260.00 260.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 700 89162006.00 127374.29 182.00 400187.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 0 0.00 0.00 0.00 0.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 0 0.00 0.00 0.00 0.00 > cpu0 wakeups name count > irq009 acpi 2 > cpu1@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-VB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 334 89164805.00 266960.49 1.00 1500677.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 0 0.00 0.00 0.00 0.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 0 0.00 0.00 0.00 0.00 > cpu1 wakeups name count > irq009 acpi 6 > core1@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-IVB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 0 0.00 0.00 0.00 0.00 > cpu2@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 19 2169047.00 114160.37 18.00 999129.00 > C1E-IB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 376 86993307.00 231365.18 20.00 1500682.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 0 0.00 0.00 0.00 0.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 0 0.00 0.00 0.00 0.00 > cpu2 wakeups name count > irq009 acpi 32 > irq019 ahci 45 > cpu3@...te hits total(us) avg(us) min(us) max(us) > POLL 0 0.00 0.00 0.00 0.00 > C1-IVB 0 0.00 0.00 0.00 0.00 > C1E-VB 0 0.00 0.00 0.00 0.00 > C3-IVB 0 0.00 0.00 0.00 0.00 > C6-IVB 0 0.00 0.00 0.00 0.00 > C7-IVB 0 0.00 0.00 0.00 0.00 > 1701 0 0.00 0.00 0.00 0.00 > 1700 0 0.00 0.00 0.00 0.00 > 1600 0 0.00 0.00 0.00 0.00 > 1500 0 0.00 0.00 0.00 0.00 > 1400 0 0.00 0.00 0.00 0.00 > 1300 0 0.00 0.00 0.00 0.00 > 1200 0 0.00 0.00 0.00 0.00 > 1100 0 0.00 0.00 0.00 0.00 > 1000 0 0.00 0.00 0.00 0.00 > 900 0 0.00 0.00 0.00 0.00 > 800 0 0.00 0.00 0.00 0.00 > 782 0 0.00 0.00 0.00 0.00 > cpu3 wakeups name count > > > Daniel Lezcano (3): > cpuidle: encapsulate power info in a separate structure > idle: store the idle state the cpu is > sched/fair: use the idle state info to choose the idlest cpu > > arch/arm/include/asm/cpuidle.h | 6 +- > arch/arm/mach-exynos/cpuidle.c | 4 +- > drivers/acpi/processor_idle.c | 4 +- > drivers/base/power/domain.c | 6 +- > drivers/cpuidle/cpuidle-at91.c | 4 +- > drivers/cpuidle/cpuidle-big_little.c | 9 +-- > drivers/cpuidle/cpuidle-calxeda.c | 6 +- > drivers/cpuidle/cpuidle-kirkwood.c | 4 +- > drivers/cpuidle/cpuidle-powernv.c | 8 +-- > drivers/cpuidle/cpuidle-pseries.c | 12 ++-- > drivers/cpuidle/cpuidle-ux500.c | 14 ++--- > drivers/cpuidle/cpuidle-zynq.c | 4 +- > drivers/cpuidle/driver.c | 6 +- > drivers/cpuidle/governors/ladder.c | 14 +++-- > drivers/cpuidle/governors/menu.c | 8 +-- > drivers/cpuidle/sysfs.c | 2 +- > drivers/idle/intel_idle.c | 112 +++++++++++++++++----------------- > include/linux/cpuidle.h | 10 ++- > kernel/sched/fair.c | 46 ++++++++++++-- > kernel/sched/idle.c | 17 +++++- > kernel/sched/sched.h | 5 ++ > 21 files changed, 180 insertions(+), 121 deletions(-) > > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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