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[209.132.180.67]) by mx.google.com with ESMTP id u11si330864plm.8.2018.11.26.05.35.23; Mon, 26 Nov 2018 05:36:20 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726260AbeK0A2e (ORCPT + 99 others); Mon, 26 Nov 2018 19:28:34 -0500 Received: from outbound-smtp25.blacknight.com ([81.17.249.193]:56597 "EHLO outbound-smtp25.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726176AbeK0A2e (ORCPT ); Mon, 26 Nov 2018 19:28:34 -0500 Received: from mail.blacknight.com (pemlinmail01.blacknight.ie [81.17.254.10]) by outbound-smtp25.blacknight.com (Postfix) with ESMTPS id E53B7B8899 for ; Mon, 26 Nov 2018 13:34:21 +0000 (GMT) Received: (qmail 17934 invoked from network); 26 Nov 2018 13:34:21 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[37.228.229.69]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 26 Nov 2018 13:34:21 -0000 Date: Mon, 26 Nov 2018 13:34:20 +0000 From: Mel Gorman To: Johannes Weiner Cc: Tejun Heo , Peter Zijlstra , linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: Hackbench pipes regression bisected to PSI Message-ID: <20181126133420.GN23260@techsingularity.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Johannes, PSI is a great idea but it does have overhead and if enabled by Kconfig then it incurs a hit whether the user is aware of the feature or not. I think enabling by default is unnecessary as it should only be enabled if the information is being consumed. While the Kconfig exists, it's all or nothing if distributions want to have the feature available. I've included a bisection report below showing a 6-10% regression on a single socket skylake machine. Would you mind doing one or all of the following to fix it please? a) disable it by default b) put psi_disable behind a static branch to move the overhead to zero if it's disabled c) optionally enable/disable at runtime (least important as at a glance, this may be problematic) Thanks Bisect parameters ================= CONFIG_AUTO=openSUSE-LEAP-15.0 BUILD_TYPE=make MACHINE=delboy BISECT_REVERSE=no BISECT_MMTESTS_TEST=hackbench-process-pipes BISECT_CONFIG=global-dhp__scheduler-unbound BISECT_GOOD=v4.19 BISECT_BAD=92b419289cee BISECT_LOGDIR=/srv/marvin/impera/bisections-sigma-delboy-global-dhp__scheduler-unbound-openSUSE-LEAP-15.0-openSUSE-LEAP-15.0-v4.19..92b419289cee BISECT_COMPARE=Amean BISECT_PREFER=Lower BISECT_CLIENT="5" BISECT_REBOOT_CLEAN=no BISECT_MONITOR_CONFIG= BISECT_NO_MITIGATIONS=no BISECT_COMMAND="bisection-run --machine delboy --distro openSUSE-LEAP-15.0 --kernel-config openSUSE-LEAP-15.0 --tree make --config global-dhp__scheduler-unbound --mmtests-test hackbench-process-pipes --monitor no-monitor --method sigma --good v4.19 --bad 92b419289cee --walk-mainline --notify mgorman@techsingularity.net --bisect-client 5 --mmtests-limit --iterations 1 --logdir /srv/marvin/impera/bisections-sigma-delboy-global-dhp__scheduler-unbound-openSUSE-LEAP-15.0-openSUSE-LEAP-15.0-v4.19..92b419289cee --reset-trees" BISECT_LOGDIR=/srv/marvin/impera/bisections-sigma-delboy-global-dhp__scheduler-unbound-openSUSE-LEAP-15.0-openSUSE-LEAP-15.0-v4.19..92b419289cee Last good/First bad commit ========================== Last good commit: eb414681d5a07d28d2ff90dc05f69ec6b232ebd2 First bad commit: 2ce7135adc9ad081aa3c49744144376ac74fea60 From 2ce7135adc9ad081aa3c49744144376ac74fea60 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Fri, 26 Oct 2018 15:06:31 -0700 Subject: [PATCH] psi: cgroup support On a system that executes multiple cgrouped jobs and independent workloads, we don't just care about the health of the overall system, but also that of individual jobs, so that we can ensure individual job health, fairness between jobs, or prioritize some jobs over others. This patch implements pressure stall tracking for cgroups. In kernels with CONFIG_PSI=y, cgroup2 groups will have cpu.pressure, memory.pressure, and io.pressure files that track aggregate pressure stall times for only the tasks inside the cgroup. Link: http://lkml.kernel.org/r/20180828172258.3185-10-hannes@cmpxchg.org Signed-off-by: Johannes Weiner Acked-by: Tejun Heo Acked-by: Peter Zijlstra (Intel) Tested-by: Daniel Drake Tested-by: Suren Baghdasaryan Cc: Christopher Lameter Cc: Ingo Molnar Cc: Johannes Weiner Cc: Mike Galbraith Cc: Peter Enderborg Cc: Randy Dunlap Cc: Shakeel Butt Cc: Vinayak Menon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Documentation/accounting/psi.txt | 9 +++ Documentation/admin-guide/cgroup-v2.rst | 18 +++++ include/linux/cgroup-defs.h | 4 ++ include/linux/cgroup.h | 15 ++++ include/linux/psi.h | 25 +++++++ init/Kconfig | 4 ++ kernel/cgroup/cgroup.c | 45 +++++++++++- kernel/sched/psi.c | 118 +++++++++++++++++++++++++++++--- 8 files changed, 228 insertions(+), 10 deletions(-) Comparison ========== initial initial last penup first good-v4.19 bad-92b419289cee good-eb414681 good-95f9ab2d bad-2ce7135a Min 1 1.2980 ( 0.00%) 1.2950 ( 0.23%) 1.2870 ( 0.85%) 1.3100 ( -0.92%) 1.3190 ( -1.62%) Min 3 3.8480 ( 0.00%) 4.0640 ( -5.61%) 3.8070 ( 1.07%) 3.8530 ( -0.13%) 4.1750 ( -8.50%) Min 5 6.7420 ( 0.00%) 8.1480 ( -20.85%) 6.8010 ( -0.88%) 6.7740 ( -0.47%) 7.3370 ( -8.83%) Min 7 9.7230 ( 0.00%) 10.2490 ( -5.41%) 9.7840 ( -0.63%) 9.8940 ( -1.76%) 10.6890 ( -9.94%) Min 12 16.2810 ( 0.00%) 17.6470 ( -8.39%) 16.1740 ( 0.66%) 16.2390 ( 0.26%) 17.1260 ( -5.19%) Min 18 25.2050 ( 0.00%) 25.6510 ( -1.77%) 25.4950 ( -1.15%) 25.4130 ( -0.83%) 25.5330 ( -1.30%) Min 24 31.7720 ( 0.00%) 29.4380 ( 7.35%) 33.3800 ( -5.06%) 31.2400 ( 1.67%) 31.4640 ( 0.97%) Min 30 37.0100 ( 0.00%) 37.6760 ( -1.80%) 33.7630 ( 8.77%) 37.5890 ( -1.56%) 33.2980 ( 10.03%) Min 32 40.0150 ( 0.00%) 39.9460 ( 0.17%) 37.5790 ( 6.09%) 37.7580 ( 5.64%) 38.8230 ( 2.98%) Amean 1 1.3153 ( 0.00%) 1.3530 ( -2.86%) 1.3133 ( 0.15%) 1.3217 ( -0.48%) 1.3243 ( -0.68%) Amean 3 3.8670 ( 0.00%) 4.1097 * -6.28%* 3.8597 ( 0.19%) 3.8943 ( -0.71%) 4.2130 * -8.95%* Amean 5 6.8563 ( 0.00%) 8.3113 * -21.22%* 6.9197 ( -0.92%) 6.8630 ( -0.10%) 7.5630 * -10.31%* Amean 7 9.8650 ( 0.00%) 10.5607 * -7.05%* 9.9627 ( -0.99%) 9.9177 ( -0.53%) 10.7880 * -9.36%* Amean 12 16.5540 ( 0.00%) 18.2850 * -10.46%* 16.7513 ( -1.19%) 16.3700 ( 1.11%) 18.1283 * -9.51%* Amean 18 26.0390 ( 0.00%) 27.4333 ( -5.35%) 27.0223 ( -3.78%) 25.8067 ( 0.89%) 27.2333 ( -4.59%) Amean 24 32.8650 ( 0.00%) 33.0093 ( -0.44%) 34.6167 ( -5.33%) 32.7020 ( 0.50%) 34.9150 ( -6.24%) Amean 30 39.5653 ( 0.00%) 41.0643 ( -3.79%) 36.6733 ( 7.31%) 39.4050 ( 0.41%) 38.1273 ( 3.63%) Amean 32 40.8177 ( 0.00%) 42.1383 ( -3.24%) 39.1487 ( 4.09%) 41.7743 ( -2.34%) 39.4193 * 3.43%* Stddev 1 0.0158 ( 0.00%) 0.0730 (-361.51%) 0.0247 ( -56.14%) 0.0102 ( 35.44%) 0.0061 ( 61.38%) Stddev 3 0.0271 ( 0.00%) 0.0397 ( -46.65%) 0.0627 (-131.53%) 0.0575 (-112.38%) 0.0330 ( -22.06%) Stddev 5 0.1491 ( 0.00%) 0.1744 ( -16.95%) 0.1134 ( 23.94%) 0.0771 ( 48.30%) 0.2126 ( -42.57%) Stddev 7 0.1650 ( 0.00%) 0.2780 ( -68.48%) 0.1663 ( -0.80%) 0.0257 ( 84.43%) 0.0889 ( 46.12%) Stddev 12 0.2395 ( 0.00%) 0.5652 (-135.95%) 0.5726 (-139.03%) 0.1626 ( 32.11%) 0.8698 (-263.10%) Stddev 18 0.8499 ( 0.00%) 1.5949 ( -87.65%) 1.3650 ( -60.60%) 0.3799 ( 55.31%) 1.5393 ( -81.11%) Stddev 24 1.2105 ( 0.00%) 3.3274 (-174.88%) 1.5403 ( -27.25%) 1.2683 ( -4.78%) 3.1545 (-160.60%) Stddev 30 2.4625 ( 0.00%) 2.9472 ( -19.69%) 2.5228 ( -2.45%) 1.5773 ( 35.95%) 5.3969 (-119.17%) Stddev 32 0.9572 ( 0.00%) 2.4088 (-151.66%) 1.5982 ( -66.97%) 4.3986 (-359.54%) 0.5216 ( 45.50%) CoeffVar 1 1.2029 ( 0.00%) 5.3969 (-348.67%) 1.8811 ( -56.38%) 0.7728 ( 35.75%) 0.4614 ( 61.64%) CoeffVar 3 0.7001 ( 0.00%) 0.9661 ( -37.99%) 1.6241 (-131.97%) 1.4765 (-110.89%) 0.7844 ( -12.03%) CoeffVar 5 2.1749 ( 0.00%) 2.0982 ( 3.53%) 1.6392 ( 24.63%) 1.1233 ( 48.35%) 2.8110 ( -29.25%) CoeffVar 7 1.6725 ( 0.00%) 2.6322 ( -57.38%) 1.6694 ( 0.18%) 0.2591 ( 84.51%) 0.8241 ( 50.73%) CoeffVar 12 1.4470 ( 0.00%) 3.0910 (-113.61%) 3.4180 (-136.21%) 0.9934 ( 31.35%) 4.7978 (-231.56%) CoeffVar 18 3.2640 ( 0.00%) 5.8138 ( -78.12%) 5.0512 ( -54.75%) 1.4719 ( 54.91%) 5.6523 ( -73.17%) CoeffVar 24 3.6832 ( 0.00%) 10.0801 (-173.68%) 4.4495 ( -20.81%) 3.8785 ( -5.30%) 9.0349 (-145.30%) CoeffVar 30 6.2238 ( 0.00%) 7.1770 ( -15.32%) 6.8792 ( -10.53%) 4.0027 ( 35.69%) 14.1550 (-127.43%) CoeffVar 32 2.3450 ( 0.00%) 5.7165 (-143.78%) 4.0825 ( -74.09%) 10.5295 (-349.02%) 1.3233 ( 43.57%) Max 1 1.3290 ( 0.00%) 1.4350 ( -7.98%) 1.3360 ( -0.53%) 1.3290 ( 0.00%) 1.3310 ( -0.15%) Max 3 3.8980 ( 0.00%) 4.1360 ( -6.11%) 3.9290 ( -0.80%) 3.9600 ( -1.59%) 4.2350 ( -8.65%) Max 5 7.0250 ( 0.00%) 8.4950 ( -20.93%) 7.0270 ( -0.03%) 6.9090 ( 1.65%) 7.7590 ( -10.45%) Max 7 10.0460 ( 0.00%) 10.7830 ( -7.34%) 10.1130 ( -0.67%) 9.9450 ( 1.01%) 10.8610 ( -8.11%) Max 12 16.7290 ( 0.00%) 18.7230 ( -11.92%) 17.3190 ( -3.53%) 16.5520 ( 1.06%) 18.6840 ( -11.69%) Max 18 26.9040 ( 0.00%) 28.7260 ( -6.77%) 28.1230 ( -4.53%) 26.1710 ( 2.72%) 28.5320 ( -6.05%) Max 24 34.1660 ( 0.00%) 36.0220 ( -5.43%) 36.3420 ( -6.37%) 33.5080 ( 1.93%) 37.6500 ( -10.20%) Max 30 41.9230 ( 0.00%) 43.0330 ( -2.65%) 38.2390 ( 8.79%) 40.4330 ( 3.55%) 43.9530 ( -4.84%) Max 32 41.8770 ( 0.00%) 44.7170 ( -6.78%) 40.7740 ( 2.63%) 46.4750 ( -10.98%) 39.7910 ( 4.98%) BAmean-50 1 1.3085 ( 0.00%) 1.3120 ( -0.27%) 1.3020 ( 0.50%) 1.3180 ( -0.73%) 1.3210 ( -0.96%) BAmean-50 3 3.8515 ( 0.00%) 4.0965 ( -6.36%) 3.8250 ( 0.69%) 3.8615 ( -0.26%) 4.2020 ( -9.10%) BAmean-50 5 6.7720 ( 0.00%) 8.2195 ( -21.37%) 6.8660 ( -1.39%) 6.8400 ( -1.00%) 7.4650 ( -10.23%) BAmean-50 7 9.7745 ( 0.00%) 10.4495 ( -6.91%) 9.8875 ( -1.16%) 9.9040 ( -1.32%) 10.7515 ( -10.00%) BAmean-50 12 16.4665 ( 0.00%) 18.0660 ( -9.71%) 16.4675 ( -0.01%) 16.2790 ( 1.14%) 17.8505 ( -8.40%) BAmean-50 18 25.6065 ( 0.00%) 26.7870 ( -4.61%) 26.4720 ( -3.38%) 25.6245 ( -0.07%) 26.5840 ( -3.82%) BAmean-50 24 32.2145 ( 0.00%) 31.5030 ( 2.21%) 33.7540 ( -4.78%) 32.2990 ( -0.26%) 33.5475 ( -4.14%) BAmean-50 30 38.3865 ( 0.00%) 40.0800 ( -4.41%) 35.8905 ( 6.50%) 38.8910 ( -1.31%) 35.2145 ( 8.26%) BAmean-50 32 40.2880 ( 0.00%) 40.8490 ( -1.39%) 38.3360 ( 4.85%) 39.4240 ( 2.14%) 39.2335 ( 2.62%) BAmean-95 1 1.3153 ( 0.00%) 1.3530 ( -2.86%) 1.3133 ( 0.15%) 1.3217 ( -0.48%) 1.3243 ( -0.68%) BAmean-95 3 3.8670 ( 0.00%) 4.1097 ( -6.28%) 3.8597 ( 0.19%) 3.8943 ( -0.71%) 4.2130 ( -8.95%) BAmean-95 5 6.8563 ( 0.00%) 8.3113 ( -21.22%) 6.9197 ( -0.92%) 6.8630 ( -0.10%) 7.5630 ( -10.31%) BAmean-95 7 9.8650 ( 0.00%) 10.5607 ( -7.05%) 9.9627 ( -0.99%) 9.9177 ( -0.53%) 10.7880 ( -9.36%) BAmean-95 12 16.5540 ( 0.00%) 18.2850 ( -10.46%) 16.7513 ( -1.19%) 16.3700 ( 1.11%) 18.1283 ( -9.51%) BAmean-95 18 26.0390 ( 0.00%) 27.4333 ( -5.35%) 27.0223 ( -3.78%) 25.8067 ( 0.89%) 27.2333 ( -4.59%) BAmean-95 24 32.8650 ( 0.00%) 33.0093 ( -0.44%) 34.6167 ( -5.33%) 32.7020 ( 0.50%) 34.9150 ( -6.24%) BAmean-95 30 39.5653 ( 0.00%) 41.0643 ( -3.79%) 36.6733 ( 7.31%) 39.4050 ( 0.41%) 38.1273 ( 3.63%) BAmean-95 32 40.8177 ( 0.00%) 42.1383 ( -3.24%) 39.1487 ( 4.09%) 41.7743 ( -2.34%) 39.4193 ( 3.43%) BAmean-99 1 1.3153 ( 0.00%) 1.3530 ( -2.86%) 1.3133 ( 0.15%) 1.3217 ( -0.48%) 1.3243 ( -0.68%) BAmean-99 3 3.8670 ( 0.00%) 4.1097 ( -6.28%) 3.8597 ( 0.19%) 3.8943 ( -0.71%) 4.2130 ( -8.95%) BAmean-99 5 6.8563 ( 0.00%) 8.3113 ( -21.22%) 6.9197 ( -0.92%) 6.8630 ( -0.10%) 7.5630 ( -10.31%) BAmean-99 7 9.8650 ( 0.00%) 10.5607 ( -7.05%) 9.9627 ( -0.99%) 9.9177 ( -0.53%) 10.7880 ( -9.36%) BAmean-99 12 16.5540 ( 0.00%) 18.2850 ( -10.46%) 16.7513 ( -1.19%) 16.3700 ( 1.11%) 18.1283 ( -9.51%) BAmean-99 18 26.0390 ( 0.00%) 27.4333 ( -5.35%) 27.0223 ( -3.78%) 25.8067 ( 0.89%) 27.2333 ( -4.59%) BAmean-99 24 32.8650 ( 0.00%) 33.0093 ( -0.44%) 34.6167 ( -5.33%) 32.7020 ( 0.50%) 34.9150 ( -6.24%) BAmean-99 30 39.5653 ( 0.00%) 41.0643 ( -3.79%) 36.6733 ( 7.31%) 39.4050 ( 0.41%) 38.1273 ( 3.63%) BAmean-99 32 40.8177 ( 0.00%) 42.1383 ( -3.24%) 39.1487 ( 4.09%) 41.7743 ( -2.34%) 39.4193 ( 3.43%) Git log ======= git bisect start # good: [84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d] Linux 4.19 git bisect good 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d # bad: [92b419289ceecdd1eae03114928913f298b84327] Merge tag 'riscv-for-linus-4.20-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux git bisect bad 92b419289ceecdd1eae03114928913f298b84327 # good: [84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d] Linux 4.19 git bisect good 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d # good: [26873acacbdbb4e4b444f5dd28dcc4853f0e8ba2] Merge tag 'driver-core-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core git bisect good 26873acacbdbb4e4b444f5dd28dcc4853f0e8ba2 # bad: [738b04fba18d35cd352b7b15afefb8a7b798648e] Merge tag 'staging-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging git bisect bad 738b04fba18d35cd352b7b15afefb8a7b798648e # good: [f2bfc71aee75feff33ca659322b72ffeed5a243d] Merge tag 'drm-intel-next-fixes-2018-10-18' of git://anongit.freedesktop.org/drm/drm-intel into drm-next git bisect good f2bfc71aee75feff33ca659322b72ffeed5a243d # bad: [345671ea0f9258f410eb057b9ced9cefbbe5dc78] Merge branch 'akpm' (patches from Andrew) git bisect bad 345671ea0f9258f410eb057b9ced9cefbbe5dc78 # good: [033078a9afe504ac9e615d10c4b35d634450b637] Merge tag '4.20-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6 git bisect good 033078a9afe504ac9e615d10c4b35d634450b637 # good: [685f7e4f161425b137056abe35ba8ef7b669d83d] Merge tag 'powerpc-4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux git bisect good 685f7e4f161425b137056abe35ba8ef7b669d83d # bad: [d3035be4ce2345d98633a45f93a74e526e94b802] mm: calculate deferred pages after skipping mirrored memory git bisect bad d3035be4ce2345d98633a45f93a74e526e94b802 # good: [95f9ab2d596e8cbb388315e78c82b9a131bf2928] mm: workingset: don't drop refault information prematurely git bisect good 95f9ab2d596e8cbb388315e78c82b9a131bf2928 # bad: [f682a97a00591def7cefbb5003dc04045028e405] mm: provide kernel parameter to allow disabling page init poisoning git bisect bad f682a97a00591def7cefbb5003dc04045028e405 # bad: [c3df29d13044d885695067fa0b1386824942557a] mm/swap.c: remove duplicated include git bisect bad c3df29d13044d885695067fa0b1386824942557a # good: [eb414681d5a07d28d2ff90dc05f69ec6b232ebd2] psi: pressure stall information for CPU, memory, and IO git bisect good eb414681d5a07d28d2ff90dc05f69ec6b232ebd2 # bad: [68d48e6a2df575b935edd420396c3cb8b6aa6ad3] mm: workingset: add vmstat counter for shadow nodes git bisect bad 68d48e6a2df575b935edd420396c3cb8b6aa6ad3 # bad: [505802a53510e54ad5fbbd655a68893df83bfb91] mm: workingset: use cheaper __inc_lruvec_state in irqsafe node reclaim git bisect bad 505802a53510e54ad5fbbd655a68893df83bfb91 # bad: [2ce7135adc9ad081aa3c49744144376ac74fea60] psi: cgroup support git bisect bad 2ce7135adc9ad081aa3c49744144376ac74fea60 # first bad commit: [2ce7135adc9ad081aa3c49744144376ac74fea60] psi: cgroup support -- Mel Gorman SUSE Labs