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Message-ID: <20140219130028.GB8169@localhost>
Date: Wed, 19 Feb 2014 21:00:28 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Alex Shi <alex.shi@...aro.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [sched/balance] 7511dd0a7: +2.1e+05% context switches
Alex,
We noticed the below changes for commit
commit 7511dd0a73aaf2ca4bcd829f991dcd2c839c5417
Author: Alex Shi <alex.shi@...aro.org>
AuthorDate: Fri Jan 24 15:17:02 2014 +0800
Commit: Alex Shi <alex.shi@...aro.org>
CommitDate: Fri Feb 14 15:09:01 2014 +0800
sched: only do load balance on tick_do_timer_cpu
that is a central balance.
Signed-off-by: Alex Shi <alex.shi@...aro.org>
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
83892 ~ 5% -96.1% 3245 ~ 7% lkp-snb01/micro/will-it-scale/pthread_mutex2
86509 ~ 5% -96.2% 3271 ~ 6% lkp-snb01/micro/will-it-scale/sched_yield
170401 ~ 5% -96.2% 6517 ~ 7% TOTAL softirqs.SCHED
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
60321 ~ 0% -78.5% 12962 ~ 3% lkp-snb01/micro/will-it-scale/pthread_mutex2
60358 ~ 0% -80.5% 11797 ~ 4% lkp-snb01/micro/will-it-scale/sched_yield
120679 ~ 0% -79.5% 24759 ~ 4% TOTAL interrupts.RES
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
105019 ~ 0% -41.8% 61097 ~ 3% lkp-snb01/micro/will-it-scale/pthread_mutex2
103938 ~ 1% -35.4% 67183 ~ 1% lkp-snb01/micro/will-it-scale/sched_yield
208958 ~ 0% -38.6% 128281 ~ 2% TOTAL cpuidle.C7-SNB.usage
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
2492 ~23% +39.8% 3483 ~14% lkp-snb01/micro/will-it-scale/sched_yield
2492 ~23% +39.8% 3483 ~14% TOTAL cpuidle.C1E-SNB.usage
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
543 ~10% +30.8% 710 ~11% lkp-snb01/micro/will-it-scale/sched_yield
543 ~10% +30.8% 710 ~11% TOTAL cpuidle.C3-SNB.usage
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
20.65 ~ 0% +24.1% 25.63 ~ 2% lkp-snb01/micro/will-it-scale/sched_yield
20.65 ~ 0% +24.1% 25.63 ~ 2% TOTAL turbostat.%c1
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
1268 ~13% +17.0% 1483 ~ 5% lkp-snb01/micro/will-it-scale/sched_yield
1268 ~13% +17.0% 1483 ~ 5% TOTAL numa-vmstat.node0.nr_alloc_batch
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
7255 ~ 2% +14.6% 8317 ~ 2% lkp-snb01/micro/will-it-scale/pthread_mutex2
7255 ~ 2% +14.6% 8317 ~ 2% TOTAL slabinfo.kmalloc-192.num_objs
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
7255 ~ 2% +14.6% 8317 ~ 2% lkp-snb01/micro/will-it-scale/pthread_mutex2
7255 ~ 2% +14.6% 8317 ~ 2% TOTAL slabinfo.kmalloc-192.active_objs
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
683581 ~ 0% -9.3% 620114 ~ 1% lkp-snb01/micro/will-it-scale/sched_yield
683581 ~ 0% -9.3% 620114 ~ 1% TOTAL softirqs.TIMER
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
204033 ~ 1% -8.6% 186557 ~ 2% lkp-snb01/micro/will-it-scale/sched_yield
204033 ~ 1% -8.6% 186557 ~ 2% TOTAL softirqs.RCU
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
4.902e+09 ~ 0% +9.8% 5.385e+09 ~ 1% lkp-snb01/micro/will-it-scale/sched_yield
4.902e+09 ~ 0% +9.8% 5.385e+09 ~ 1% TOTAL cpuidle.C7-SNB.time
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
8204 ~ 2% +11.3% 9134 ~ 4% lkp-snb01/micro/will-it-scale/sched_yield
8204 ~ 2% +11.3% 9134 ~ 4% TOTAL slabinfo.kmalloc-256.num_objs
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
2405 ~25% +2.1e+05% 5058323 ~13% lkp-snb01/micro/will-it-scale/sched_yield
2405 ~25% +2.1e+05% 5058323 ~13% TOTAL vmstat.system.cs
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
2029 ~ 0% +222.9% 6551 ~17% lkp-snb01/micro/will-it-scale/pthread_mutex2
143678 ~42% +4.8e+05% 6.927e+08 ~ 0% lkp-snb01/micro/will-it-scale/sched_yield
145708 ~42% +4.8e+05% 6.927e+08 ~ 0% TOTAL time.involuntary_context_switches
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
1267 ~ 0% -22.3% 985 ~ 1% lkp-snb01/micro/will-it-scale/sched_yield
1267 ~ 0% -22.3% 985 ~ 1% TOTAL time.system_time
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
1518 ~ 0% -4.9% 1444 ~ 1% lkp-snb01/micro/will-it-scale/pthread_mutex2
250 ~ 4% +26.3% 316 ~ 5% lkp-snb01/micro/will-it-scale/sched_yield
1769 ~ 0% -0.5% 1761 ~ 2% TOTAL time.user_time
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
489 ~ 0% -4.9% 464 ~ 1% lkp-snb01/micro/will-it-scale/pthread_mutex2
489 ~ 0% -14.3% 419 ~ 0% lkp-snb01/micro/will-it-scale/sched_yield
978 ~ 0% -9.6% 883 ~ 0% TOTAL time.percent_of_cpu_this_job_got
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
50.58 ~ 0% -2.0% 49.56 ~ 0% lkp-snb01/micro/will-it-scale/pthread_mutex2
50.62 ~ 0% -9.9% 45.62 ~ 1% lkp-snb01/micro/will-it-scale/sched_yield
101.20 ~ 0% -5.9% 95.19 ~ 0% TOTAL turbostat.%c0
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
4386 ~ 0% -5.2% 4158 ~ 0% lkp-snb01/micro/will-it-scale/pthread_mutex2
4386 ~ 0% -5.2% 4158 ~ 0% TOTAL vmstat.system.in
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
148 ~ 0% -1.9% 145 ~ 0% lkp-snb01/micro/will-it-scale/sched_yield
148 ~ 0% -1.9% 145 ~ 0% TOTAL turbostat.Pkg_W
bc575710efe937e 7511dd0a73aaf2ca4bcd829f9
--------------- -------------------------
109 ~ 0% -0.1% 109 ~ 0% lkp-snb01/micro/will-it-scale/pthread_mutex2
121 ~ 0% -2.3% 119 ~ 0% lkp-snb01/micro/will-it-scale/sched_yield
231 ~ 0% -1.3% 228 ~ 0% TOTAL turbostat.Cor_W
time.percent_of_cpu_this_job_got
490 *+-----*---*---*--*---*--*---*---*--*---*---*--*---*--*---*---*--*---*
| .. + |
480 ++ + |
470 ++ * |
| |
460 ++ |
| |
450 ++ |
| |
440 ++ |
430 ++ |
| O |
420 O+ O O O O O O O O O O O O O O O O O O
| |
410 ++-------------------------------------------------------------------+
time.involuntary_context_switches
8e+08 ++-----------------------------------------------------------------+
| |
7e+08 O+ O O O O O O O O O O O O O O O O O O
6e+08 ++ O |
| |
5e+08 ++ |
| |
4e+08 ++ |
| |
3e+08 ++ |
2e+08 ++ |
| |
1e+08 ++ |
| |
0 *+--*--*---*--*---*--*---*--*---*--*---*--*---*--*---*--*---*--*---*
turbostat.%c0
51 *+--------------------------------------------------------------------+
| . .*...*...*..*...*...*..*...*...*...*..*...*...*..*...*...*..*...*
50 ++ *. |
| |
49 ++ |
| |
48 ++ |
| |
47 ++ |
| O
46 ++ O O O O |
O O O O O O O O O O O O O O |
45 ++ |
| O |
44 ++--------------------------------------------------------------------+
vmstat.system.cs
6e+06 ++------------------------------------------------------O----------+
| O O O |
5e+06 O+ O O O O O O O O O O |
| O O O |
| O O
4e+06 ++ |
| |
3e+06 ++ |
| |
2e+06 ++ |
| |
| |
1e+06 ++ |
| |
0 *+--*--*---*--*---*--*---*--*---*--*---*--*---*--*---*--*---*--*---*
Thanks,
Fengguang
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Download attachment "2014-02-16_10:06:49.png" of type "image/png" (26554 bytes)
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