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authorMike Galbraith <mgalbraith@suse.de>2012-08-04 05:44:14 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-13 05:39:01 +0900
commit93875bc33f71bf7a4851b44d387743866b13b130 (patch)
treecb2efc3120da03ba6bddefd3f8b8eddc1dc91c21 /arch/x86/kernel/dumpstack.h
parente08ea4c7d4e90aab75307c3c8018d2d4bbeebc0b (diff)
sched: Fix migration thread runtime bogosity
commit 8f6189684eb4e85e6c593cd710693f09c944450a upstream. Make stop scheduler class do the same accounting as other classes, Migration threads can be caught in the act while doing exec balancing, leading to the below due to use of unmaintained ->se.exec_start. The load that triggered this particular instance was an apparently out of control heavily threaded application that does system monitoring in what equated to an exec bomb, with one of the VERY frequently migrated tasks being ps. %CPU PID USER CMD 99.3 45 root [migration/10] 97.7 53 root [migration/12] 97.0 57 root [migration/13] 90.1 49 root [migration/11] 89.6 65 root [migration/15] 88.7 17 root [migration/3] 80.4 37 root [migration/8] 78.1 41 root [migration/9] 44.2 13 root [migration/2] Signed-off-by: Mike Galbraith <mgalbraith@suse.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1344051854.6739.19.camel@marge.simpson.net Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/kernel/dumpstack.h')
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