linux/kernel/sched/idle_task.c, branch v3.4.19Linux kernel source treehttps://git.amat.us/linux/atom/kernel/sched/idle_task.c?h=v3.4.192012-07-19T15:58:56Zsched/nohz: Rewrite and fix load-avg computation -- again2012-07-19T15:58:56ZPeter Zijlstraa.p.zijlstra@chello.nl2012-06-22T13:52:09Zurn:sha1:7490d0a4cfefa16f9d8ce636eb5b2e13d2432db3
commit 5167e8d5417bf5c322a703d2927daec727ea40dd upstream.
Thanks to Charles Wang for spotting the defects in the current code:
- If we go idle during the sample window -- after sampling, we get a
negative bias because we can negate our own sample.
- If we wake up during the sample window we get a positive bias
because we push the sample to a known active period.
So rewrite the entire nohz load-avg muck once again, now adding
copious documentation to the code.
Reported-and-tested-by: Doug Smythies <dsmythies@telus.net>
Reported-and-tested-by: Charles Wang <muming.wq@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1340373782.18025.74.camel@twins
[ minor edits ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
sched: Move all scheduler bits into kernel/sched/2011-11-17T11:20:22ZPeter Zijlstraa.p.zijlstra@chello.nl2011-11-15T16:14:39Zurn:sha1:391e43da797a96aeb65410281891f6d0b0e9611c
There's too many sched*.[ch] files in kernel/, give them their own
directory.
(No code changed, other than Makefile glue added.)
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>