Messages in this thread | | | Date | Mon, 16 Jan 2012 14:22:43 +0600 | Subject | Re: [PATCH] sched: Update scheduler stat documentation. | From | Rakib Mullick <> |
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On Mon, Jan 16, 2012 at 1:56 PM, Ingo Molnar <mingo@elte.hu> wrote: > > * Rakib Mullick <rakib.mullick@gmail.com> wrote: > >> /proc/schedstat's second field reflect to # of time context switch happened not # of times switched to the expired queue. >> >> Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com> >> --- >> >> diff --git a/Documentation/scheduler/sched-stats.txt b/Documentation/scheduler/sched-stats.txt >> index 1cd5d51..7d8e12c 100644 >> --- a/Documentation/scheduler/sched-stats.txt >> +++ b/Documentation/scheduler/sched-stats.txt >> @@ -38,7 +38,8 @@ First field is a sched_yield() statistic: >> 1) # of times sched_yield() was called >> >> Next three are schedule() statistics: >> - 2) # of times we switched to the expired queue and reused it >> + 2) # of times context switch happened. This field is not utilized these >> + days but kept for holding userspace tools integrity. > > if it's not used by anything but kept for the ABI then we should > not put context switch number in there, but always keep it zero, > right? > Yes, quite right. It is a bit confusing. Anyone might have think that context switch numbers are 0. So, instead of saying "# of times context switch happened", we can say, "This field has been kept for ABI integrity". Right?
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