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SubjectRe: [PATCH] sched/fair: change where we report sched stats
On 12/10/2014 01:23 AM, Mike Galbraith wrote:
> On Tue, 2014-12-09 at 13:21 -0500, Josef Bacik wrote:
>
>> This patch moves stat stuff to after the schedule, right as we are waking up,
>
> But sleep/block ends when the task is awakened/enqueued, not when it
> gets the CPU. You're adding scheduling latency, breaking accounting.
>

Yes I'm aware of that. I don't care if the delay time is slightly
higher than normal, I care about knowing exactly why we were sleeping to
begin with. I suppose I could leave the accounting part where it is and
then just fire the tracepoint when it's put on the CPU so we get the
best of both worlds, but honestly I don't feel like adding the extra
scheduling latency into the accounting is that big of a deal. Thanks,

Josef



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