Re: [PATCH] ftrace, sched: Add TRACE_FLAG_PREEMPT_RESCHED
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- Subject: Re: [PATCH] ftrace, sched: Add TRACE_FLAG_PREEMPT_RESCHED
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Fri, 4 Oct 2013 18:28:04 +0200
- Cc: Yuanhan Liu <yuanhan.liu@xxxxxxxxxxxxxxx>, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx, Fengguang Wu <fengguang.wu@xxxxxxxxx>, Huang Ying <ying.huang@xxxxxxxxx>, lkp@xxxxxxxxxxxxxxx
- In-reply-to: <20131004115712.40c62743@gandalf.local.home>
- User-agent: Mutt/1.5.21 (2012-12-30)
On Fri, Oct 04, 2013 at 11:57:12AM -0400, Steven Rostedt wrote:
> > + need-resched:
> > + 'N' both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED is set,
> > + 'n' only TIF_NEED_RESCHED is set,
> > + 'p' only PREEMPT_NEED_RESCHED is set,
> > + '.' otherwise.
>
> Yes this is actually good enough. I'll have to spend time to explain
> this better. But I'll let you off the hook from doing it for me ;-)
beware; such endevours might lead to books and those are typically out
of date by the time they hit the street -- ie. they're a fair waste of
time ;-)
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