linux-kernel - Re: [PATCH v2 2/3] perf: use hrtimer for event multiplexing

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Date:	Wed, 12 Sep 2012 16:50:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	Robert Richter <robert.richter@....com>
Subject: Re: [PATCH v2 2/3] perf: use hrtimer for event multiplexing

On Wed, 2012-09-12 at 16:48 +0200, Stephane Eranian wrote:
> On Wed, Sep 12, 2012 at 4:44 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Wed, 2012-09-12 at 16:43 +0200, Stephane Eranian wrote:
> >> The hrtimer_active is used to prevent activating the timer multiple times
> >> in a row.
> >
> > see hrtimer_active(), this should do what you want I think.
> 
> I need something that is true even when the hrtimer is not executing
> the callback handler. I guess that may be the different between
> hrtimer_active() vs. hrtimer_running()?

As the comment states, hrtimer_active() returns true if the timer is
either in the tree (enqueued) or running.

hrtimer_callback_running() is true iff the callback is currently
executing.

hrtimer_queued() is true iff the timer is queued.


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