linux-kernel - Re: [PATCH 1/3] perf: use hrtimer for event multiplexing

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Date:	Fri, 07 Sep 2012 21:08:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, ak@...ux.intel.com,
	zheng.z.yan@...el.com, robert.richter@....com
Subject: Re: [PATCH 1/3] perf: use hrtimer for event multiplexing

On Fri, 2012-09-07 at 19:03 +0200, Stephane Eranian wrote:
> I think having different intervals would be a good thing, especially for uncore.
> But now, I am wondering how this could work without too much overhead.
> Looks like you're suggesting arming multiple hrtimers if multiple PMU are
> overcommitted. Is that right?

Right, we shoulnd't have too many PMUs anyway, let alone over committed
ones, so a timer per cpu per pmu should be fine.

>  As opposed to having a PMU multiplier off of a
> single per-cpu hrtimer.
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