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

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Message-ID: <1347538571.15764.133.camel@twins>
Date:	Thu, 13 Sep 2012 14:16:11 +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 17:37 +0200, Stephane Eranian wrote:

> Note however that the rotation_list is still used in perf_event_task_tick()
> to iterate over the ctx which needs unthrottling. We would have to switch
> that loop over to a for-each-pmu() which would necessary incur more
> iterations as it would include all the SW PMUs.

Oh urgh, right. I think that was one of the reasons I bailed on the
hrtimer thing, the frequency and throttle stuff.

ctx->nr_freq and needs_unthr could help, but yeah.
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