linux-kernel - Re: [RFC][PATCH 00/11] perf pmu interface -v2

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Date:	Wed, 30 Jun 2010 20:11:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc:	paulus <paulus@...ba.org>,
	stephane eranian <eranian@...glemail.com>,
	Robert Richter <robert.richter@....com>,
	Will Deacon <will.deacon@....com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Yanmin <yanmin_zhang@...ux.intel.com>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 00/11] perf pmu interface -v2

On Wed, 2010-06-30 at 10:19 -0700, Corey Ashford wrote:
> However, there still are concerns relative to writing these control 
> registers from an interrupt handler because of the latency that will be 
> incurred, however slow we choose to do the event rotation.  So at least 
> for the Wire-Speed processor, we may need a worker thread of some sort 
> to hand off the work to. 

Right, once we have per-pmu contexts we can look at having means to
over-ride the means of rotation, such that the pmu can optionally drive
it itself instead of through the common tick.
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