linux-kernel - Re: [PATCH] perf_events: improve x86 event scheduling (v5)

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Date:	Mon, 18 Jan 2010 15:56:41 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, perfmon2-devel@...ts.sf.net, eranian@...il.com
Subject: Re: [PATCH]  perf_events: improve x86 event scheduling (v5)

On Mon, 2010-01-18 at 15:45 +0100, Frederic Weisbecker wrote:
> 
> > > That requires to know in advance if we have hardware pmu
> > > in the list though (can be a flag in the group).
> > 
> > Good point, but your proposed hw_check_constraint() call needs to know
> > the exact same.
> 
> 
> True. Whatever model we use anyway, both implement the same idea.

Hmm, we seem to already have that problem (which would indicate another
bug in the hw-breakpoint stuff), how do you deal with
hw_perf_{enable,disable}() for the breakpoints?

We could fix this by making these pmu state functions into a callback
list visiting all registered PMUs.

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