linux-kernel - Re: [PATCH] perf_events: fix validate

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Message-ID: <1259135757.4027.5.camel@laptop>
Date:	Wed, 25 Nov 2009 08:55:57 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	eranian@...il.com
Cc:	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, perfmon2-devel@...ts.sf.net, eranian@...gle.com
Subject: Re: [PATCH] perf_events: fix validate_event bug

On Wed, 2009-11-25 at 06:47 +0100, stephane eranian wrote:
> It seems to me you have two ways of solving this:
>   1- push the algorithm to assign events to counters up in the generic code
>   2- have the generic code invoke all possible constraint sources on each group

2, is what it currently does. 

Since we can only add a single event to a group at a time, and we know
the previous group was schedulable, we only need to validate the
constraints on the pmu of the new event.

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