linux-kernel - Re: [PATCH] perf_events: improve Intel event scheduling

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Message-ID: <20091222010941.GC31264@drongo>
Date:	Tue, 22 Dec 2009 12:09:41 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, eranian@...il.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	perfmon2-devel@...ts.sf.net,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] perf_events: improve Intel event scheduling

On Mon, Dec 21, 2009 at 09:59:45PM +0100, Stephane Eranian wrote:

> Ok, so what you are suggesting is that the assignment is actually done
> incrementally in ->enable(). hw_group_sched_in() would simply validate
> that a single group is sane (i.e., can be scheduled if it was alone).

No, hw_group_sched_in needs to validate that this group can go on
along with everything else that has already been enabled.  But as I
have said, if you have the complete list of enabled events to hand,
that's not hard.

On the other hand, hw_perf_event_init does need to validate that a
single group is sane by itself.

Paul.
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