linux-kernel - Re: [BUG] perf_events: ctx_flexible_sched

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Message-ID: <1265027223.24455.145.camel@laptop>
Date:	Mon, 01 Feb 2010 13:27:03 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	eranian@...il.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net
Subject: Re: [BUG] perf_events: ctx_flexible_sched_in()

On Mon, 2010-02-01 at 13:20 +0100, Stephane Eranian wrote:
> The function does not allow maximizing PMU usage because of
> the way can_add_hw is managed. Basically, as soon as a group
> fail to be scheduled in, then no other group can. I believe this
> is not optimum. You need to skip the group that fails and keep
> scanning the list. There may be other groups which can be
> scheduled.

Yeah, I saw that too, we need a new hw_ callback for that, or more
structured error values out of ->enable that distinguish between this
event won't fit and pmu full.

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