linux-kernel - perf and cgroup event scheduling

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Message-ID: <1301578027.4859.256.camel@twins>
Date:	Thu, 31 Mar 2011 15:27:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: perf and cgroup event scheduling

Hi Stephane,

while trying to make sense of various other fun event scheduling issues,
I noticed that perf_cgroup_switch() isn't always doing the right thing.

So we typically want to schedule: CPU-pinned, TASK-pinned, CPU-flexible
TASK-flexible, however the current code doesn't respect that.

In particular perf_cgroup_sched_in() is placed wrong, it should be
_before_ we schedule in the task contexts.

There's further complications with things like perf_install_in_context()
and perf_cgroup_move(), but those are either rare or 'interesting' to
fix.

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