From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 23 Jun 2009 18:13:11 +0000 (+0200)
Subject: perf_counter: Add PERF_EVENT_READ
X-Git-Tag: v2.6.31-rc2~30^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38b200d67636a30cb8dc1508137908e7a649b5c9;p=pandora-kernel.git

perf_counter: Add PERF_EVENT_READ

Provide a read() like event which can be used to log the
counter value at specific sites such as child->parent
folding on exit.

In order to be useful, we log the counter parent ID, not the
actual counter ID, since userspace can only relate parent
IDs to perf_counter_attr constructs.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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