tree 74f88d57a7f55075d4cd0b46690ff4b319dca642
parent 194002b274e9169a04beb1b23dcc132159bb566c
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1245780791 +0200
committer Ingo Molnar <mingo@elte.hu> 1245958747 +0200

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>