perf_counter: more elaborate write API

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Provide a begin, copy, end interface to the output buffer.

begin() reserves the space,
 copy() copies the data over, considering page boundaries,
  end() finalizes the event and does the wakeup.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Orig-LKML-Reference: <20090325113316.740550870@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Peter Zijlstra 2009-03-25 12:30:22 +01:00 • committed by Ingo Molnar

parent c7138f37f9

commit b9cacc7bf1

1 changed files with 75 additions and 34 deletions

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kernel/perf_counter.c

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