From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Thu, 17 Sep 2009 17:01:10 +0000 (+0200)
Subject: perf_counter: Allow for a wakeup watermark
X-Git-Tag: v2.6.32-rc1~628^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2667de81f3256c944b06abdf2c56c2f192fcb724;p=pandora-kernel.git

perf_counter: Allow for a wakeup watermark

Currently we wake the mmap() consumer once every PAGE_SIZE of data
and/or once event wakeup_events when specified.

For high speed sampling this results in too many wakeups wrt. the
buffer size, hence change this.

We move the default wakeup limit to 1/4-th the buffer size, and
provide for means to manually specify this limit.

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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