From: Mike Galbraith <efault@gmx.de>
Date: Fri, 23 Jan 2009 09:13:01 +0000 (+0100)
Subject: perfcounters: throttle on too high IRQ rates
X-Git-Tag: v2.6.31-rc1~383^2~523
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b023a96d9b44f50f4d8ff28c15f5b80e354760f;p=pandora-kernel.git

perfcounters: throttle on too high IRQ rates

Starting kerneltop with only -c 100 seems to be a bad idea, it can
easily lock the system due to perfcounter IRQ overload.

So add throttling: if a new IRQ arrives in a shorter than
PERFMON_MIN_PERIOD_NS time, turn off perfcounters and untrottle them
from the next timer tick.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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