From owner-freebsd-arm@FreeBSD.ORG  Tue May 15 11:53:31 2012
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From: Fabien Thomas <thomas.fabien@gmail.com>
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Date: Tue, 15 May 2012 13:53:28 +0200
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Subject: RFC: hwpmc soft arm
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	Hi,

This patch add sampling support for arm using soft PMC.
At this time only with one level (no backtrace), i'm planning to add it
with ddb code as a base but if some arm guru can give me some pointer it =
will help.

The patch is tested on 8.3 but should works on head.

patch:
http://freebsd.org/~fabient/patch-hwpmc_arm_rev1

add to your kernel conf:
options         HWPMC_HOOKS
device          hwpmc # can be added as a module
options         DEVICE_POLLING

sample capture during buildworld:
kldload hwpmc # if build as a module
pmcstat -Sclock.hard -T -w4
http://freebsd.org/~fabient/pmc_arm.png

Fabien=