Date: Tue, 15 May 2012 13:53:28 +0200 From: Fabien Thomas <thomas.fabien@gmail.com> To: freebsd-arm@freebsd.org Subject: RFC: hwpmc soft arm Message-ID: <7D3480C9-BFD0-416C-8A65-C31BFE5E093A@gmail.com>
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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=
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