linux-kernel - Re: perf support user-space hw

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Message-ID: <4FEBD945.4050702@gmail.com>
Date:	Wed, 27 Jun 2012 22:10:45 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>, Jovi Zhang <bookjovi@...il.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org
Subject: Re: perf support user-space hw_breakpoint?

On 6/27/12 8:20 PM, Namhyung Kim wrote:
> NAK. This uses_mmap field is needed to setup per-task-per-cpu events for
> perf record (mostly). Without it, perf suffered from severe scalability
> issues. Maybe we can change it not to create per-task-per-cpu events iff
> for hwbp events only, but I'm not sure it's the right thing.
>
> Thanks,
> Namhyung

Add -a to the record command. And if you want to dump the samples try 
the attached.

David


View attachment "perf-script-bp.patch" of type "text/plain" (1353 bytes)