linux-kernel - Re: [RFC 4/5] x86, perf: implements lwp-perf-integration (rc1)

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Message-ID: <20111219090923.GB16765@erda.amd.com>
Date:	Mon, 19 Dec 2011 10:09:23 +0100
From:	Robert Richter <robert.richter@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Benjamin Block <bebl@...eta.org>,
	Hans Rosenfeld <hans.rosenfeld@....com>, <hpa@...or.com>,
	<tglx@...utronix.de>, <suresh.b.siddha@...el.com>,
	<eranian@...gle.com>, <brgerst@...il.com>,
	<Andreas.Herrmann3@....com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Benjamin Block <benjamin.block@....com>
Subject: Re: [RFC 4/5] x86, perf: implements lwp-perf-integration (rc1)

On 19.12.11 00:43:10, Ingo Molnar wrote:
> So the question becomes, how well is it integrated: can
> perf 'record -a + perf report', or 'perf top' use LWP,
> to do system-wide precise [user-space] profiling and such?

There is only self-monitoring of a process possible, no kernel and
system-wide profiling. This is because we can not allocate memory
regions in the kernel for a thread other than the current. This would
require a complete rework of mm code.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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