linux-kernel - Re: [PATCH 0/4] perf: add support for profiling jitted code

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Message-ID: <20150211113946.GT23123@twins.programming.kicks-ass.net>
Date:	Wed, 11 Feb 2015 12:39:46 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, mingo@...e.hu,
	ak@...ux.intel.com, jolsa@...hat.com, namhyung@...nel.org,
	cel@...ibm.com, sukadev@...ux.vnet.ibm.com, sonnyrao@...omium.org,
	johnmccutchan@...gle.com
Subject: Re: [PATCH 0/4] perf: add support for profiling jitted code

On Wed, Feb 11, 2015 at 12:42:41AM +0100, Stephane Eranian wrote:
> To enable synchronization of the runtime MMAPs with those recorded by
> the kernel on behalf of the perf tool, the runtime needs to timestamp
> any record in the dump file using the same time source. The current
> patch series is relying on Sonny Rao's posix-clock patch series
> posted on LKML in 2013. The link to the patches is:
> 	https://lkml.org/lkml/2013/12/6/1044
> 

At least for x86 you could use something like this:

  lkml.kernel.org/r/aa2dd2e4f1e9f2225758be5ba00f14d6909a8ce1.1423180257.git.shli@...com

We can re-create the perf_clock() from the tsc with the mult, shift and
offset provided in the perf userpage.
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