Date: Wed, 11 Feb 2015 12:39:46 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: linux-kernel@vger.kernel.org, acme@redhat.com, mingo@elte.hu,
        ak@linux.intel.com, jolsa@redhat.com, namhyung@kernel.org,
        cel@us.ibm.com, sukadev@linux.vnet.ibm.com, sonnyrao@chromium.org,
        johnmccutchan@google.com
Subject: Re: [PATCH 0/4] perf: add support for profiling jitted code
Message-ID: <20150211113946.GT23123@twins.programming.kicks-ass.net>
References: <1423611765-18200-1-git-send-email-eranian@google.com>
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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@fb.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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