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

Peter Zijlstra
2015-02-11T11:40:15Z

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.