Messages in this thread | | | Date | Wed, 11 Feb 2015 08:18:37 -0500 | Subject | Re: [PATCH 0/4] perf: add support for profiling jitted code | From | Stephane Eranian <> |
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Peter,
On Wed, Feb 11, 2015 at 6:39 AM, Peter Zijlstra <peterz@infradead.org> wrote: > 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.
I had forgotten that I had modified Sonny's patch to use sched_clock(). I will post V2 using David Ahern's driver instead.
But, we need a portable solution, there are jitted environment on other architectures.
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