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