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    SubjectRe: [PATCH] perf, x86: Optimize intel_pmu_pebs_fixup_ip()
    On Thu, Oct 17, 2013 at 11:03:58AM -0400, Don Zickus wrote:
    > On Thu, Oct 17, 2013 at 04:51:31PM +0200, Peter Zijlstra wrote:
    > > On Thu, Oct 17, 2013 at 10:49:13AM -0400, Don Zickus wrote:
    > > > For some reason this patch is page faulting at an invalid address inside
    > > > __intel_pmu_pebs_event().
    > >
    > > Ah yes, I lost a refresh, but read on; I've send a gazillion new emails
    > > since ;-)
    >
    > Yes, I have noticed, but I got worried when you labeled some of them with
    > 'untested'. :-) Thought I would stick to something a little more close to
    > working.
    >
    > >
    > > I think it was something like: s/this_cpu_ptr/this_cpu_read/ to make it
    > > work again.
    >
    > Thanks. I will try some of the other pieces today (unlike yesterday).

    The patches you find in:

    http://programming.kicks-ass.net/sekrit/patches.tar.bz2

    are actually running on my machine now.

    One of the things I was considering was further shrinking the max basic
    block size from 4k to maybe 1k or 512 bytes. Not sure what a sane basic
    block length limit would be.

    I did try 1k earlier today and I seemed to still get near 100% rewind
    success rates.

    Stephane, Andi, any clues?


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