Messages in this thread | | | Date | Mon, 19 Jun 2017 14:26:52 +0100 | From | Mark Rutland <> | Subject | Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi |
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On Mon, Jun 19, 2017 at 04:08:32PM +0300, Alexey Budankov wrote: > On 16.06.2017 1:10, Alexey Budankov wrote: > >On 15.06.2017 22:56, Mark Rutland wrote: > >>On Thu, Jun 15, 2017 at 08:41:42PM +0300, Alexey Budankov wrote: > >>>This series of patches continues v2 and addresses captured comments.
> >>>Specifically this patch replaces pinned_groups and flexible_groups > >>>lists of perf_event_context by red-black cpu indexed trees avoiding > >>>data structures duplication and introducing possibility to iterate > >>>event groups for a specific CPU only.
> >>Have you thrown Vince's perf fuzzer at this? > >> > >>If you haven't, please do. It can be found in the fuzzer directory of: > >> > >>https://github.com/deater/perf_event_tests > > > >Accepted. > > I run the test suite and it revealed no additional regressions in > comparison to what I have on the clean kernel. > > However the fuzzer constantly reports some strange stacks that are > not seen on the clean kernel and I have no idea how that might be > caused by the patches.
Ok; that was the kind of thing I was concerned about.
What you say "strange stacks", what do you mean exactly?
I take it the kernel spewing backtraces in dmesg?
Can you dump those?
Thanks, Mark.
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