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Groups > linux.kernel > #1669264
| From | Alexey Budankov <alexey.budankov@linux.intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi |
| Date | 2017-06-19 17:30 +0200 |
| Message-ID | <tU6MQ-4pB-75@gated-at.bofh.it> (permalink) |
| References | (2 earlier) <tSLhn-8i0-3@gated-at.bofh.it> <tU4Bk-33y-13@gated-at.bofh.it> <tU4UG-3bd-21@gated-at.bofh.it> <tU54m-3eS-17@gated-at.bofh.it> <tU6D8-4lE-35@gated-at.bofh.it> |
| Organization | Intel Corp. |
On 19.06.2017 18:14, Mark Rutland wrote:
> On Mon, Jun 19, 2017 at 04:37:41PM +0300, Alexey Budankov wrote:
>> On 19.06.2017 16:26, Mark Rutland wrote:
>>> 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?
>>
>> Here it is:
>>
>> list_del corruption. prev->next should be ffff88c2c4654010, but was
>> ffff88c31eb0c020
>> [ 607.632813] ------------[ cut here ]------------
>> [ 607.632816] kernel BUG at lib/list_debug.c:53!
>
>> [ 607.635531] Call Trace:
>> [ 607.635583] list_del_event+0x1d7/0x210
>
> Given this patch changes how list_{del,add}_event() works, it's possible
> that this is a new bug.
>
> I was going to try to test this on arm64, but I couldn't get the patch
> to apply. I had a go with v4.12-rc5, tip/perf/core, and tip/perf/urgent.
>
> Which branch should I be using as the base?
v4.12-rc4+,
perf/core d0fabd1 [origin/perf/core] perf/core: Remove unused
perf_cgroup_event_cgrp_time() function
>
> Thanks,
> Mark
>
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[PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-15 19:50 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-15 22:00 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-16 00:20 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-16 11:20 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-16 16:10 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-16 16:30 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 14:50 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 15:40 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 16:10 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:00 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 17:20 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:30 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 17:30 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:50 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 18:00 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 15:10 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 15:30 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 15:40 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 17:10 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Andi Kleen <ak@linux.intel.com> - 2017-06-19 17:30 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 17:40 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Mark Rutland <mark.rutland@arm.com> - 2017-06-19 17:20 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 17:30 +0200
Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi Alexey Budankov <alexey.budankov@linux.intel.com> - 2017-06-19 22:40 +0200
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