* tip-bot for Andi Kleen <tipbot@xxxxxxxxx> wrote:
> Commit-ID: 4576ceaa56a86bd0c041c204d51c3f3ca582a49c
> Gitweb: http://git.kernel.org/tip/4576ceaa56a86bd0c041c204d51c3f3ca582a49c
> Author: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> AuthorDate: Mon, 30 Nov 2015 16:28:09 -0800
> Committer: Ingo Molnar <mingo@xxxxxxxxxx>
> CommitDate: Fri, 4 Dec 2015 10:08:04 +0100
>
> perf/x86: Use INST_RETIRED.PREC_DIST for cycles:ppp
>
> Add a new 'three-p' precise level, that uses INST_RETIRED.PREC_DIST as
> base. The basic mechanism of abusing the inverse cmask to get all
> cycles works the same as before.
So this commit regressed on the follwing Intel Nehalem box:
processor : 15
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X55600 @ 2.80GHz
stepping : 5
cpu MHz : 2793.000
cache size : 8192 KB
it has this perf bootup signature:
0.272504] Performance Events: PEBS fmt1+, 16-deep LBR, Nehalem events, Intel PMU driver.
0.281356] perf_event_intel: CPU erratum AAJ80 worked around
the symptom is that latest 'perf top' and 'perf record' produces no samples.
So I've removed this commit and the related Skylake commit from -tip:
4576ceaa56a8 perf/x86: Use INST_RETIRED.PREC_DIST for cycles:ppp
ac1e1d30cf90 perf/x86: Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake
you need to do better testing next time around. Note: if you resubmit the patches,
please also pick up the updates commit changelogs from the tip-bot emails, don't
use your original changelogs.
Also, I'm not convinced we need a new 'ppp' qualifier for any of this, why not
just replace 'pp' with this event - 'pp' is meant to be our most precise event.
Thanks,
Ingo
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