linux-kernel - Re: [RFC PATCH v2 0/7] libperf: Add interface for overflow check of sampling events

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Message-ID: <Yl8YTSXiC0yP4N3+@krava>
Date:   Tue, 19 Apr 2022 22:15:09 +0200
From:   Jiri Olsa <olsajiri@...il.com>
To:     "nakamura.shun@...itsu.com" <nakamura.shun@...itsu.com>
Cc:     "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "acme@...nel.org" <acme@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "jolsa@...hat.com" <jolsa@...hat.com>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>
Subject: Re: [RFC PATCH v2 0/7] libperf: Add interface for overflow check of
 sampling events

On Mon, Apr 11, 2022 at 08:23:54AM +0000, nakamura.shun@...itsu.com wrote:
> Hi jirka
> 
> Sorry for the late reply.
> 
> > >
> > > Shunsuke Nakamura (7):
> > >   libperf tests: Fix typo in the error message
> > >   libperf: Move 'open_flags' from tools/perf to evsel::open_flags
> > >   libperf: Add perf_evsel__{refresh, period}() functions
> > >   libperf: Introduce perf_{evsel, evlist}__open_opt with extensible
> > >     struct opts
> > >   libperf: Add perf_evsel__check_overflow() functions
> > >   libperf test: Add test_stat_overflow()
> > >   libperf test: Add test_stat_overflow_event()
> > 
> > I'm getting:
> > 
> > [root@...va perf]# make tests
> > running static:
> > - running tests/test-cpumap.c...OK
> > - running tests/test-threadmap.c...OK
> > - running tests/test-evlist.c...OK
> > - running tests/test-evsel.c...FAILED tests/test-evsel.c:286 failed to overflow
> > count FAILED tests/test-evsel.c:286 failed to overflow count
> >   FAILED (2)
> > FAILED tests/main.c:13 test evsel
> > make: *** [Makefile:162: tests] Error 255
> > 
> Thanks for telling me.
> However, we could not reproduce the test failure in our environment.
> Could you please tell me the results of your test with the addition of V=1?

sorry, forgot to answer this one..

[root@...va perf]# LD_LIBRARY_PATH=. ./tests-shared -v
- running tests/test-cpumap.c...OK
- running tests/test-threadmap.c...OK
- running tests/test-evlist.c...
Event  0 -- Raw count = 231217013, run = 10196083, enable = 22183091
         Scaled count = 503046909 (45.96%, 10196083/22183091)
Event  1 -- Raw count = 247219790, run = 10946246, enable = 22182044
         Scaled count = 500979080 (49.35%, 10946246/22182044)
Event  2 -- Raw count = 268999685, run = 11943490, enable = 22180868
         Scaled count = 499573115 (53.85%, 11943490/22180868)
Event  3 -- Raw count = 291383974, run = 12941069, enable = 22179798
         Scaled count = 499405241 (58.35%, 12941069/22179798)
Event  4 -- Raw count = 314293846, run = 13938576, enable = 22178649
         Scaled count = 500095052 (62.85%, 13938576/22178649)
Event  5 -- Raw count = 337393782, run = 14935798, enable = 22177192
         Scaled count = 500974014 (67.35%, 14935798/22177192)
Event  6 -- Raw count = 360218294, run = 15933314, enable = 22175507
         Scaled count = 501340982 (71.85%, 15933314/22175507)
Event  7 -- Raw count = 365516630, run = 16179860, enable = 22173686
         Scaled count = 500922194 (72.97%, 16179860/22173686)
Event  8 -- Raw count = 365180177, run = 16178058, enable = 22171705
         Scaled count = 500472130 (72.97%, 16178058/22171705)
Event  9 -- Raw count = 341205844, run = 15233252, enable = 22169603
         Scaled count = 496571454 (68.71%, 15233252/22169603)
Event 10 -- Raw count = 318204949, run = 14234754, enable = 22167081
         Scaled count = 495524887 (64.22%, 14234754/22167081)
Event 11 -- Raw count = 296671131, run = 13236210, enable = 22164791
         Scaled count = 496792783 (59.72%, 13236210/22164791)
Event 12 -- Raw count = 276639189, run = 12237128, enable = 22162629
         Scaled count = 501020477 (55.22%, 12237128/22162629)
Event 13 -- Raw count = 255437518, run = 11238588, enable = 22160497
         Scaled count = 503677361 (50.71%, 11238588/22160497)
Event 14 -- Raw count = 232427791, run = 10239844, enable = 22158353
         Scaled count = 502958545 (46.21%, 10239844/22158353)
   Expected: 500221918
   High: 503677361   Low:  231217013   Average:  500223614
   Average Error = 0.00%
Event  0 -- overflow flag = 0x1, POLL_UP = 1, other signal event = 0
Event  1 -- overflow flag = 0x2, POLL_UP = 1, other signal event = 0
Event  2 -- overflow flag = 0x4, POLL_UP = 1, other signal event = 0
Event  3 -- overflow flag = 0x8, POLL_UP = 1, other signal event = 0
OK
- running tests/test-evsel.c...
        loop = 65536, count = 328183
        loop = 131072, count = 655863
        loop = 262144, count = 1320613
        loop = 524288, count = 2621943
        loop = 1048576, count = 5243383
        loop = 65536, count = 66349
        loop = 131072, count = 131789
        loop = 262144, count = 264697
        loop = 524288, count = 528484
        loop = 1048576, count = 1056485
        period = 1000000
        overflow limit = 3, overflow count = 2, POLL_IN = 2, POLL_UP = 0, other signal event = 0
FAILED tests/test-evsel.c:286 failed to overflow count
        period = 1000000
        overflow limit = 3, overflow count = 5, POLL_IN = 4, POLL_UP = 1, other signal event = 0
FAILED tests/test-evsel.c:286 failed to overflow count
  FAILED (2)
FAILED tests/main.c:13 test evsel


jirka