linux-kernel - Re: 'perf stat --bpf-counters test' failures

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Message-ID: <CAM9d7chqmavCZyJDz0OHe0uGEwp7PuxhHMBZ0cx+U71VpU+1=w@mail.gmail.com>
Date:   Fri, 19 Nov 2021 16:26:33 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Sohaib Mohamed <sohaib.amhmd@...il.com>,
        Song Liu <songliubraving@...com>, Jiri Olsa <jolsa@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 'perf stat --bpf-counters test' failures

Hello,

On Fri, Nov 19, 2021 at 6:08 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Fri, Nov 19, 2021 at 09:28:15AM -0300, Arnaldo Carvalho de Melo wrote:
> >
> > After I updated to fedora 35 I started seeing the errors below,
> > it may well not be related to that, maybe something on libbpf, haven't
> > investigated, have you seen this?
>
> yep, it seems the perf bench is broken so the counts won't correlated
> if I revert this one:
>   92723ea0f11d perf bench: Fix two memory leaks detected with ASan
>
> it works for me again.. it seems to break -t option

Right, it should free the ctx after the thread finishes the work.

Thanks,
Namhyung


>
> Sohaib, could you please check on that?
>
>         [root@...l-r440-01 perf]# ./perf bench sched messaging -g 1 -l 100 -t
>         # Running 'sched/messaging' benchmark:
>         RRRperf: CLIENT: ready write: Bad file descriptor
>         Rperf: SENDER: write: Bad file descriptor