netdev - Re: [PATCH v2 2/5] perf record: Prevent override of attr->sample

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Message-ID: <20200904184803.GA3749996@kernel.org>
Date:   Fri, 4 Sep 2020 15:48:03 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 2/5] perf record: Prevent override of
 attr->sample_period for libpfm4 events

Em Fri, Sep 04, 2020 at 09:22:10AM -0700, Ian Rogers escreveu:
> On Fri, Sep 4, 2020 at 9:03 AM Jiri Olsa <jolsa@...hat.com> wrote:
> > On Thu, Sep 03, 2020 at 10:41:14PM -0700, Ian Rogers wrote:
> > > On Wed, Jul 29, 2020 at 4:24 PM Ian Rogers <irogers@...gle.com> wrote:
> > > > On Tue, Jul 28, 2020 at 9:10 AM Jiri Olsa <jolsa@...hat.com> wrote:
> > > > > On Tue, Jul 28, 2020 at 05:59:46PM +0200, Jiri Olsa wrote:
> > > > > > On Tue, Jul 28, 2020 at 01:57:31AM -0700, Ian Rogers wrote:
> > > > > [jolsa@...va perf]$ sudo ./perf test 17 -v
> > > > > 17: Setup struct perf_event_attr                          :

> > > > > running './tests/attr/test-record-C0'
> > > > > expected sample_period=4000, got 3000
> > > > > FAILED './tests/attr/test-record-C0' - match failure

> > > > I'm not able to reproduce this. Do you have a build configuration or
> > > > something else to look at? The test doesn't seem obviously connected
> > > > with this patch.

> > > Jiri, any update? Thanks,

> > sorry, I rebased and ran it again and it passes for me now,
> > so it got fixed along the way

> No worries, thanks for the update! It'd be nice to land this and the
> other libpfm fixes.

I applied it and it generated this regression:

FAILED '/home/acme/libexec/perf-core/tests/attr/test-record-pfm-period' - match failure

I'll look at the other patches that are pending in this regard to see
what needs to be squashed so that we don't break bisect.

- Arnaldo