linux-kernel - Re: [PATCH] perf report: Output non-zero offset for decompressed records

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Message-ID: <YWCRi5Rb9sdQ1AV1@kernel.org>
Date:   Fri, 8 Oct 2021 15:44:27 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     "Bayduraev, Alexey V" <alexey.v.bayduraev@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: Re: [PATCH] perf report: Output non-zero offset for decompressed
 records

Em Mon, Oct 04, 2021 at 09:06:36AM +0200, Jiri Olsa escreveu:
> On Mon, Oct 04, 2021 at 10:00:52AM +0300, Bayduraev, Alexey V wrote:
> > On 04.10.2021 9:42, Jiri Olsa wrote:
> > > On Wed, Sep 29, 2021 at 12:14:45PM +0300, Alexey Bayduraev wrote:
> > >> Print offset of PERF_RECORD_COMPRESSED record instead of zero for
> > >> decompressed records in raw trace dump (-D option of perf-report):

> > >> 0x17cf08 [0x28]: event: 9

> > >> instead of:

> > >> 0 [0x28]: event: 9

> > >> The fix is not critical, because currently file_pos for compressed
> > >> events is used in perf_session__process_event only to show offsets
> > >> in the raw dump.

> > > I don't mind the change just curious, because I see also:
> > > 
> > >   perf_session__process_event
> > >     perf_session__process_user_event
> > >       lseek(fd, file_offset, ...

> > > which is not raw dump as the comment suggests

> > Yes, but this "lseek" only works for user events, whereas the 
> > PERF_RECORD_COMPRESSED record shouln't contain such events.
> > Currently, the PERF_RECORD_COMPRESSED container can only pack
> > kernel events. 
 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks, applied.

- Arnaldo