linux-kernel - Re: [PATCH v2 4/4] perf report: support record trace file decompression

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Date:   Wed, 27 Feb 2019 12:17:53 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] perf report: support record trace file
 decompression

On Wed, Feb 27, 2019 at 01:56:09PM +0300, Alexey Budankov wrote:
> Hi,
> 
> On 25.02.2019 19:04, Alexey Budankov wrote:
> > 
> > On 20.02.2019 17:48, Alexey Budankov wrote:
> >>
> >> On 12.02.2019 16:09, Jiri Olsa wrote:
> >>> On Mon, Feb 11, 2019 at 11:25:00PM +0300, Alexey Budankov wrote:
> >>>>
> >>>> PERF_RECORD_COMPRESSED records are decompressed from trace file into
> >>>> a linked list of mmaped memory regions using streaming Zstandard API.
> >>>> After that the regions are loaded fetching uncompressed events. When
> >>>> dumping raw trace (e.g., perf report -D --header) file offsets of
> >>>> events from compressed records are set to zero.
> >>>>
> >>>> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> >>>> ---
> >>>> Changes in v2:
> >>>> - moved compression/decompression code to session layer
> >>>
> >>> could you please add some automated test for this?
> >>>
> >>> I think it could be part of the sample synthesize test 
> 
> Do you mean this one?
> 
> tools/perf/tests/sample-parsing.c

yea, but on second look it does not look suitable,
more likely new shell test under tests/shell?

besically any test that would test that compression
and decompression of events

thanks,
jirka