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

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Message-ID: <20190212130914.GK775@krava>
Date:   Tue, 12 Feb 2019 14:09:14 +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 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 
or even new script test under tests/shell.. or anything
else really.. just to see that we have some clean
interface for this that we can test

thanks,
jirka