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Date:   Wed, 20 Feb 2019 17:48:03 +0300
From:   Alexey Budankov <>
To:     Jiri Olsa <>
Cc:     Arnaldo Carvalho de Melo <>,
        Ingo Molnar <>,
        Peter Zijlstra <>,
        Namhyung Kim <>,
        Alexander Shishkin <>,
        Andi Kleen <>,
        linux-kernel <>
Subject: Re: [PATCH v2 4/4] perf report: support record trace file

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 <>
>> ---
>> 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

This is possible. Let's complete the code review first.


> thanks,
> jirka

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