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

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Date:   Wed, 27 Feb 2019 13:56:09 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.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

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

Thanks,
Alexey

>>> 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,
>> Alexey
>>
>>>
>>> thanks,
>>> jirka
>>>
>>