linux-kernel - Re: [PATCH v2 2/4] perf record: implement -z=<level> and --mmap-flush=<thres> options

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Message-ID: <ea7651bc-0ea9-bdf8-f595-cf42dba4314d@linux.intel.com>
Date:   Wed, 20 Feb 2019 18:19:49 +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 2/4] perf record: implement -z=<level> and
 --mmap-flush=<thres> options


On 12.02.2019 16:09, Jiri Olsa wrote:
> On Mon, Feb 11, 2019 at 11:22:38PM +0300, Alexey Budankov wrote:
>>
>> Implement -z,--compression_level=<n> and --mmap-flush=<dump_least_size>
>> options as well as a special PERF_RECORD_COMPRESSED record that contains
>> compressed parts of kernel data buffer.
>>
>> Because compression requires auxilary memory to implement encoding of
>> kernel data record->opts.nr_cblocks == -1 signifies to preallocate single
>> AIO data buffer aio.data[0] without accompnying AIO control blocks.
>>
>> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
>> ---
>> Changes in v2:
>> - enabled allocation aio data buffers for compression
>>
>> ---
>>  tools/perf/Documentation/perf-record.txt |   9 ++
>>  tools/perf/builtin-record.c              | 110 +++++++++++++++++++----
>>  tools/perf/perf.h                        |   2 +
>>  tools/perf/util/env.h                    |  10 +++
>>  tools/perf/util/event.c                  |   1 +
>>  tools/perf/util/event.h                  |   7 ++
>>  tools/perf/util/evlist.c                 |   6 +-
>>  tools/perf/util/evlist.h                 |   3 +-
>>  tools/perf/util/header.c                 |  45 +++++++++-
>>  tools/perf/util/header.h                 |   1 +
>>  tools/perf/util/mmap.c                   |  98 ++++++++++++--------
>>  tools/perf/util/mmap.h                   |   7 +-
>>  tools/perf/util/session.h                |   2 +
>>  13 files changed, 240 insertions(+), 61 deletions(-)
> 
> this patch is super complicated.. please think of reviewers
> when writing code ;-)
> 
> it needs to be split to small logical patches,
> where each change is explained in changelog

Yes, Will do.

Thanks,
Alexey

> 
> jirka
>