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

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Date:   Tue, 12 Feb 2019 14:09:35 +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 2/4] perf record: implement -z=<level> and
 --mmap-flush=<thres> options

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

jirka