linux-kernel - Re: [PATCH v3 0/8] perf session: Extend reader object to allow multiple readers

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Date:   Thu, 14 Oct 2021 08:45:53 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: Re: [PATCH v3 0/8] perf session: Extend reader object to allow
 multiple readers

On Wed, Oct 13, 2021 at 12:06:34PM +0300, Alexey Bayduraev wrote:
> Changes in v4:
> - set/unset active_decomp within reader__process_events

Reviewed-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> 
> Changes in v3:
> - removed struct reader_state in [PATCH v3 1/8]
> - fixed repeating code in [PATCH v3 2/8]
> - split [PATCH v2 4/5] to [PATCH v3 4/8], [PATCH v3 5/8]
> - split [PATCH v2 5/5] to [PATCH v3 6/8] - [PATCH v3 8/8]
> 
> Changes in v2:
> - introduced struct decomp_data suggested by Jiri Olsa
> - removed unnecessary [PATCH v1 1/6]
> - removed unnecessary extra line in [PATCH v2 4/5]
> - removed unnecessary reader_state.eof flag in [PATCH v2 5/5]
> 
> Patchset moves state info and decompressor object into reader object
> that made possible to split reader__process_events function into three
> logical parts: init, map/unmap and single event reader which are used
> in events reader loop. This approach allows reading multiple trace
> files at the same time. 
> 
> The design and implementation are based on the prototype [1], [2].
> The patchset was separated from [3].
> 
> Tested:
> 
> tools/perf/perf record -o prof.data -- matrix.gcc.g.O3
> tools/perf/perf record -o prof.data -z -- matrix.gcc.g.O3
> tools/perf/perf report -i prof.data
> tools/perf/perf report -i prof.data --call-graph=callee
> tools/perf/perf report -i prof.data --stdio --header
> tools/perf/perf report -i prof.data -D --header
> 
> [1] git clone https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git -b perf/record_threads
> [2] https://lore.kernel.org/lkml/20180913125450.21342-1-jolsa@kernel.org/
> [3] https://lore.kernel.org/lkml/cover.1629186429.git.alexey.v.bayduraev@linux.intel.com/
> 
> Alexey Bayduraev (8):
>   perf session: Move all state items to reader object
>   perf session: Introduce decompressor in reader object
>   perf session: Move init/release code to separate functions
>   perf session: Move map code to separate function
>   perf session: Move unmap code to reader__mmap
>   perf session: Move event read code to separate function
>   perf session: Introduce reader return codes
>   perf session: Introduce reader EOF function
> 
>  tools/perf/util/session.c | 193 ++++++++++++++++++++++++++------------
>  tools/perf/util/session.h |  10 +-
>  2 files changed, 141 insertions(+), 62 deletions(-)
> 
> -- 
> 2.19.0
>