linux-kernel - Re: [PATCH v2 00/14] perf arm-spe: Refactor decoding & dumping flow

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Date:   Tue, 13 Oct 2020 11:53:32 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Wei Li <liwei391@...wei.com>,
        James Clark <james.clark@....com>,
        Andre Przywara <andre.przywara@....com>,
        Dave Martin <Dave.Martin@....com>,
        linux-kernel@...r.kernel.org, Al Grant <Al.Grant@....com>
Subject: Re: [PATCH v2 00/14] perf arm-spe: Refactor decoding & dumping flow

Em Tue, Sep 29, 2020 at 02:39:03PM +0100, Leo Yan escreveu:
> The prominent issue for the SPE trace decoding and dumping is the packet
> header and payload values are hard coded with numbers and it's not
> readable and difficult to maintain; and has other minor issues, e.g. the
> packet length (header + payload) calculation is not correct for some
> packet types, and the dumping flow misses to support specific sub
> classes for operation packet, etc.
> 
> So this patch set is to refactor the Arm SPE decoding SPE with:
> - Patches 01, 02 are minor cleans up;
> - Patches 03, 04 are used to fix and polish the packet and payload
>   length calculation;
> - Patch 05 is to add a helper to wrap up printing strings, this can
>   avoid bunch of duplicate code lines;
> - Patches 06 ~ 12 are used to refactor decoding for different types
>   packet one by one (address packet, context packet, counter packet,
>   event packet, operation packet);
> - Patch 13 is coming from Andre to dump memory tagging;
> - Patch 14 is coming from Wei Li to add decoding for ARMv8.3
>   extension, in this version it has been improved to use defined
>   macros, also is improved for failure handling and commit log.
> 
> This patch set is cleanly applied on the top of perf/core branch
> with commit a55b7bb1c146 ("perf test: Fix msan uninitialized use."),
> and the patches have been verified on Hisilicon D06 platform and I
> manually inspected the dumping result.
> 
> Changes from v1:
> - Heavily rewrote the patch 05 for refactoring printing strings; this
>   is fundamental change, so adjusted the sequence for patches and moved
>   the printing string patch ahead from patch 10 (v1) to patch 05;
> - Changed to use GENMASK_ULL() for bits mask;
> - Added Andre's patch 13 for dumping memory tagging;
> - Refined patch 12 for adding sub classes for Operation packet, merged
>   some commit log from Andre's patch, which allows commit log and code
>   to be more clear; Added "Co-developed-by: Andre Przywara" tag to
>   reflect this.

Ok, so I'll wait for v3, as Leo indicated he'll respin.

Thanks,

- Arnaldo
 
> 
> Andre Przywara (1):
>   perf arm_spe: Decode memory tagging properties
> 
> Leo Yan (12):
>   perf arm-spe: Include bitops.h for BIT() macro
>   perf arm-spe: Fix a typo in comment
>   perf arm-spe: Refactor payload length calculation
>   perf arm-spe: Fix packet length handling
>   perf arm-spe: Refactor printing string to buffer
>   perf arm-spe: Refactor packet header parsing
>   perf arm-spe: Refactor address packet handling
>   perf arm-spe: Refactor context packet handling
>   perf arm-spe: Refactor counter packet handling
>   perf arm-spe: Refactor event type handling
>   perf arm-spe: Refactor operation packet handling
>   perf arm-spe: Add more sub classes for operation packet
> 
> Wei Li (1):
>   perf arm-spe: Add support for ARMv8.3-SPE
> 
>  .../util/arm-spe-decoder/arm-spe-decoder.c    |  54 +-
>  .../util/arm-spe-decoder/arm-spe-decoder.h    |  17 -
>  .../arm-spe-decoder/arm-spe-pkt-decoder.c     | 567 +++++++++++-------
>  .../arm-spe-decoder/arm-spe-pkt-decoder.h     | 124 +++-
>  4 files changed, 478 insertions(+), 284 deletions(-)
> 
> -- 
> 2.20.1
> 

-- 

- Arnaldo