linux-kernel - Re: [PATCH V3 0/6] perf dlfilter: Add dlfilter-show-cycles

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Date:   Wed, 27 Oct 2021 16:18:37 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 0/6] perf dlfilter: Add dlfilter-show-cycles

Em Wed, Oct 27, 2021 at 11:03:28AM +0300, Adrian Hunter escreveu:
> Hi
> 
> The issue with V1 was that the IPC information used to accumulate cycle
> counts has a lower granularity because it is output only when the cycle
> count correlates to the IP of the event i.e. only when the IPC is exactly
> correct.
> 
> To enable more frequent updates to the cycle count, itrace option 'A' is
> added, which specifies that IPC information can be approximate.
> 
> In addition there are some new miscellaneous patches.

Ok, replacing v2 with this one.
 
> 
> Changes in V3:
> 
>     perf intel-pt: Support itrace A option to approximate IPC
>       Expanded explanation of the loss of accuracy of IPC with 'A' option.
> 
>     Added Reviewed-by: Andi Kleen <ak@...ux.intel.com>
> 
> 
> Changes in V2:
> 
>     perf dlfilter: Add dlfilter-show-cycles
>       Separate counts for branches, instructions or other events.
> 
>     New patches:
>       perf auxtrace: Add missing Z option to ITRACE_HELP
>       perf auxtrace: Add itrace A option to approximate IPC
>       perf intel-pt: Support itrace A option to approximate IPC
>       perf auxtrace: Add itrace d+o option to direct debug log to stdout
>       perf intel-pt: Support itrace d+o option to direct debug log to stdout
> 
> 
> Adrian Hunter (6):
>       perf auxtrace: Add missing Z option to ITRACE_HELP
>       perf auxtrace: Add itrace A option to approximate IPC
>       perf intel-pt: Support itrace A option to approximate IPC
>       perf dlfilter: Add dlfilter-show-cycles
>       perf auxtrace: Add itrace d+o option to direct debug log to stdout
>       perf intel-pt: Support itrace d+o option to direct debug log to stdout
> 
>  tools/perf/Documentation/itrace.txt                |   2 +
>  tools/perf/Documentation/perf-intel-pt.txt         |  28 ++++
>  tools/perf/Makefile.perf                           |   2 +-
>  tools/perf/dlfilters/dlfilter-show-cycles.c        | 144 +++++++++++++++++++++
>  tools/perf/util/auxtrace.c                         |   3 +
>  tools/perf/util/auxtrace.h                         |   6 +
>  .../perf/util/intel-pt-decoder/intel-pt-decoder.c  |   1 +
>  .../perf/util/intel-pt-decoder/intel-pt-decoder.h  |   1 +
>  tools/perf/util/intel-pt-decoder/intel-pt-log.c    |   8 +-
>  tools/perf/util/intel-pt.c                         |  21 ++-
>  10 files changed, 205 insertions(+), 11 deletions(-)
>  create mode 100644 tools/perf/dlfilters/dlfilter-show-cycles.c
> 
> 
> Regards
> Adrian

-- 

- Arnaldo