linux-kernel - Re: [PATCH V2 00/10] perf script: Add API for filtering via dynamically loaded shared object

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Date:   Tue, 29 Jun 2021 12:28:24 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 00/10] perf script: Add API for filtering via
 dynamically loaded shared object

Hi Adrian,

On Sun, Jun 27, 2021 at 6:18 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> Hi
>
> In some cases, users want to filter very large amounts of data (e.g. from
> AUX area tracing like Intel PT) looking for something specific. While
> scripting such as Python can be used, Python is 10 to 20 times slower than
> C. So define a C API so that custom filters can be written and loaded.

Thanks for your work!  I guess we can use this for perf report (and others)
to have a custom filter too.

Thanks,
Namhyung

>
> This is V2.
>
> The main patch is patch 1.
>
> The other patches add more functionality, except for patch 5 which installs
> the C API header file.
>
>
> Changes in V2:
>     perf script: Move filter_cpu() earlier
>     perf script: Move filtering before scripting
>     perf script: Share addr_al between functions
>         Dropped because they have now been applied.
>
>     perf script: Add API for filtering via dynamically loaded shared object
>         Move 2 members of struct perf_dlfilter_sample
>         Add 'ctx' as an argument to 'start' and 'stop'
>         Find dlfilter .so files in current directory or exec-path/dlfilters
>
>     perf script: Add option to list dlfilters
>         New patch
>
>     perf script: Add option to pass arguments to dlfilters
>         New patch
>
>
> Adrian Hunter (10):
>       perf script: Add API for filtering via dynamically loaded shared object
>       perf script: Add dlfilter__filter_event_early()
>       perf script: Add option to list dlfilters
>       perf script: Add option to pass arguments to dlfilters
>       perf build: Install perf_dlfilter.h
>       perf dlfilter: Add resolve_address() to perf_dlfilter_fns
>       perf dlfilter: Add insn() to perf_dlfilter_fns
>       perf dlfilter: Add srcline() to perf_dlfilter_fns
>       perf dlfilter: Add attr() to perf_dlfilter_fns
>       perf dlfilter: Add object_code() to perf_dlfilter_fns
>
>  tools/perf/Documentation/perf-dlfilter.txt | 251 ++++++++++++
>  tools/perf/Documentation/perf-script.txt   |  15 +-
>  tools/perf/Makefile.config                 |   3 +
>  tools/perf/Makefile.perf                   |   4 +-
>  tools/perf/builtin-script.c                |  86 +++-
>  tools/perf/util/Build                      |   1 +
>  tools/perf/util/dlfilter.c                 | 615 +++++++++++++++++++++++++++++
>  tools/perf/util/dlfilter.h                 |  97 +++++
>  tools/perf/util/perf_dlfilter.h            | 150 +++++++
>  9 files changed, 1211 insertions(+), 11 deletions(-)
>  create mode 100644 tools/perf/Documentation/perf-dlfilter.txt
>  create mode 100644 tools/perf/util/dlfilter.c
>  create mode 100644 tools/perf/util/dlfilter.h
>  create mode 100644 tools/perf/util/perf_dlfilter.h
>
>
> Regards
> Adrian