linux-kernel - Re: [PATCH v1 0/3] Fix and improve __maps__fixup_overlap_and

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Date: Wed, 5 Jun 2024 16:54:40 -0700
From: Ian Rogers <irogers@...gle.com>
To: "Steinar H . Gunderson" <sesse@...gle.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/3] Fix and improve __maps__fixup_overlap_and_insert

On Tue, May 21, 2024 at 9:51 AM Ian Rogers <irogers@...gle.com> wrote:
>
> Fix latent unlikely bugs in __maps__fixup_overlap_and_insert.
>
> Improve __maps__fixup_overlap_and_insert's performance 21x in the case
> of overlapping mmaps. sesse@...gle.com reported slowness opening
> perf.data files from chromium where the files contained a large number
> of overlapping mappings. Improve this case primarily by avoiding
> unnecessary sorting.
>
> Unscientific timing data processing a perf.data file with overlapping
> mmap events from chromium:
>
> Before:
> real    0m9.856s
> user    0m9.637s
> sys     0m0.204s
>
> After:
> real    0m0.675s
> user    0m0.454s
> sys     0m0.196s
>
> Tested with address/leak sanitizer, invariant checks and validating
> the before and after output are identical.
>
> Ian Rogers (3):
>   perf maps: Fix use after free in __maps__fixup_overlap_and_insert
>   perf maps: Reduce sorting for overlapping mappings
>   perf maps: Add/use a sorted insert for fixup overlap and insert

Ping. Thanks,
Ian

>  tools/perf/util/maps.c | 113 +++++++++++++++++++++++++++++++++--------
>  1 file changed, 92 insertions(+), 21 deletions(-)
>
> --
> 2.45.0.rc1.225.g2a3ae87e7f-goog
>