linux-kernel - Re: [PATCH v1 00/13] perf inject improvements

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Message-ID: <ZtYDeE5kTy4KrRC5@google.com>
Date: Mon, 2 Sep 2024 11:27:04 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
	Colin Ian King <colin.i.king@...il.com>,
	Casey Chen <cachen@...estorage.com>,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
	Chaitanya S Prakash <chaitanyas.prakash@....com>,
	James Clark <james.clark@...aro.org>, Ze Gao <zegao2021@...il.com>,
	Yang Jihong <yangjihong1@...wei.com>,
	Yunseong Kim <yskelg@...il.com>,
	Weilin Wang <weilin.wang@...el.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Anne Macedo <retpolanne@...teo.net>,
	Sun Haiyong <sunhaiyong@...ngson.cn>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 00/13] perf inject improvements

On Fri, Aug 16, 2024 at 11:44:29PM -0700, Ian Rogers wrote:
> Fix the existing build id injection by adding sample IDs on to the
> synthesized events. This correctly orders the events and addresses
> issues such as a profiled executable being replaced during its
> execution.
> 
> Add a new --mmap2-buildid-all option that rewrites all mmap events as
> mmap2 events containing build IDs. This removes the need for build_id
> events.
> 
> Add a new -B option that like --mmap2-buildid-all synthesizes mmap2
> with build id events. With -B the behavior is to do it lazily, so only
> when a sample references the particular map. With system wide
> profiling that synthesizes mmap events for all running processes the
> perf.data file savings can be greater than 50%.
> 
> Reduce the memory footprint of perf inject by avoiding creating
> symbols in the callchain, the symbols aren't used during perf inject
> and necessitate the loading of dsos.
> 
> Ian Rogers (13):
>   perf synthetic-events: Avoid unnecessary memset
>   perf map: API clean up
>   perf jit: Constify filename argument
>   perf dso: Constify dso_id
>   perf evsel: Constify evsel__id_hdr_size argument
>   perf test: Expand pipe/inject test
>   perf inject: Combine build_ids and build_id_all into enum
>   perf inject: Combine different mmap and mmap2 functions
>   perf inject: Combine mmap and mmap2 handling
>   perf inject: Fix build ID injection
>   perf inject: Add new mmap2-buildid-all option
>   perf inject: Lazy build-id mmap2 event insertion
>   perf callchain: Allow symbols to be optional when resolving a
>     callchain

For the remaining bits,

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung

> 
>  tools/perf/builtin-inject.c         | 532 ++++++++++++++++++----------
>  tools/perf/builtin-top.c            |   2 +-
>  tools/perf/tests/shell/pipe_test.sh | 103 ++++--
>  tools/perf/tests/vmlinux-kallsyms.c |   4 +-
>  tools/perf/util/build-id.c          |   6 +-
>  tools/perf/util/callchain.c         |   8 +-
>  tools/perf/util/callchain.h         |   2 +-
>  tools/perf/util/dso.c               |   4 +-
>  tools/perf/util/dso.h               |   4 +-
>  tools/perf/util/dsos.c              |  12 +-
>  tools/perf/util/dsos.h              |   2 +-
>  tools/perf/util/evsel.c             |   2 +-
>  tools/perf/util/evsel.h             |   2 +-
>  tools/perf/util/jit.h               |   3 +-
>  tools/perf/util/jitdump.c           |   6 +-
>  tools/perf/util/machine.c           |  95 ++---
>  tools/perf/util/machine.h           |  36 +-
>  tools/perf/util/map.c               |  25 +-
>  tools/perf/util/map.h               |  22 +-
>  tools/perf/util/synthetic-events.c  | 103 +++++-
>  tools/perf/util/synthetic-events.h  |  21 +-
>  21 files changed, 682 insertions(+), 312 deletions(-)
> 
> -- 
> 2.46.0.184.g6999bdac58-goog
>