linux-kernel - [PATCH -next v3 0/2] perf stat: Support inherit events for bperf

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Message-Id: <20240916014318.267709-1-wutengda@huaweicloud.com>
Date: Mon, 16 Sep 2024 01:43:16 +0000
From: Tengda Wu <wutengda@...weicloud.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Namhyung Kim <namhyung@...nel.org>
Cc: song@...nel.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>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	kan.liang@...ux.intel.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH -next v3 0/2] perf stat: Support inherit events for bperf

Hi,

Here is the 3th version of the series to support inherit events for bperf.
This version add pid or tgid selection based on filter type in new_task
prog to avoid memory waste and potential count loss.


bperf (perf-stat --bpf-counter) has not supported inherit events
during fork() since it was first introduced.

This patch series tries to add this support by:
 1) adding two new bpf programs to monitor task lifecycle;
 2) recording new tasks in the filter map dynamically;
 3) reusing `accum_key` of parent task for new tasks.

Thanks,
Tengda


Changelog:
---------
v3: (Address comments from Namhyung, thanks)
 * Use pid or tgid based on filter type in new_task prog
 * Add comments to explain pid usage for TGID type in exit_task prog

v2: https://lore.kernel.org/all/20240905115918.772234-1-wutengda@huaweicloud.com/
 * Remove the unused init_filter_entries in follower bpf, declare
   a global filter_entry_count in bpf_counter instead
 * Attach on_newtask and on_exittask progs only if the filter type
   is either PID or TGID

v1: https://lore.kernel.org/all/20240904123103.732507-1-wutengda@huaweicloud.com/


Tengda Wu (2):
  perf stat: Support inherit events during fork() for bperf
  perf test: Use sqrtloop workload to test bperf event

 tools/perf/tests/shell/stat_bpf_counters.sh   |  2 +-
 tools/perf/util/bpf_counter.c                 | 32 +++++--
 tools/perf/util/bpf_skel/bperf_follower.bpf.c | 87 +++++++++++++++++--
 tools/perf/util/bpf_skel/bperf_u.h            |  5 ++
 4 files changed, 112 insertions(+), 14 deletions(-)

-- 
2.34.1