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

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Message-ID: <ZvTYduigMBtlmNbK@google.com>
Date: Wed, 25 Sep 2024 20:43:50 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Tengda Wu <wutengda@...weicloud.com>, song@...nel.org
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>, 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: Re: [PATCH -next v3 0/2] perf stat: Support inherit events for bperf

Hello,

On Wed, Sep 25, 2024 at 10:16:16PM +0800, Tengda Wu wrote:
> Hello,
> 
> Sorry for pinging again. Is there any other suggestion with this patch set?
> If there is, please let me know.

Sorry I was traveling last week.  I think it's good now.

Song, can I get your ack?

Thanks,
Namhyung

> 
> On 2024/9/16 9:43, Tengda Wu wrote:
> > 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(-)
> > 
>