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

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Message-ID: <ZwYS4FEP5yMOCXEv@google.com>
Date: Tue, 8 Oct 2024 22:21:36 -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

On Wed, Sep 25, 2024 at 08:43:50PM -0700, Namhyung Kim wrote:
> 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?

He seems to be very busy.  I'll pick this up and run some tests.

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(-)
> > > 
> >