Received-SPF: pass (google.com: domain of linux-kernel+bounces-80251-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Precedence: bulk
MIME-Version: 1.0
References: <20240214063708.972376-1-irogers@google.com>
In-Reply-To: <20240214063708.972376-1-irogers@google.com>
From: Ian Rogers <irogers@google.com>
Date: Sun, 25 Feb 2024 10:50:55 -0800
Message-ID: <CAP-5=fUhK9FaP4c5sSsM_DdNB+MipEvDDwO1e-n9fK5GLn87wA@mail.gmail.com>
Subject: Re: [PATCH v1 0/6] Thread memory improvements and fixes
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, 
	Arnaldo Carvalho de Melo <acme@kernel.org>, Namhyung Kim <namhyung@kernel.org>, 
	Mark Rutland <mark.rutland@arm.com>, 
	Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>, 
	Ian Rogers <irogers@google.com>, Adrian Hunter <adrian.hunter@intel.com>, 
	Oliver Upton <oliver.upton@linux.dev>, Yang Jihong <yangjihong1@huawei.com>, 
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, 
	bpf@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Tue, Feb 13, 2024 at 10:37=E2=80=AFPM Ian Rogers <irogers@google.com> wr=
ote:
>
> The next 6 patches from:
> https://lore.kernel.org/lkml/20240202061532.1939474-1-irogers@google.com/
> now the initial maps fixes have landed:
> https://lore.kernel.org/all/20240210031746.4057262-1-irogers@google.com/
>
> Separate out and reimplement threads to use a hashmap for lower memory
> consumption and faster look up. The fixes a regression in memory usage
> where reference count checking switched to using non-invasive tree
> nodes.  Reduce threads default size by 32 times and improve locking
> discipline. Also, fix regressions where tids had become unordered to
> make `perf report --tasks` and `perf trace --summary` output easier to
> read.
>
> Ian Rogers (6):
>   perf report: Sort child tasks by tid
>   perf trace: Ignore thread hashing in summary
>   perf machine: Move fprintf to for_each loop and a callback
>   perf threads: Move threads to its own files
>   perf threads: Switch from rbtree to hashmap
>   perf threads: Reduce table size from 256 to 8
>
>  tools/perf/builtin-report.c           | 203 ++++++++-------
>  tools/perf/builtin-trace.c            |  41 +--
>  tools/perf/util/Build                 |   1 +
>  tools/perf/util/bpf_lock_contention.c |   8 +-
>  tools/perf/util/machine.c             | 344 +++++++-------------------
>  tools/perf/util/machine.h             |  30 +--
>  tools/perf/util/rb_resort.h           |   5 -
>  tools/perf/util/thread.c              |   2 +-
>  tools/perf/util/thread.h              |   6 -
>  tools/perf/util/threads.c             | 186 ++++++++++++++
>  tools/perf/util/threads.h             |  35 +++
>  11 files changed, 464 insertions(+), 397 deletions(-)
>  create mode 100644 tools/perf/util/threads.c
>  create mode 100644 tools/perf/util/threads.h

Arnaldo/Namhyung, anything outstanding that needs addressing in a v2?
I'm looking for reviewed-by/acked-by tags :-)

Thanks,
Ian

> --
> 2.43.0.687.g38aa6559b0-goog
>