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Message-ID: <20241028121921.1264150-1-bigeasy@linutronix.de>
Date: Mon, 28 Oct 2024 13:13:54 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: André Almeida <andrealmeid@...lia.com>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>
Subject: [RFC v2 PATCH 0/4] futex: Add support task local hash maps.

Hi,

this is a follow up on
	https://lore.kernel.org/ZwVOMgBMxrw7BU9A@jlelli-thinkpadt14gen4.remote.csb

and adds support for task local futex_hash_bucket. It can be created via
prctl(). Last patch in the series enables it one the first thread is
created.

I've been how this auto-create behaves and so far dpkg creates threads
and uses the local-hashmap. systemd-journal on the hand forks a thread
from time to time and I haven't seen it using the hashmap. Need to do
more testing.

v1…v2 https://lore.kernel.org/all/20241026224306.982896-1-bigeasy@linutronix.de/:
  - Moved to struct signal_struct and is used process wide.
  - Automaticly allocated once the first thread is created.

Sebastian

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