linux-kernel - Re: [RFC PATCH v3 0/9] futex: Add support task local hash maps.

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Message-ID: <20241203182740.NQdnjPBd@linutronix.de>
Date: Tue, 3 Dec 2024 19:27:40 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Juri Lelli <juri.lelli@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	André Almeida <andrealmeid@...lia.com>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>
Subject: Re: [RFC PATCH v3 0/9] futex: Add support task local hash maps.

On 2024-11-29 16:03:54 [+0100], Juri Lelli wrote:
> Hi Sebastian,
Hi Juri,

> On 15/11/24 17:58, Sebastian Andrzej Siewior wrote:
> > 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().
> > 
> > This version supports resize at runtime. This fun part is limited is to
> > FUTEX_LOCK_PI which means any other waiter will break.
> > 
> > I posted performance numbers of "perf bench futex hash"
> > 	https://lore.kernel.org/all/20241101110810.R3AnEqdu@linutronix.de/
> 
> Performance looks generally good on our side as well. However, while
> testing the set manually with a debug enabled config (attached) I hit
> the following BUG (decoded) while booting the machine.

Thanks. That sounds good. Sorry for getting so late back. I posted v4
which fixes the bug you reported.  The new version has auto resizing of
the hash table :)

Sebastian