From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: "André Almeida" <andrealmeid@igalia.com>
Cc: Juri Lelli <juri.lelli@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Darren Hart <dvhart@infradead.org>,
Davidlohr Bueso <dave@stgolabs.net>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Valentin Schneider <vschneid@redhat.com>,
Waiman Long <longman@redhat.com>
Subject: Re: Futex hash_bucket lock can break isolation and cause priority inversion on RT
Date: Tue, 8 Oct 2024 20:09:11 +0200 [thread overview]
Message-ID: <20241008180911.JiqZxSLg@linutronix.de> (raw)
In-Reply-To: <46c259c2-5503-4a63-94ae-96660e5ce0eb@igalia.com>
On 2024-10-08 12:59:24 [-0300], André Almeida wrote:
>
> So if every process has it owns hb-lock, every process has their own bucket?
> It would act just like a linked list then?
If you have one hb-lock, yes. But you could have 4 or 8 slots. A slot
has 64 bytes due to alignment. As-is the 8 slots would occupy 512 bytes
of memory.
Sebastian
next prev parent reply other threads:[~2024-10-08 18:09 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-08 15:22 Futex hash_bucket lock can break isolation and cause priority inversion on RT Juri Lelli
2024-10-08 15:38 ` André Almeida
2024-10-08 15:51 ` Sebastian Andrzej Siewior
2024-10-08 15:59 ` André Almeida
2024-10-08 18:09 ` Sebastian Andrzej Siewior [this message]
2024-10-09 8:36 ` Juri Lelli
2024-10-24 22:36 ` Thomas Gleixner
2024-10-08 17:38 ` Peter Zijlstra
2024-10-08 19:44 ` Waiman Long
2024-10-09 7:22 ` Peter Zijlstra
2024-10-09 8:26 ` Juri Lelli
2024-10-08 18:30 ` Waiman Long
2024-10-09 8:28 ` Juri Lelli
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