linux-kernel - Re: [RFC PATCH v2 1/4] rseq: Add sched

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Message-ID: <20230928142628.GC27245@noisy.programming.kicks-ass.net>
Date:   Thu, 28 Sep 2023 16:26:28 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     David Laight <David.Laight@...lab.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        "H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        Christian Brauner <brauner@...nel.org>,
        Florian Weimer <fw@...eb.enyo.de>,
        "carlos@...hat.com" <carlos@...hat.com>,
        Peter Oskolkov <posk@...k.io>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Chris Kennelly <ckennelly@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida <andrealmeid@...lia.com>,
        "libc-alpha@...rceware.org" <libc-alpha@...rceware.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jonathan Corbet <corbet@....net>,
        Noah Goldstein <goldstein.w.n@...il.com>,
        Daniel Colascione <dancol@...gle.com>,
        "longman@...hat.com" <longman@...hat.com>,
        Florian Weimer <fweimer@...hat.com>
Subject: Re: [RFC PATCH v2 1/4] rseq: Add sched_state field to struct rseq

On Thu, Sep 28, 2023 at 09:20:36AM -0400, Mathieu Desnoyers wrote:

> Of course things are more complicated with PI-futex, is that what you have
> in mind ?

PI futex has to go through the kernel, also, they already spin-wait on
owner.