linux-kernel - Re: [RFC PATCH v4 00/25] RSEQ node id and virtual cpu id extensions

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Message-ID: <YywYWSIocrDDntq3@hirez.programming.kicks-ass.net>
Date:   Thu, 22 Sep 2022 10:10:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     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, Christian Brauner <brauner@...nel.org>,
        Florian Weimer <fw@...eb.enyo.de>, David.Laight@...lab.com,
        carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>
Subject: Re: [RFC PATCH v4 00/25] RSEQ node id and virtual cpu id extensions

On Wed, Sep 21, 2022 at 03:54:18PM -0400, Mathieu Desnoyers wrote:
> On 2022-09-21 15:24, Mathieu Desnoyers wrote:
> > Extend the rseq ABI to expose a NUMA node ID and a vm_vcpu_id field.
> > 
> > The NUMA node ID field allows implementing a faster getcpu(2) in libc.
> > 
> > The virtual cpu id allows ideal scaling (down or up) of user-space
> > per-cpu data structures. The virtual cpu ids allocated within a memory
> > space are tracked by the scheduler, which takes into account the number
> > of concurrently running threads, thus implicitly considering the number
> > of threads, the cpu affinity, the cpusets applying to those threads, and
> > the number of logical cores on the system.
> > 
> > This series is based on the v5.19 tag.
> 
> Hi Peter,
> 
> I'm having MTA issues at the moment. I will resend the series as soon as I
> can get hold of my sysadmin.

It landed in my inbox and Lore seems to have received a copy too; as
per:

  https://lkml.kernel.org/r/14ba275f-8ddc-33fc-2669-1c336436f473@efficios.com

So I'm thinking you did manage to send out mail and all is well.

I'll try and have a look later today.