linux-kernel - Re: [patch 00/11] rseq: Optimize exit to user space

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Message-ID: <87bjoi7vqx.ffs@tglx>
Date: Wed, 13 Aug 2025 23:32:54 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Jens Axboe <axboe@...nel.dk>, LKML <linux-kernel@...r.kernel.org>
Cc: Michael Jeanson <mjeanson@...icios.com>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Peter Zijlstra <peterz@...radead.org>,
 "Paul E. McKenney" <paulmck@...nel.org>, Boqun Feng
 <boqun.feng@...il.com>, Wei Liu <wei.liu@...nel.org>
Subject: Re: [patch 00/11] rseq: Optimize exit to user space

On Wed, Aug 13 2025 at 11:45, Jens Axboe wrote:
> On 8/13/25 10:29 AM, Thomas Gleixner wrote:
>> 
>> suffered badly from the stale eventmask bits and the cleaned up version
>> brought a whopping 25+% performance gain.
>
> Thanks for doing this work, it's been on my list to take a look at rseq
> as it's quite the pig currently and enabled by default (with what I
> assume is from a newer libc).

Yes, recent glibc uses it.

Could you give it a test ride to see whether this makes a difference in
your environment?

Thanks

        tglx