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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f5f862e2-5ce9-4d49-970f-b480cb3e7ba2@efficios.com>
Date: Mon, 18 Aug 2025 17:29:41 -0400
From: Michael Jeanson <mjeanson@...icios.com>
To: Thomas Gleixner <tglx@...utronix.de>, Jens Axboe <axboe@...nel.dk>,
 LKML <linux-kernel@...r.kernel.org>
Cc: 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 2025-08-18 16:21, Thomas Gleixner wrote:
> That looks about right. Can you reset the branch to
> 
>       commit 85b61b265635 ("rseq: Expose stats")
> 
> which is just adding primitive stats on top of the current mainline
> code, and provide numbers for that too?
> 
> That gives you 'notify: , cpuid:, fixup:' numbers, which are not 1:1
> mappable to the final ones, but that should give some interesting
> insight.

For amd64 kernel and userspace.

Before:

notify:             12467
fixup:              12467
cpuid:              12467

After:

notify:         123669528
fixup:          123669528
cpuid:          123669528

For amd64 kernel, i386 userspace.

Before:

notify:             12857
fixup:              12857
cpuid:              12857

After:

notify:         120621210
fixup:          120621210
cpuid:          120621210

> Might be useful to put such instructions into README.md, no?

Will do.

Regards,

Michael