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

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Message-ID: <e6906764-66bb-437d-8082-b1d6a48ffa55@efficios.com>
Date: Mon, 18 Aug 2025 13:38:34 -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 2025-08-17 17:23, Thomas Gleixner wrote:
> Michael, can you please run your librseq tests against that too? They
> have the same segfault problem as the kernel and they lack a run script,
> so I couldn't be bothered to test against them. See commit 2bff3a0e5998
> in that branch. I'll send out a patch with a proper change log later.

I ran the librseq test suite on the new branch on a Debian Trixie amd64 
system and it succeeds, here are the rseq stats before and after.

Before:

exit:             746809
signal:                3
slowp:                99
ids:                1053
cs:                    0
clear:                 0
fixup:                 0

After:

exit:          229294046
signal:               11
slowp:              4570
ids:              615950
cs:              2493682
clear:            194637
fixup:           2299044

And I also ran the same test suite in a 32bit chroot on the same system 
which also succeeds with the following rseq stats.

Before:

exit:             717945
signal:                1
slowp:               102
ids:                1039
cs:                    0
clear:                 0
fixup:                 0

After:

exit:          201051038
signal:                9
slowp:              4909
ids:              793551
cs:                28887
clear:             12871
fixup:             16016

If you want to run the librseq tests on your system, just do the regular 
autotools dance and then run 'make check'.

Regards,

Michael