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From: Thomas Gleixner <tglx@linutronix.de>
To: Jens Axboe <axboe@kernel.dk>, LKML <linux-kernel@vger.kernel.org>
Cc: Michael Jeanson <mjeanson@efficios.com>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Boqun Feng <boqun.feng@gmail.com>, Wei Liu <wei.liu@kernel.org>
Subject: Re: [patch 00/11] rseq: Optimize exit to user space
Date: Wed, 13 Aug 2025 23:32:54 +0200	[thread overview]
Message-ID: <87bjoi7vqx.ffs@tglx> (raw)
In-Reply-To: <12342355-b3fb-4e78-ad5b-dcfff1366ccf@kernel.dk>

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


  reply	other threads:[~2025-08-13 21:32 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-13 16:29 [patch 00/11] rseq: Optimize exit to user space Thomas Gleixner
2025-08-13 16:29 ` [patch 01/11] rseq: Avoid pointless evaluation in __rseq_notify_resume() Thomas Gleixner
2025-08-20 14:23   ` Mathieu Desnoyers
2025-08-13 16:29 ` [patch 02/11] rseq: Condense the inline stubs Thomas Gleixner
2025-08-20 14:24   ` Mathieu Desnoyers
2025-08-13 16:29 ` [patch 03/11] rseq: Rename rseq_syscall() to rseq_debug_syscall_exit() Thomas Gleixner
2025-08-20 14:25   ` Mathieu Desnoyers
2025-08-13 16:29 ` [patch 04/11] rseq: Replace the pointless event mask bit fiddling Thomas Gleixner
2025-08-13 16:29 ` [patch 05/11] rseq: Optimize the signal delivery path Thomas Gleixner
2025-08-13 16:29 ` [patch 06/11] rseq: Optimize exit to user space further Thomas Gleixner
2025-08-13 16:29 ` [patch 07/11] entry: Cleanup header Thomas Gleixner
2025-08-13 17:09   ` Giorgi Tchankvetadze
2025-08-13 21:30     ` Thomas Gleixner
2025-08-13 16:29 ` [patch 08/11] entry: Distinguish between syscall and interrupt exit Thomas Gleixner
2025-08-13 16:29 ` [patch 09/11] entry: Provide exit_to_user_notify_resume() Thomas Gleixner
2025-08-13 16:29 ` [patch 10/11] rseq: Skip fixup when returning from a syscall Thomas Gleixner
2025-08-14  8:54   ` Peter Zijlstra
2025-08-14 13:24     ` Thomas Gleixner
2025-08-13 16:29 ` [patch 11/11] rseq: Convert to masked user access where applicable Thomas Gleixner
2025-08-13 17:45 ` [patch 00/11] rseq: Optimize exit to user space Jens Axboe
2025-08-13 21:32   ` Thomas Gleixner [this message]
2025-08-13 21:36     ` Jens Axboe
2025-08-13 22:08       ` Thomas Gleixner
2025-08-17 21:23         ` Thomas Gleixner
2025-08-18 14:00           ` BUG: rseq selftests and librseq vs. glibc fail Thomas Gleixner
2025-08-18 14:15             ` Florian Weimer
2025-08-18 17:13               ` Thomas Gleixner
2025-08-18 19:33                 ` Florian Weimer
2025-08-18 19:46                   ` Sean Christopherson
2025-08-18 19:55                     ` Florian Weimer
2025-08-18 20:27                       ` Sean Christopherson
2025-08-18 23:54                         ` Thomas Gleixner
2025-08-19  0:28                           ` Sean Christopherson
2025-08-19  6:18                             ` Florian Weimer
2025-08-29 18:44                 ` Prakash Sangappa
2025-08-29 18:50                   ` Mathieu Desnoyers
2025-09-01 19:30                     ` Prakash Sangappa
2025-08-18 17:38           ` [patch 00/11] rseq: Optimize exit to user space Michael Jeanson
2025-08-18 20:21             ` Thomas Gleixner
2025-08-18 21:29               ` Michael Jeanson
2025-08-18 23:43                 ` Thomas Gleixner
2025-08-20 14:27           ` Mathieu Desnoyers
2025-08-20 14:10 ` Mathieu Desnoyers

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