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From: Pavel Machek <pavel@ucw.cz>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Florian Weimer <fweimer@redhat.com>, carlos <carlos@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	libc-alpha <libc-alpha@sourceware.org>
Subject: Re: Restartable Sequences system call merged into Linux
Date: Thu, 14 Jun 2018 15:49:59 +0200	[thread overview]
Message-ID: <20180614134959.GA4084@amd> (raw)
In-Reply-To: <956816108.13001.1528983496098.JavaMail.zimbra@efficios.com>

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Hi!

> >> - rseq_preempt(): on preemption, the scheduler sets the TIF_NOTIFY_RESUME thread
> >>   flag, so rseq_handle_notify_resume() can check whether it's in a rseq critical
> >>   section when returning to user-space,
> >> - rseq_signal_deliver(): on signal delivery, rseq_handle_notify_resume() checks
> >>   whether it's in a rseq critical section,
> >> - rseq_migrate: on migration, the scheduler sets TIF_NOTIFY_RESUME as well,
> > 
> > Yes, this is not likely to be noticeable.
> > 
> > But the proposal wanted to add a syscall to thread creation, right?
> > And I believe that may be noticeable.
> 
> Fair point! Do we have a standard benchmark that would stress this ?

Web server performance benchmarks basically test clone() performance
in many cases.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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  reply	other threads:[~2018-06-14 13:50 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-11 19:49 Mathieu Desnoyers
2018-06-11 19:55 ` Florian Weimer
2018-06-11 20:04   ` Mathieu Desnoyers
2018-06-12 13:11     ` Florian Weimer
2018-06-12 16:31       ` Mathieu Desnoyers
2018-06-13  8:21         ` Florian Weimer
2018-06-14 12:27         ` Pavel Machek
2018-06-14 13:01           ` Mathieu Desnoyers
2018-06-14 13:25             ` Pavel Machek
2018-06-14 13:32               ` Florian Weimer
2018-06-14 13:46                 ` Mathieu Desnoyers
2018-06-15  5:10                   ` Florian Weimer
2018-06-15 17:44                     ` Mathieu Desnoyers
2018-06-14 13:38               ` Mathieu Desnoyers
2018-06-14 13:49                 ` Pavel Machek [this message]
2018-06-14 14:00                   ` Florian Weimer
2018-06-14 14:36                     ` Mathieu Desnoyers
2018-06-14 14:41                       ` Florian Weimer
2018-06-14 15:09                         ` Mathieu Desnoyers
2018-06-15  5:09             ` Florian Weimer
2018-06-15 17:50               ` Mathieu Desnoyers
2018-06-15  5:07           ` Florian Weimer
2018-06-13 11:48 ` Heiko Carstens
2018-06-13 16:14   ` Mathieu Desnoyers
2018-06-13 19:53     ` Mathieu Desnoyers

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