linux-kernel - Re: Restartable Sequences system call merged into Linux

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Message-ID: <20180614134959.GA4084@amd>
Date:   Thu, 14 Jun 2018 15:49:59 +0200
From:   Pavel Machek <pavel@....cz>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Florian Weimer <fweimer@...hat.com>, carlos <carlos@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        libc-alpha <libc-alpha@...rceware.org>
Subject: Re: Restartable Sequences system call merged into Linux

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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