From: Szabolcs Nagy <nsz@port70.net>
To: Ingo Molnar <mingo@kernel.org>, Andy Lutomirski <luto@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Borislav Petkov <bp@alien8.de>,
"musl@lists.openwall.com" <musl@lists.openwall.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers
Date: Wed, 9 Mar 2016 12:40:51 +0100 [thread overview]
Message-ID: <20160309114051.GA29662@port70.net> (raw)
In-Reply-To: <20160309113449.GZ29662@port70.net>
* Szabolcs Nagy <nsz@port70.net> [2016-03-09 12:34:50 +0100]:
> * Ingo Molnar <mingo@kernel.org> [2016-03-09 09:56:31 +0100]:
> > Why is so much complexity added to avoid a ~3 instructions window where
> > calcellation is tested? Cancellation at work atom boundaries is a fundamentally
> > 'polling' model anyway, and signal delivery is asynchronous, with a fundamental
> > IPI delay if it's cross-CPU.
> >
>
> to avoid the race when the thread is cancelled after the test but before
> the syscall see http://ewontfix.com/16/
>
wrong link
http://ewontfix.com/2/
next prev parent reply other threads:[~2016-03-09 11:41 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-09 1:24 [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski
2016-03-09 8:56 ` Ingo Molnar
2016-03-09 11:34 ` [musl] " Szabolcs Nagy
2016-03-09 11:40 ` Szabolcs Nagy [this message]
2016-03-09 19:47 ` Linus Torvalds
2016-03-09 20:57 ` Andy Lutomirski
2016-03-09 21:26 ` Linus Torvalds
2016-03-10 10:57 ` Ingo Molnar
2016-03-10 3:34 ` Rich Felker
2016-03-10 11:16 ` Ingo Molnar
2016-03-10 16:41 ` Rich Felker
2016-03-10 18:03 ` Ingo Molnar
2016-03-10 23:28 ` Rich Felker
2016-03-11 0:18 ` Szabolcs Nagy
2016-03-11 0:48 ` Rich Felker
2016-03-11 1:14 ` Andy Lutomirski
2016-03-11 1:39 ` Szabolcs Nagy
2016-03-11 1:49 ` Szabolcs Nagy
2016-03-11 1:55 ` Rich Felker
2016-03-11 9:33 ` Ingo Molnar
2016-03-11 11:39 ` Szabolcs Nagy
2016-03-11 19:27 ` Linus Torvalds
2016-03-11 19:30 ` Andy Lutomirski
2016-03-11 19:39 ` Linus Torvalds
2016-03-11 19:44 ` Linus Torvalds
2016-03-12 17:05 ` Ingo Molnar
2016-03-12 18:10 ` Rich Felker
2016-03-12 17:00 ` Ingo Molnar
2016-03-12 18:05 ` Rich Felker
2016-03-12 18:48 ` Ingo Molnar
2016-03-12 19:08 ` Rich Felker
2016-03-12 17:08 ` Ingo Molnar
2016-03-09 17:58 ` Andy Lutomirski
2016-03-09 21:19 ` Andy Lutomirski
2016-03-12 18:13 ` Andy Lutomirski
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