From: Peter Zijlstra <peterz@infradead.org>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: dvhart@linux.intel.com, david@rgmadvisors.com,
kyle@moffetthome.net, luto@mit.edu, eric.dumazet@gmail.com,
linux-kernel@vger.kernel.org, sbohrer@rgmadvisors.com,
zvonler@rgmadvisors.com, hughd@google.com, tglx@linutronix.de,
mingo@elte.hu
Subject: Re: Change in functionality of futex() system call.
Date: Thu, 09 Jun 2011 14:05:10 +0200 [thread overview]
Message-ID: <1307621110.3941.78.camel@twins> (raw)
In-Reply-To: <4DF0B072.8060204@jp.fujitsu.com>
On Thu, 2011-06-09 at 20:37 +0900, KOSAKI Motohiro wrote:
> 1) check the pte of the target address is RW attribute.
> 2-1) if yes, it has no COW chance. we can safely use gup result.
> 2-2) if no, we have to fallback slow vma walk. maybe, it's okey.
> both RO mappings and COW are rare situation.
Not so, clean file pages are RO, even if the vma is writable. We use the
fault to track dirty state with.
next prev parent reply other threads:[~2011-06-09 12:05 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-06 14:28 Change in functionality of futex() system call David Oliver
2011-06-06 15:23 ` Eric Dumazet
2011-06-06 15:56 ` Shawn Bohrer
2011-06-06 16:11 ` Peter Zijlstra
2011-06-06 16:16 ` Peter Zijlstra
2011-06-06 16:22 ` Eric Dumazet
2011-06-06 16:29 ` Peter Zijlstra
2011-06-06 16:42 ` Eric Dumazet
2011-06-06 17:05 ` Peter Zijlstra
2011-06-06 17:11 ` Eric Dumazet
2011-06-06 17:27 ` Steven Rostedt
2011-06-06 17:56 ` Darren Hart
2011-06-06 18:23 ` Peter Zijlstra
2011-06-06 18:27 ` Eric Dumazet
2011-06-25 0:00 ` Darren Hart
2011-06-27 16:48 ` Shawn Bohrer
2011-06-06 17:53 ` Darren Hart
2011-06-06 18:11 ` Eric Dumazet
2011-06-07 3:13 ` Darren Hart
2011-06-07 3:49 ` Eric Dumazet
2011-06-07 14:44 ` Andy Lutomirski
2011-06-07 15:56 ` Darren Hart
2011-06-07 15:58 ` Eric Dumazet
2011-06-07 18:43 ` Andrew Lutomirski
2011-06-07 19:01 ` Darren Hart
2011-06-07 19:04 ` Andrew Lutomirski
2011-06-07 19:06 ` Eric Dumazet
2011-06-07 19:10 ` David Oliver
2011-06-07 19:19 ` Andrew Lutomirski
2011-06-07 19:33 ` David Oliver
2011-06-07 19:53 ` Andrew Lutomirski
2011-06-07 20:04 ` David Oliver
2011-06-07 20:12 ` Andrew Lutomirski
2011-06-07 22:26 ` Kyle Moffett
2011-06-08 15:20 ` David Oliver
2011-06-08 15:21 ` Andrew Lutomirski
2011-06-08 16:21 ` Darren Hart
2011-06-09 11:37 ` KOSAKI Motohiro
2011-06-09 12:05 ` Peter Zijlstra [this message]
2011-06-09 17:58 ` Peter Zijlstra
2011-06-10 3:30 ` KOSAKI Motohiro
2011-06-10 3:26 ` KOSAKI Motohiro
2011-06-07 18:30 ` Joel Becker
2011-06-09 12:05 ` Peter Zijlstra
2011-06-10 12:10 ` KOSAKI Motohiro
2011-06-10 17:29 ` Darren Hart
2011-06-13 2:11 ` KOSAKI Motohiro
2011-06-13 15:50 ` Darren Hart
2011-06-15 18:50 ` Shawn Bohrer
2011-06-15 18:54 ` Darren Hart
2011-06-17 13:40 ` Shawn Bohrer
2011-06-22 19:19 ` [PATCH RFC] futex: Fix regression with read only mappings Shawn Bohrer
2011-06-22 20:14 ` Darren Hart
2011-06-23 2:51 ` KOSAKI Motohiro
2011-06-23 15:26 ` Darren Hart
2011-06-23 19:49 ` Shawn Bohrer
2011-06-24 15:59 ` [PATCH v2] " Shawn Bohrer
2011-06-25 0:37 ` Darren Hart
2011-06-25 15:10 ` KOSAKI Motohiro
2011-06-27 16:40 ` Shawn Bohrer
2011-06-27 18:15 ` Peter Zijlstra
2011-06-27 20:41 ` Darren Hart
2011-06-27 21:08 ` Shawn Bohrer
2011-06-27 21:39 ` Darren Hart
2011-06-27 22:14 ` Shawn Bohrer
2011-06-27 23:17 ` Darren Hart
2011-06-27 22:22 ` [PATCH v3] " Shawn Bohrer
2011-06-28 10:54 ` Peter Zijlstra
2011-06-28 14:52 ` Darren Hart
2011-06-28 17:38 ` Shawn Bohrer
2011-06-28 20:58 ` Darren Hart
2011-06-28 23:55 ` Darren Hart
2011-06-29 14:56 ` Shawn Bohrer
2011-06-29 15:17 ` [PATCH v4] " Shawn Bohrer
2011-06-29 18:41 ` Darren Hart
2011-06-29 23:38 ` Thomas Gleixner
2011-06-30 4:19 ` Darren Hart
2011-06-30 14:02 ` David C. Oliver
2011-06-30 15:41 ` Darren Hart
2011-06-30 16:21 ` [PATCH v5] " Shawn Bohrer
2011-07-12 15:27 ` Shawn Bohrer
2011-07-25 15:20 ` Shawn Bohrer
2011-07-25 19:28 ` Thomas Gleixner
2011-07-26 19:04 ` [tip:core/urgent] " tip-bot for Shawn Bohrer
2011-06-28 10:50 ` [PATCH v2] " Peter Zijlstra
2011-06-28 14:19 ` Darren Hart
2011-06-28 14:23 ` Peter Zijlstra
2011-06-23 3:58 ` [PATCH RFC] " Shawn Bohrer
2011-06-23 3:23 ` Change in functionality of futex() system call KOSAKI Motohiro
-- strict thread matches above, loose matches on Subject: below --
2011-06-09 0:44 George Spelvin
2011-06-09 3:02 ` Darren Hart
2011-06-09 3:38 ` Andrew Lutomirski
2011-06-09 3:54 ` Eric Dumazet
2011-06-09 4:10 ` Andrew Lutomirski
2011-06-09 5:11 ` Eric Dumazet
2011-06-09 12:12 ` Andrew Lutomirski
2011-06-09 4:43 ` George Spelvin
2011-06-09 5:25 ` Eric Dumazet
2011-06-09 4:44 ` Kyle Moffett
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