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From: Linus Torvalds <torvalds@linux-foundation.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Christoph Lameter <cl@linux-foundation.org>,
	Arjan van de Ven <arjan@infradead.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"minchan.kim@gmail.com" <minchan.kim@gmail.com>,
	"hugh.dickins" <hugh.dickins@tiscali.co.uk>,
	Nick Piggin <nickpiggin@yahoo.com.au>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()
Date: Thu, 7 Jan 2010 16:39:27 -0800 (PST)	[thread overview]
Message-ID: <alpine.LFD.2.00.1001071634500.7821@localhost.localdomain> (raw)
In-Reply-To: <20100108092333.1040c799.kamezawa.hiroyu@jp.fujitsu.com>



On Fri, 8 Jan 2010, KAMEZAWA Hiroyuki wrote:
> 
> Hmm, do_brk() sometimes unmap conflicting mapping. Isn't it be a problem ?

No. For two reasons:

 - sys_brk() doesn't actually do that (see the "find_vma_intersection()" 
   call). I'm not sure why do_brk() does, but it might have to do with 
   execve().

 - the patch I sent out just falls back to the old code if it finds 
   something fishy, so it will do whatever do_brk() does regardless.

(Yes, brk() does unmap the old brk for the _shrinking_ case, of course. 
Again, the patch I sent just falls back to the old behavior in that case)

		Linus

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  parent reply	other threads:[~2010-01-08  0:39 UTC|newest]

Thread overview: 121+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-04 18:24 [RFC][PATCH 0/8] Speculative pagefault -v3 Peter Zijlstra
2010-01-04 18:24 ` [RFC][PATCH 1/8] mm: Remove pte reference from fault path Peter Zijlstra
2010-01-04 18:24 ` [RFC][PATCH 2/8] mm: Speculative pagefault infrastructure Peter Zijlstra
2010-01-04 18:24 ` [RFC][PATCH 3/8] mm: Add vma sequence count Peter Zijlstra
2010-01-04 18:24 ` [RFC][PATCH 4/8] mm: RCU free vmas Peter Zijlstra
2010-01-05  2:43   ` Paul E. McKenney
2010-01-05  8:28     ` Peter Zijlstra
2010-01-05 16:05       ` Paul E. McKenney
2010-01-04 18:24 ` [RFC][PATCH 5/8] mm: Speculative pte_map_lock() Peter Zijlstra
2010-01-04 18:24 ` [RFC][PATCH 6/8] mm: handle_speculative_fault() Peter Zijlstra
2010-01-05  0:25   ` KAMEZAWA Hiroyuki
2010-01-05  3:13     ` Linus Torvalds
2010-01-05  8:17       ` Peter Zijlstra
2010-01-05  8:57       ` Peter Zijlstra
2010-01-05 15:34         ` Linus Torvalds
2010-01-05 15:40           ` Al Viro
2010-01-05 16:10             ` Linus Torvalds
2010-01-06 15:41               ` Peter Zijlstra
2010-01-05  9:37       ` Peter Zijlstra
2010-01-05 23:35         ` Linus Torvalds
2010-01-05  4:29     ` Minchan Kim
2010-01-05  4:43       ` KAMEZAWA Hiroyuki
2010-01-05  5:10         ` Linus Torvalds
2010-01-05  5:30           ` KAMEZAWA Hiroyuki
2010-01-05  7:39             ` KAMEZAWA Hiroyuki
2010-01-05 15:26               ` Linus Torvalds
2010-01-05 16:14                 ` Linus Torvalds
2010-01-05 17:25                   ` Andi Kleen
2010-01-05 17:47                     ` Christoph Lameter
2010-01-05 18:00                       ` Andi Kleen
2010-01-05 17:55                     ` Linus Torvalds
2010-01-05 18:13                       ` Christoph Lameter
2010-01-05 18:25                         ` Linus Torvalds
2010-01-05 18:46                           ` Christoph Lameter
2010-01-05 18:56                             ` Linus Torvalds
2010-01-05 19:15                               ` Christoph Lameter
2010-01-05 19:28                                 ` Linus Torvalds
2010-01-05 18:55                           ` Paul E. McKenney
2010-01-05 19:08                             ` Linus Torvalds
2010-01-05 19:23                               ` Paul E. McKenney
2010-01-05 20:29                           ` Peter Zijlstra
2010-01-05 20:46                             ` Linus Torvalds
2010-01-05 21:00                               ` Linus Torvalds
2010-01-05 23:29                             ` Paul E. McKenney
2010-01-06  0:22                 ` KAMEZAWA Hiroyuki
2010-01-06  1:37                   ` Linus Torvalds
2010-01-06  2:52                     ` KAMEZAWA Hiroyuki
2010-01-06  3:27                       ` Linus Torvalds
2010-01-06  3:56                         ` KAMEZAWA Hiroyuki
2010-01-06  4:20                           ` Linus Torvalds
2010-01-06  7:06                             ` KAMEZAWA Hiroyuki
2010-01-06  7:49                               ` Minchan Kim
2010-01-06  9:39                               ` Linus Torvalds
2010-01-07  1:00                                 ` KAMEZAWA Hiroyuki
2010-01-08 16:53                             ` Peter Zijlstra
2010-01-08 17:22                               ` Linus Torvalds
2010-01-08 17:43                                 ` Christoph Lameter
2010-01-08 17:52                                   ` Linus Torvalds
2010-01-08 18:33                                     ` Christoph Lameter
2010-01-08 18:46                                   ` Andi Kleen
2010-01-08 18:56                                     ` Christoph Lameter
2010-01-08 19:10                                       ` Andi Kleen
2010-01-08 19:11                                       ` Linus Torvalds
2010-01-08 19:28                                         ` Andi Kleen
2010-01-08 19:39                                           ` Linus Torvalds
2010-01-08 19:42                                             ` Linus Torvalds
2010-01-08 21:36                                   ` Linus Torvalds
2010-01-08 21:46                                     ` Christoph Lameter
2010-01-08 22:43                                       ` Linus Torvalds
2010-01-08 22:43                                       ` Linus Torvalds
2010-01-09 14:47                               ` Ed Tomlinson
2010-01-10  5:27                                 ` Nitin Gupta
2010-01-05 15:14             ` Christoph Lameter
2010-01-05  8:18           ` Peter Zijlstra
2010-01-05  6:00         ` Minchan Kim
2010-01-05  4:48       ` Linus Torvalds
2010-01-05  6:09         ` Minchan Kim
2010-01-05  6:09           ` KAMEZAWA Hiroyuki
2010-01-05  6:24             ` Minchan Kim
2010-01-05  8:35           ` Peter Zijlstra
2010-01-05 13:45   ` Arjan van de Ven
2010-01-05 14:15     ` Andi Kleen
2010-01-05 15:17     ` Christoph Lameter
2010-01-06  3:22       ` Arjan van de Ven
2010-01-07 16:11         ` Christoph Lameter
2010-01-07 16:19           ` Linus Torvalds
2010-01-07 16:31             ` Linus Torvalds
2010-01-07 16:34             ` Paul E. McKenney
2010-01-07 16:36             ` Christoph Lameter
2010-01-08  4:49               ` Arjan van de Ven
2010-01-08  5:00                 ` Linus Torvalds
2010-01-08 15:51                 ` Christoph Lameter
2010-01-09 15:55                   ` Arjan van de Ven
2010-01-07 17:22             ` Peter Zijlstra
2010-01-07 17:36               ` Linus Torvalds
2010-01-07 17:49                 ` Linus Torvalds
2010-01-07 18:00                   ` Peter Zijlstra
2010-01-07 18:15                     ` Linus Torvalds
2010-01-07 21:49                       ` Peter Zijlstra
2010-01-07 18:44                   ` Linus Torvalds
2010-01-07 19:20                     ` Paul E. McKenney
2010-01-07 20:06                       ` Linus Torvalds
2010-01-07 20:25                         ` Paul E. McKenney
2010-01-07 19:24                     ` Christoph Lameter
2010-01-07 20:08                       ` Linus Torvalds
2010-01-07 20:13                         ` Linus Torvalds
2010-01-07 21:44                     ` Peter Zijlstra
2010-01-07 22:33                       ` Linus Torvalds
2010-01-08  0:23                         ` KAMEZAWA Hiroyuki
2010-01-08  0:25                           ` KAMEZAWA Hiroyuki
2010-01-08  0:39                           ` Linus Torvalds [this message]
2010-01-08  0:41                             ` Linus Torvalds
2010-01-07 23:51                 ` Rik van Riel
2010-01-04 18:24 ` [RFC][PATCH 7/8] mm,x86: speculative pagefault support Peter Zijlstra
2010-01-04 18:24 ` [RFC][PATCH 8/8] mm: Optimize pte_map_lock() Peter Zijlstra
2010-01-04 21:41 ` [RFC][PATCH 0/8] Speculative pagefault -v3 Rik van Riel
2010-01-04 21:46   ` Peter Zijlstra
2010-01-04 23:20     ` Rik van Riel
2010-01-04 21:59   ` Christoph Lameter
2010-01-05  0:28     ` KAMEZAWA Hiroyuki
2010-01-05  2:26 ` Minchan Kim

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