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From: Badari Pulavarty <pbadari@gmail.com>
To: kamezawa.hiroyu@jp.fujitsu.com
Cc: Christoph Lameter <clameter@sgi.com>,
	Nick Piggin <npiggin@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, GOTO <y-goto@jp.fujitsu.com>
Subject: Re: Re: Warning on memory offline (and possible in usual migration?)
Date: Wed, 30 Apr 2008 17:34:18 -0700	[thread overview]
Message-ID: <1209602058.27240.4.camel@badari-desktop> (raw)
In-Reply-To: <28073963.1209598183931.kamezawa.hiroyu@jp.fujitsu.com>

On Thu, 2008-05-01 at 08:29 +0900, kamezawa.hiroyu@jp.fujitsu.com wrote:
> >
> >One issue that I am still not clear on is (in particular for memory 
> >offline) is how exactly to determine if a page is under read I/O. I 
> >initially thought simply checking for PageUptodate would do the trick.
> >
> All troublesome case I found was "write". In my understanding,
> at generic bufferted file write, xxx_write_begin() -> write -> xxx_write_end()
>  sequence is used. xxx_write_begin locks a page and xxx_write_end unlock it. 
> (and xxx_write_end() set a page to be Uptodate in usual case.)
> So,it seems we can depend on that a page is locked or not.

You can wait for PG_writeback to be cleared to wait for IO to finish.

Thanks,
Badari

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  reply	other threads:[~2008-05-01  0:34 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-04-14  5:58 Warning on memory offline (and possible in usual migration?) KAMEZAWA Hiroyuki
2008-04-14 17:46 ` Christoph Lameter
2008-04-15 10:13   ` KAMEZAWA Hiroyuki
2008-04-15 19:31     ` Christoph Lameter
2008-04-16  0:23       ` KAMEZAWA Hiroyuki
2008-04-16  2:23         ` KAMEZAWA Hiroyuki
2008-04-16  3:10           ` KAMEZAWA Hiroyuki
2008-04-16  5:22             ` KAMEZAWA Hiroyuki
2008-04-16 18:04             ` Christoph Lameter
2008-04-16 11:00   ` KAMEZAWA Hiroyuki
2008-04-16 18:36     ` Andrew Morton
2008-04-17  0:19       ` KAMEZAWA Hiroyuki
2008-04-17  6:38         ` Warning on memory offline (possible in migration ?) KAMEZAWA Hiroyuki
2008-04-17  6:38           ` KAMEZAWA Hiroyuki
2008-04-17  6:43           ` Andrew Morton
2008-04-17  6:43             ` Andrew Morton
2008-04-17  6:55             ` KAMEZAWA Hiroyuki
2008-04-17  6:55               ` KAMEZAWA Hiroyuki
2008-04-22  4:41       ` Warning on memory offline (and possible in usual migration?) Nick Piggin
2008-04-22  4:52   ` Nick Piggin
2008-04-22  7:56     ` KAMEZAWA Hiroyuki
2008-04-22  9:43       ` Nick Piggin
2008-04-22  9:57         ` KAMEZAWA Hiroyuki
2008-04-22 19:16         ` Christoph Lameter
2008-04-23  0:48           ` Nick Piggin
2008-04-23  1:37             ` KAMEZAWA Hiroyuki
2008-04-23  2:41             ` KAMEZAWA Hiroyuki
2008-04-23  2:53               ` Nick Piggin
2008-04-23  3:44                 ` KAMEZAWA Hiroyuki
2008-04-23 15:28                   ` Nick Piggin
2008-04-24  1:34                     ` KAMEZAWA Hiroyuki
2008-04-23 17:50                   ` Christoph Lameter
2008-04-24  1:36                     ` KAMEZAWA Hiroyuki
2008-04-24 19:11                       ` Christoph Lameter
2008-04-25  0:11                         ` KAMEZAWA Hiroyuki
2008-04-23 17:47                 ` Christoph Lameter
2008-04-24  2:13                   ` Nick Piggin
2008-04-29  7:20             ` KAMEZAWA Hiroyuki
2008-04-30  6:56               ` Nick Piggin
2008-04-30  7:04                 ` KAMEZAWA Hiroyuki
2008-04-30  7:12                 ` Andrew Morton
2008-04-30  7:22                   ` KAMEZAWA Hiroyuki
2008-04-30  7:26                   ` Nick Piggin
2008-04-30 17:59                     ` Christoph Lameter
2008-04-30 18:01                     ` Christoph Lameter
2008-04-30 23:29                       ` kamezawa.hiroyu
2008-05-01  0:34                         ` Badari Pulavarty [this message]
2008-05-01  8:36                           ` kamezawa.hiroyu
2008-05-01  1:44                       ` Nick Piggin
2008-05-01 19:25                         ` Christoph Lameter
2008-05-02  0:44                           ` Nick Piggin
2008-05-02  1:07                             ` Christoph Lameter
2008-05-02  1:23                               ` Nick Piggin
2008-05-02  1:37                                 ` Christoph Lameter
2008-05-02 21:16                                   ` Christoph Lameter
2008-05-05  4:27                                     ` Nick Piggin
2008-05-05 17:28                                       ` Christoph Lameter
2008-05-06  8:52                                         ` Nick Piggin
2008-05-06 17:49                                           ` Christoph Lameter
2008-04-22  4:50 ` Nick Piggin

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