From: David Lang <david@lang.hm>
To: Daniel Phillips <daniel@phunq.net>
Cc: Rik van Riel <riel@redhat.com>, Jan Kara <jack@suse.cz>,
linux-fsdevel@vger.kernel.org, tux3@tux3.org,
linux-kernel@vger.kernel.org,
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Subject: Re: [FYI] tux3: Core changes
Date: Wed, 20 May 2015 20:51:46 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.02.1505202050530.25699@nftneq.ynat.uz> (raw)
In-Reply-To: <555D500B.4080901@phunq.net>
On Wed, 20 May 2015, Daniel Phillips wrote:
> On 05/20/2015 03:51 PM, Daniel Phillips wrote:
>> On 05/20/2015 12:53 PM, Rik van Riel wrote:
>>> How does tux3 prevent a user of find_get_page() from reading from
>>> or writing into the pre-COW page, instead of the current page?
>>
>> Careful control of the dirty bits (we have two of them, one each
>> for front and back). That is what pagefork_for_blockdirty is about.
>
> Ah, and of course it does not matter if a reader is on the
> pre-cow page. It would be reading the earlier copy, which might
> no longer be the current copy, but it raced with the write so
> nobody should be surprised. That is a race even without page fork.
how do you prevent it from continuing to interact with the old version of the
page and never see updates or have it's changes reflected on the current page?
David Lang
next prev parent reply other threads:[~2015-05-21 3:52 UTC|newest]
Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-28 23:13 Tux3 Report: How fast can we fsync? Daniel Phillips
2015-04-29 2:21 ` Mike Galbraith
2015-04-29 6:01 ` Daniel Phillips
2015-04-29 6:20 ` Richard Weinberger
2015-04-29 6:56 ` Daniel Phillips
2015-04-29 6:33 ` Mike Galbraith
2015-04-29 7:23 ` Daniel Phillips
2015-04-29 16:42 ` Mike Galbraith
2015-04-29 19:05 ` xfs: does mkfs.xfs require fancy switches to get decent performance? (was Tux3 Report: How fast can we fsync?) Mike Galbraith
2015-04-29 19:20 ` Austin S Hemmelgarn
2015-04-29 21:12 ` Daniel Phillips
2015-04-30 4:40 ` Mike Galbraith
2015-04-30 0:20 ` Dave Chinner
2015-04-30 3:35 ` Mike Galbraith
2015-04-30 9:00 ` Martin Steigerwald
2015-04-30 14:57 ` Theodore Ts'o
2015-04-30 15:59 ` Daniel Phillips
2015-04-30 17:59 ` Martin Steigerwald
2015-04-30 11:14 ` Daniel Phillips
2015-04-30 12:07 ` Mike Galbraith
2015-04-30 12:58 ` Daniel Phillips
2015-04-30 13:48 ` Mike Galbraith
2015-04-30 14:07 ` Daniel Phillips
2015-04-30 14:28 ` Howard Chu
2015-04-30 15:14 ` Daniel Phillips
2015-04-30 16:00 ` Howard Chu
2015-04-30 18:22 ` Christian Stroetmann
2015-05-11 22:12 ` Pavel Machek
2015-05-11 23:17 ` Theodore Ts'o
2015-05-12 2:34 ` Daniel Phillips
2015-05-12 5:38 ` Dave Chinner
2015-05-12 6:18 ` Daniel Phillips
2015-05-12 18:39 ` David Lang
2015-05-12 20:54 ` Daniel Phillips
2015-05-12 21:30 ` David Lang
2015-05-12 22:27 ` Daniel Phillips
2015-05-12 22:35 ` David Lang
2015-05-12 23:55 ` Theodore Ts'o
2015-05-13 1:26 ` Daniel Phillips
2015-05-13 19:09 ` Martin Steigerwald
2015-05-13 19:37 ` Daniel Phillips
2015-05-13 20:02 ` Jeremy Allison
2015-05-13 20:24 ` Daniel Phillips
2015-05-13 20:25 ` Martin Steigerwald
2015-05-13 20:38 ` Daniel Phillips
2015-05-13 21:10 ` Martin Steigerwald
2015-05-13 0:31 ` Daniel Phillips
2015-05-12 21:30 ` Christian Stroetmann
2015-05-13 7:20 ` Pavel Machek
2015-05-13 13:47 ` Elifarley Callado Coelho Cruz
2015-05-12 9:03 ` Pavel Machek
2015-05-12 11:22 ` Daniel Phillips
2015-05-12 13:26 ` Howard Chu
2015-05-11 23:53 ` Daniel Phillips
2015-05-12 0:12 ` David Lang
2015-05-12 4:36 ` Daniel Phillips
2015-05-12 17:30 ` Christian Stroetmann
2015-05-13 7:25 ` Pavel Machek
2015-05-13 11:31 ` Daniel Phillips
2015-05-13 12:41 ` Daniel Phillips
2015-05-13 13:08 ` Mike Galbraith
2015-05-13 13:15 ` Daniel Phillips
2015-04-30 14:33 ` Mike Galbraith
2015-04-30 15:24 ` Daniel Phillips
2015-04-29 20:40 ` Tux3 Report: How fast can we fsync? Daniel Phillips
2015-04-29 22:06 ` OGAWA Hirofumi
2015-04-30 3:57 ` Mike Galbraith
2015-04-30 3:50 ` Mike Galbraith
2015-04-30 10:59 ` Daniel Phillips
2015-04-30 1:46 ` Dave Chinner
2015-04-30 10:28 ` Daniel Phillips
2015-05-01 15:38 ` Dave Chinner
2015-05-01 23:20 ` Daniel Phillips
2015-05-02 1:07 ` David Lang
2015-05-02 10:26 ` Daniel Phillips
2015-05-02 16:00 ` Christian Stroetmann
2015-05-02 16:30 ` Richard Weinberger
2015-05-02 17:00 ` Christian Stroetmann
2015-05-12 17:41 ` Daniel Phillips
2015-05-12 17:46 ` Tux3 Report: How fast can we fail? Daniel Phillips
2015-05-13 22:07 ` Daniel Phillips
2015-05-26 10:03 ` Pavel Machek
2015-05-27 6:41 ` Mosis Tembo
2015-05-27 18:28 ` Daniel Phillips
2015-05-27 21:39 ` Pavel Machek
2015-05-27 22:46 ` Daniel Phillips
2015-05-28 12:55 ` Austin S Hemmelgarn
2015-05-27 7:37 ` Mosis Tembo
2015-05-27 14:04 ` Austin S Hemmelgarn
2015-05-27 15:21 ` Mosis Tembo
2015-05-27 15:37 ` Austin S Hemmelgarn
2015-05-14 7:37 ` [WIP] tux3: Optimized fsync Daniel Phillips
2015-05-14 8:26 ` [FYI] tux3: Core changes Daniel Phillips
2015-05-14 12:59 ` Rik van Riel
2015-05-15 0:06 ` Daniel Phillips
2015-05-15 3:06 ` Rik van Riel
2015-05-15 8:09 ` Mel Gorman
2015-05-15 9:54 ` Daniel Phillips
2015-05-15 11:00 ` Mel Gorman
2015-05-16 22:38 ` David Lang
2015-05-18 12:57 ` Mel Gorman
2015-05-15 9:38 ` Daniel Phillips
2015-05-27 7:41 ` Pavel Machek
2015-05-27 18:09 ` Daniel Phillips
2015-05-27 21:37 ` Pavel Machek
2015-05-27 22:33 ` Daniel Phillips
2015-05-15 8:05 ` Mel Gorman
2015-05-17 13:26 ` Boaz Harrosh
2015-05-18 2:20 ` Rik van Riel
2015-05-18 7:58 ` Boaz Harrosh
2015-05-19 4:46 ` Daniel Phillips
2015-05-21 19:43 ` [WIP][PATCH] tux3: preliminatry nospace handling Daniel Phillips
2015-05-19 14:00 ` [FYI] tux3: Core changes Jan Kara
2015-05-19 19:18 ` Daniel Phillips
2015-05-19 20:33 ` David Lang
2015-05-20 14:44 ` Jan Kara
2015-05-20 16:22 ` Daniel Phillips
2015-05-20 18:01 ` David Lang
2015-05-20 19:53 ` Rik van Riel
2015-05-20 22:51 ` Daniel Phillips
2015-05-21 3:24 ` Daniel Phillips
2015-05-21 3:51 ` David Lang [this message]
2015-05-21 19:53 ` Daniel Phillips
2015-05-26 4:25 ` Rik van Riel
2015-05-26 4:30 ` Daniel Phillips
2015-05-26 6:04 ` David Lang
2015-05-26 6:11 ` Daniel Phillips
2015-05-26 6:13 ` David Lang
2015-05-26 8:09 ` Daniel Phillips
2015-05-26 10:13 ` Pavel Machek
2015-05-26 7:09 ` Jan Kara
2015-05-26 8:08 ` Daniel Phillips
2015-05-26 9:00 ` Jan Kara
2015-05-26 20:22 ` Daniel Phillips
2015-05-26 21:36 ` Rik van Riel
2015-05-26 21:49 ` Daniel Phillips
2015-05-27 8:41 ` Jan Kara
2015-06-21 15:36 ` OGAWA Hirofumi
2015-06-23 16:12 ` Jan Kara
2015-07-05 12:54 ` OGAWA Hirofumi
2015-07-09 16:05 ` Jan Kara
2015-07-31 4:44 ` OGAWA Hirofumi
2015-07-31 15:37 ` Raymond Jennings
2015-07-31 17:27 ` Daniel Phillips
2015-07-31 18:29 ` David Lang
2015-07-31 18:43 ` Daniel Phillips
2015-07-31 22:12 ` Daniel Phillips
2015-07-31 22:27 ` David Lang
2015-08-01 0:00 ` Daniel Phillips
2015-08-01 0:16 ` Daniel Phillips
2015-08-03 13:07 ` Jan Kara
2015-08-01 10:55 ` Elifarley Callado Coelho Cruz
2015-08-18 16:39 ` Rik van Riel
2015-08-03 13:42 ` Jan Kara
2015-08-09 13:42 ` OGAWA Hirofumi
2015-08-10 12:45 ` Jan Kara
2015-08-16 19:42 ` OGAWA Hirofumi
2015-05-26 10:22 ` Sergey Senozhatsky
2015-05-26 12:33 ` Jan Kara
2015-05-26 19:18 ` Daniel Phillips
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