From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To: Jan Kara <jack@suse.cz>
Cc: "Darrick J. Wong" <djwong@us.ibm.com>,
Theodore Tso <tytso@mit.edu>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Jens Axboe <axboe@kernel.dk>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Jeff Layton <jlayton@redhat.com>,
Dave Chinner <david@fromorbit.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Christoph Hellwig <hch@infradead.org>,
linux-mm@kvack.org, Chris Mason <chris.mason@oracle.com>,
Joel Becker <jlbec@evilplan.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-ext4@vger.kernel.org, Mingming Cao <mcao@us.ibm.com>
Subject: Re: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses
Date: Tue, 10 May 2011 22:46:16 +0900 [thread overview]
Message-ID: <878vue4qjb.fsf@devron.myhome.or.jp> (raw)
In-Reply-To: <20110510132953.GE4402@quack.suse.cz> (Jan Kara's message of "Tue, 10 May 2011 15:29:53 +0200")
Jan Kara <jack@suse.cz> writes:
>> I see. So many block layer stuff sounds like broken on corner case? If
>> so, I more feel this approach should be temporary workaround, and should
>> use another less-blocking approach.
> Not many but some... The alternative to less blocking approach is to do
> copy-out before a page is submitted for IO (or various middle ground
> alternatives of doing sometimes copyout, sometimes blocking...). That costs
> some performance as well. We talked about it at LSF and the approach
> Darrick is implementing was considered the least intrusive. There's really
> no way to fix these corner cases and keep performance.
You already considered, to copy only if page was writeback (like
copy-on-write). I.e. if page is on I/O, copy, then switch the page for
writing new data.
Yes, it is complex. But I think blocking and overhead is minimum, and
this can be used as infrastructure for copy-on-write FS.
Thanks.
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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next prev parent reply other threads:[~2011-05-10 13:46 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-09 23:03 [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses Darrick J. Wong
2011-05-09 23:03 ` [PATCH 1/7] mm: Wait for writeback when grabbing pages to begin a write Darrick J. Wong
2011-05-09 23:03 ` [PATCH 2/7] fs: block_page_mkwrite should wait for writeback to finish Darrick J. Wong
2011-05-10 12:41 ` Jan Kara
2011-05-10 17:12 ` Darrick J. Wong
2011-05-09 23:03 ` [PATCH 3/7] mm: Provide stub page_mkwrite functionality to stabilize pages during writes Darrick J. Wong
2011-05-09 23:03 ` [PATCH 4/7] ext4: Clean up some wait_on_page_writeback calls Darrick J. Wong
2011-05-18 18:16 ` [4/7] " Ted Ts'o
2011-05-09 23:03 ` [PATCH 5/7] ext4: Wait for writeback to complete while making pages writable Darrick J. Wong
2011-05-18 18:17 ` [5/7] " Ted Ts'o
2011-05-09 23:04 ` [PATCH 6/7] ext2: Lock buffer_head during metadata update Darrick J. Wong
2011-05-09 23:04 ` [PATCH 7/7] fat: Lock buffer_head during metadata updates Darrick J. Wong
2011-05-10 0:06 ` [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses Dave Chinner
2011-05-10 1:59 ` OGAWA Hirofumi
2011-05-10 12:38 ` Jan Kara
2011-05-10 13:12 ` OGAWA Hirofumi
2011-05-10 13:29 ` Jan Kara
2011-05-10 13:46 ` OGAWA Hirofumi [this message]
2011-05-10 14:05 ` OGAWA Hirofumi
2011-05-10 14:54 ` Jan Kara
2011-05-10 16:12 ` OGAWA Hirofumi
2011-05-10 16:22 ` Jan Kara
2011-05-10 16:28 ` OGAWA Hirofumi
2011-05-16 18:47 ` Darrick J. Wong
2011-05-16 19:31 ` OGAWA Hirofumi
2011-05-17 1:23 ` Darrick J. Wong
2011-05-17 3:30 ` OGAWA Hirofumi
2011-10-23 16:38 ` Andy Lutomirski
2011-05-10 13:36 ` Christoph Hellwig
2011-05-10 13:52 ` OGAWA Hirofumi
2011-05-10 14:49 ` Jan Kara
2011-05-10 15:24 ` OGAWA Hirofumi
2011-05-10 16:18 ` Jan Kara
2011-05-10 16:29 ` OGAWA Hirofumi
2011-05-10 17:03 ` Jan Kara
2011-05-10 17:03 ` Christoph Hellwig
2011-05-10 20:50 ` OGAWA Hirofumi
2011-05-11 5:55 ` Christoph Hellwig
2011-05-11 9:36 ` OGAWA Hirofumi
2011-05-10 12:51 ` Jan Kara
2011-05-10 16:24 ` Chris Mason
2011-05-11 18:19 ` Darrick J. Wong
2011-05-12 9:42 ` Jan Kara
2011-05-16 18:49 ` Darrick J. Wong
2011-05-16 18:59 ` Jan Kara
2011-05-16 19:09 ` Darrick J. Wong
2011-05-16 19:04 ` Darrick J. Wong
2011-05-16 20:27 ` Christoph Hellwig
2011-05-16 20:55 ` Darrick J. Wong
2011-05-17 14:01 ` Christoph Hellwig
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