From: Andrea Arcangeli <andrea@suse.de>
To: linux-kernel@vger.kernel.org
Cc: jeremy@classic.engr.sgi.com
Subject: o_direct-11 and blkdev-pagecache-8
Date: Thu, 2 Aug 2001 15:05:29 +0200 [thread overview]
Message-ID: <20010802150529.A24436@athlon.random> (raw)
Here the latest release against 2.4.8pre3.
For the blkdev-pagecache I decreased performance going to 1k I/O
granularity to provide total backwards compatibility, otherwise it was
not possible to read the last bytes of the device if the size of the
device was not a multiple of 4k and there's no way to work around that
without intensive changes :(, this in turn means the doing O_DIRECT on
the blkdevice now has a constraint of 1k I/O granularity on the
read/write API (not anymore the more restrictive 4k granularity).
The O_DIRECT patch includes a one liner I got from the GFS folks to
update the i_size of the inode correctly.
They must be applyed in order:
ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/patches/v2.4/2.4.8pre3/o_direct-11
ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/patches/v2.4/2.4.8pre3/blkdev-pagecache-8
Now it would be nice to have a patch incremental to those so that rawio
also uses the preallocated per-file iobuf (note: the preallocation
should happen in the rawio layer, not in the vfs like we just do with
the generic O_DIRECT).
Andrea
next reply other threads:[~2001-08-02 13:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-02 13:05 Andrea Arcangeli [this message]
2001-08-05 16:28 ` blkdev-pagecache-11 Andrea Arcangeli
2001-08-05 16:29 ` blkdev-pagecache-11 Andrea Arcangeli
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