From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Arjan van de Ven <arjan@infradead.org>
Cc: David Miller <davem@davemloft.net>,
torvalds@osdl.org, miklos@szeredi.hu,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
akpm@osdl.org
Subject: Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again
Date: Sun, 31 Dec 2006 09:55:35 +0000 [thread overview]
Message-ID: <20061231095535.GB1702@flint.arm.linux.org.uk> (raw)
In-Reply-To: <1167557242.20929.647.camel@laptopd505.fenrus.org>
On Sun, Dec 31, 2006 at 10:27:22AM +0100, Arjan van de Ven wrote:
>
> >
> > However, it's not only FUSE which is suffering - direct-IO also doesn't
> > work.
>
> for direct-IO the kernel won't touch the data *at all*... (that's the
> point ;)
Wrong. One word: PIO. We _still_ to this day have no guarantee by
block device drivers that the data they've read into the page cache
will be flushed into RAM rather than sitting in the CPU cache.
> is it still an issue then?
http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2006-November/036906.html
Depends if you think about that patch I guess. If you're an embedded
person trying to get direct-IO working on ARM I guess that patch is
very attractive, even if it is distasteful to us.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
next prev parent reply other threads:[~2006-12-31 9:55 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-21 15:26 fuse, get_user_pages, flush_anon_page, aliasing caches and all that again Russell King
2006-12-21 15:53 ` Miklos Szeredi
2006-12-21 16:57 ` Russell King
2006-12-21 17:51 ` Miklos Szeredi
2006-12-21 21:04 ` Jan Engelhardt
2006-12-21 21:30 ` Miklos Szeredi
2007-01-01 15:04 ` James Bottomley
2006-12-21 17:17 ` Russell King
2006-12-21 17:55 ` Miklos Szeredi
2006-12-21 18:11 ` Russell King
2006-12-21 18:30 ` Miklos Szeredi
2006-12-21 18:55 ` Russell King
2006-12-21 19:05 ` Miklos Szeredi
2006-12-21 23:51 ` Randolph Chung
2006-12-22 8:43 ` Russell King
2006-12-22 14:45 ` Randolph Chung
2006-12-30 16:39 ` Russell King
2006-12-30 16:50 ` Russell King
2006-12-30 18:26 ` Linus Torvalds
2006-12-30 22:46 ` Russell King
2006-12-31 5:23 ` David Miller
2006-12-31 9:10 ` Miklos Szeredi
2006-12-31 9:45 ` David Miller
2006-12-31 9:23 ` Russell King
2006-12-31 9:27 ` Arjan van de Ven
2006-12-31 9:47 ` David Miller
2006-12-31 10:00 ` Russell King
2006-12-31 10:04 ` David Miller
2006-12-31 12:24 ` Miklos Szeredi
2006-12-31 17:37 ` Russell King
2007-01-01 22:15 ` Miklos Szeredi
2007-01-01 23:45 ` Russell King
2007-01-02 19:40 ` Dan Williams
2007-01-02 22:53 ` James Bottomley
2007-01-02 23:19 ` David Miller
2007-01-02 23:34 ` James Bottomley
2007-01-03 0:20 ` David Miller
2007-01-03 14:16 ` Russell King
2007-01-03 15:00 ` James Bottomley
2007-01-03 15:09 ` Russell King
2007-01-07 16:09 ` James Bottomley
2007-01-07 16:30 ` Russell King
2006-12-31 20:40 ` David Miller
2006-12-31 20:58 ` Linus Torvalds
2006-12-31 21:12 ` David Miller
2007-01-01 16:44 ` James Bottomley
2007-01-01 23:04 ` David Miller
2007-01-01 23:23 ` James Bottomley
[not found] ` <1167669252.5302.57.camel@mulgrave.il.steeleye.com>
2007-01-01 23:01 ` David Miller
2007-01-01 23:17 ` Russell King
2006-12-31 9:55 ` Russell King [this message]
2006-12-31 9:46 ` David Miller
2007-01-01 14:35 ` James Bottomley
2007-01-01 16:21 ` Russell King
2006-12-30 18:21 ` Linus Torvalds
2006-12-21 16:29 ` Arjan van de Ven
2006-12-21 17:35 ` Russell King
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