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Message-ID: <20061231095535.GB1702@flint.arm.linux.org.uk> Date: Sun, 31 Dec 2006 09:55:35 +0000 From: Russell King <rmk+lkml@....linux.org.uk> To: Arjan van de Ven <arjan@...radead.org> Cc: David Miller <davem@...emloft.net>, torvalds@...l.org, miklos@...redi.hu, linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, akpm@...l.org Subject: Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again 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: - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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