From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-scsi@vger.kernel.org,
Linux Kernel Development <linux-kernel@vger.kernel.org>,
Alessandro Rubini <rubini@vision.unipv.it>,
Linux/PPC Development <linuxppc-dev@ozlabs.org>,
Paul Mackerras <paulus@samba.org>,
Jens Axboe <jens.axboe@oracle.com>,
Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Subject: Re: [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver
Date: Tue, 17 Jul 2007 07:40:19 +1000 [thread overview]
Message-ID: <1184622019.25235.81.camel@localhost.localdomain> (raw)
In-Reply-To: <1184593643.3447.9.camel@localhost.localdomain>
On Mon, 2007-07-16 at 08:47 -0500, James Bottomley wrote:
>
> No ... that was the point of flush_kernel_dcache_page(). The page in
> question is page cache backed and contains user mappings. However,
> the
> block layer has already done a flush_dcache_page() in get_user_pages()
> and the user shouldn't be touching memory under I/O (unless they want
> self induced aliasing problems) so we're free to assume all the user
> cachelines are purged, hence all we have to do is flush the kernel
> alias
> to bring the page up to date and make the users see it correctly.
Ok. In our case the problem is not aliases though, it's the coherency
between instruction and data caches for pages that may be executed from
(such as swapped out text pages).
Ben.
next prev parent reply other threads:[~2007-07-16 21:40 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-04 13:22 [patch 0/6] PS3 Storage Drivers for 2.6.23, take 4 Geert Uytterhoeven
2007-07-04 13:22 ` [patch 1/6] ps3: Preallocate bootmem memory for the PS3 FLASH ROM storage driver Geert Uytterhoeven
2007-07-04 13:22 ` [patch 2/6] ps3: Storage Driver Core Geert Uytterhoeven
2007-07-04 13:22 ` [patch 3/6] ps3: Storage device registration routines Geert Uytterhoeven
2007-07-04 13:22 ` [patch 4/6] ps3: Disk Storage Driver Geert Uytterhoeven
2007-07-04 13:22 ` [patch 5/6] ps3: BD/DVD/CD-ROM " Geert Uytterhoeven
2007-07-13 13:02 ` James Bottomley
2007-07-13 13:05 ` Jens Axboe
2007-07-13 13:25 ` Geert Uytterhoeven
2007-07-13 13:34 ` James Bottomley
2007-07-13 13:45 ` Geert Uytterhoeven
2007-07-13 14:02 ` James Bottomley
2007-07-13 14:19 ` Arnd Bergmann
2007-07-13 15:10 ` Geert Uytterhoeven
2007-07-13 15:28 ` James Bottomley
2007-07-13 20:13 ` Geert Uytterhoeven
2007-07-16 11:43 ` Geert Uytterhoeven
2007-07-16 12:16 ` Jens Axboe
2007-07-16 12:59 ` Geert Uytterhoeven
2007-07-16 13:04 ` Jens Axboe
2007-07-16 13:24 ` Geert Uytterhoeven
2007-07-16 13:33 ` Jens Axboe
2007-07-16 21:38 ` Benjamin Herrenschmidt
2007-07-16 13:47 ` James Bottomley
2007-07-16 14:38 ` Jens Axboe
2007-07-16 14:59 ` Geert Uytterhoeven
2007-07-16 21:40 ` Benjamin Herrenschmidt [this message]
2007-07-16 21:49 ` Benjamin Herrenschmidt
2007-07-16 22:03 ` James Bottomley
2007-07-16 22:12 ` Benjamin Herrenschmidt
2007-07-13 16:35 ` Jens Axboe
2007-07-13 23:12 ` Benjamin Herrenschmidt
2007-07-16 12:08 ` Segher Boessenkool
2007-07-13 14:51 ` Jens Axboe
2007-07-13 23:06 ` Benjamin Herrenschmidt
2007-07-04 13:22 ` [patch 6/6] ps3: FLASH ROM " Geert Uytterhoeven
2007-07-10 7:45 ` [patch 0/6] PS3 Storage Drivers for 2.6.23, take 4 Geert Uytterhoeven
2007-07-10 7:55 ` Jens Axboe
2007-07-10 8:01 ` Paul Mackerras
2007-07-10 8:32 ` Jens Axboe
2007-07-13 9:31 ` Geert Uytterhoeven
2007-07-13 12:27 ` PS3 Storage Driver O_DIRECT issue Olaf Hering
2007-07-13 13:34 ` Geert Uytterhoeven
2007-07-17 16:40 ` Geoff Levand
2007-07-18 16:12 ` Geert Uytterhoeven
2007-07-18 17:57 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2007-06-21 14:14 [patch 0/6] PS3 Storage Drivers for 2.6.23, take 3 Geert Uytterhoeven
2007-06-21 14:14 ` [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver Geert Uytterhoeven
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