From: Tejun Heo <tj@kernel.org>
To: Boaz Harrosh <bharrosh@panasas.com>
Cc: axboe@kernel.dk, linux-kernel@vger.kernel.org,
fujita.tomonori@lab.ntt.co.jp
Subject: Re: [PATCH 08/17] bio: reimplement bio_copy_user_iov()
Date: Thu, 02 Apr 2009 16:51:14 +0900 [thread overview]
Message-ID: <49D46E72.7030301@kernel.org> (raw)
In-Reply-To: <49D46A8E.2090002@panasas.com>
Boaz Harrosh wrote:
> On 04/02/2009 04:38 AM, Tejun Heo wrote:
>> Hello, Boaz.
>>
>> Boaz Harrosh wrote:
>>> Please consider that this code-path is used by me, in exofs and
>>> pNFS-objcets in a very very hot path, where memory pressure is a
>>> common scenario.
>> One quick question. Don't the above paths map kernel pages to a
>> request?
>>
>
> Well vfs-page-cache pages. Any ideas?
In that case it would go through blk_rq_map_kern_sg(), so unless you
wanna change the blk_rq_map_kern_sg() interface such that it uses
bvec, the sgl overhead doesn't matter anyway. Of course, if it has
been buidling bios directly, that is a different story.
Thanks.
--
tejun
next prev parent reply other threads:[~2009-04-02 7:51 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-01 13:44 [RFC PATCHSET block] block: blk-map updates and API cleanup Tejun Heo
2009-04-01 13:44 ` [PATCH 01/17] blk-map: move blk_rq_map_user() below blk_rq_map_user_iov() Tejun Heo
2009-04-01 13:44 ` [PATCH 02/17] scatterlist: improve atomic mapping handling in mapping iterator Tejun Heo
2009-04-01 13:44 ` [PATCH 03/17] blk-map: improve alignment checking for blk_rq_map_user_iov() Tejun Heo
2009-04-01 13:44 ` [PATCH 04/17] bio: bio.h cleanup Tejun Heo
2009-04-01 13:44 ` [PATCH 05/17] bio: cleanup rw usage Tejun Heo
2009-04-02 8:36 ` Boaz Harrosh
2009-04-02 9:02 ` Tejun Heo
2009-04-02 9:07 ` Boaz Harrosh
2009-04-02 9:13 ` Tejun Heo
2009-04-01 13:44 ` [PATCH 06/17] blk-map/bio: use struct iovec instead of sg_iovec Tejun Heo
2009-04-01 14:50 ` Boaz Harrosh
2009-04-01 15:32 ` Tejun Heo
2009-04-01 13:44 ` [PATCH 07/17] blk-map/bio: rename stuff Tejun Heo
2009-04-01 13:44 ` [PATCH 08/17] bio: reimplement bio_copy_user_iov() Tejun Heo
2009-04-01 15:50 ` Boaz Harrosh
2009-04-01 23:57 ` Tejun Heo
2009-04-02 8:24 ` Boaz Harrosh
2009-04-02 8:59 ` Tejun Heo
2009-04-02 9:54 ` Boaz Harrosh
2009-04-02 1:38 ` Tejun Heo
2009-04-02 7:34 ` Boaz Harrosh
2009-04-02 7:51 ` Tejun Heo [this message]
2009-04-01 13:44 ` [PATCH 09/17] bio: collapse __bio_map_user_iov(), __bio_unmap_user() and __bio_map_kern() Tejun Heo
2009-04-01 13:44 ` [PATCH 10/17] bio: use bio_create_from_sgl() in bio_map_user_iov() Tejun Heo
2009-04-01 16:33 ` Boaz Harrosh
2009-04-01 22:20 ` Tejun Heo
2009-04-01 13:44 ` [PATCH 11/17] bio: add sgl source support to bci and implement bio_memcpy_sgl_sgl() Tejun Heo
2009-04-01 13:44 ` [PATCH 12/17] bio: implement bio_{map|copy}_kern_sgl() Tejun Heo
2009-04-01 13:44 ` [PATCH 13/17] blk-map: implement blk_rq_map_kern_sgl() Tejun Heo
2009-04-01 16:50 ` Boaz Harrosh
2009-04-01 22:25 ` Tejun Heo
2009-04-01 13:44 ` [PATCH 14/17] scsi: replace custom rq mapping with blk_rq_map_kern_sgl() Tejun Heo
2009-04-01 17:00 ` Boaz Harrosh
2009-04-01 17:05 ` James Bottomley
2009-04-01 17:17 ` Boaz Harrosh
2009-04-13 7:42 ` FUJITA Tomonori
2009-04-13 9:38 ` Tejun Heo
2009-04-13 10:07 ` FUJITA Tomonori
2009-04-13 12:59 ` Borislav Petkov
2009-04-14 0:44 ` FUJITA Tomonori
2009-04-14 10:01 ` Borislav Petkov
2009-04-14 23:44 ` FUJITA Tomonori
2009-04-15 4:25 ` Tejun Heo
2009-04-15 7:26 ` Borislav Petkov
2009-04-15 7:48 ` FUJITA Tomonori
2009-04-15 8:13 ` Borislav Petkov
2009-04-16 3:06 ` Tejun Heo
2009-04-16 3:06 ` Tejun Heo
2009-04-16 5:44 ` Borislav Petkov
2009-04-16 6:07 ` Tejun Heo
2009-04-16 6:07 ` Tejun Heo
2009-04-16 6:29 ` Borislav Petkov
2009-04-16 6:30 ` Tejun Heo
2009-04-16 6:30 ` Tejun Heo
2009-04-16 5:53 ` [PATCH 1/3] ide: add helpers for preparing sense requests Borislav Petkov
2009-04-16 5:53 ` [PATCH 2/3] ide-cd: convert to using generic sense request Borislav Petkov
2009-04-16 5:54 ` [PATCH 3/3] ide-atapi: convert ide-{floppy,tape} to using preallocated sense buffer Borislav Petkov
2009-04-01 13:44 ` [PATCH 15/17] bio/blk-map: kill unused stuff and un-export internal functions Tejun Heo
2009-04-01 13:54 ` Boaz Harrosh
2009-04-01 14:06 ` Tejun Heo
2009-04-01 13:44 ` [PATCH 16/17] blk-map/bio: remove superflous @len parameter from blk_rq_map_user_iov() Tejun Heo
2009-04-01 17:12 ` Boaz Harrosh
2009-04-01 22:17 ` Tejun Heo
2009-04-01 13:44 ` [PATCH 17/17] blk-map/bio: remove superflous @q from blk_rq_map_{user|kern}*() Tejun Heo
2009-04-01 17:05 ` Boaz Harrosh
2009-04-01 14:08 ` [RFC PATCHSET block] block: blk-map updates and API cleanup Tejun Heo
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