From: Jens Axboe <axboe@suse.de>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [BIO] Bounce queue in bio_add_page
Date: Tue, 4 Nov 2003 10:03:53 +0100 [thread overview]
Message-ID: <20031104090353.GM1477@suse.de> (raw)
In-Reply-To: <20031104090325.GA21301@gondor.apana.org.au>
On Tue, Nov 04 2003, Herbert Xu wrote:
> On Tue, Nov 04, 2003 at 09:49:30AM +0100, Jens Axboe wrote:
> >
> > That could work, but it breaks the rule that counts are always accurate.
>
> Yes, it means that recount may return a higher value but it is never
> lower.
Precisely. Historically, that would have caused panics in some drivers
even though it is safe :)
> I think it should be safe though as recount is not always called (it is
> only called if the phys/hw segments exceed the limits). In the cases
> where it is not called you may be looking at an overestimate anyway.
I think it is safe too, just want to make absolutely sure.
--
Jens Axboe
next prev parent reply other threads:[~2003-11-04 9:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-01 4:46 [BIO] Bounce queue in bio_add_page Herbert Xu
2003-11-01 10:05 ` Herbert Xu
2003-11-03 12:25 ` Jens Axboe
2003-11-03 20:52 ` Herbert Xu
2003-11-04 8:49 ` Jens Axboe
2003-11-04 9:03 ` Herbert Xu
2003-11-04 9:03 ` Jens Axboe [this message]
2003-11-05 9:48 ` Jens Axboe
2003-11-06 21:09 ` Herbert Xu
2003-11-07 11:23 ` Herbert Xu
2003-11-07 11:25 ` Jens Axboe
2003-11-07 11:28 ` Herbert Xu
2003-11-07 11:32 ` Jens Axboe
2003-11-07 22:52 ` Herbert Xu
2003-11-08 9:29 ` Jens Axboe
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