From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: Steven Pratt <slpratt@austin.ibm.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH/RFC] Simplified Readahead
Date: Sat, 25 Sep 2004 10:45:03 +1000 [thread overview]
Message-ID: <4154BF8F.9070904@yahoo.com.au> (raw)
In-Reply-To: <20040924150523.4853465b.akpm@osdl.org>
Andrew Morton wrote:
> Steven Pratt <slpratt@austin.ibm.com> wrote:
>>Can you expand on the POSIX_FADV_WILLNEED.
>
>
> It's an application-specified readahead hint. It should ideally be
> asynchronous so the application can get some I/O underway while it's
> crunching on something else. If the queue is contested then the
> application will accidentally block when launching the readahead, which
> kinda defeats the purpose.
>
> Yes, the application will block when it does the subsequent read() anyway,
> but applications expect to block in read(). Seems saner this way.
Good point. I guess you're right.
next prev parent reply other threads:[~2004-09-25 0:45 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-23 16:06 [PATCH/RFC] Simplified Readahead Steven Pratt
2004-09-23 22:14 ` Joel Schopp
2004-09-24 0:21 ` Nick Piggin
2004-09-24 2:42 ` Andrew Morton
2004-09-24 15:40 ` Steven Pratt
2004-09-24 16:16 ` Nick Piggin
2004-09-24 16:48 ` Steven Pratt
2004-09-24 22:05 ` Andrew Morton
2004-09-24 22:43 ` Steven Pratt
2004-09-24 23:01 ` Andrew Morton
2004-09-27 15:39 ` Steven Pratt
2004-09-27 19:26 ` Andrew Morton
2004-09-28 10:13 ` Jens Axboe
2004-09-24 22:55 ` Steven Pratt
2004-09-27 20:29 ` Ray Bryant
2004-09-27 21:04 ` Steven Pratt
2004-09-25 0:45 ` Nick Piggin [this message]
2004-09-25 1:01 ` Ram Pai
2004-09-25 6:07 ` Ram Pai
2004-09-27 15:30 ` Steven Pratt
2004-09-27 18:42 ` Ram Pai
2004-09-27 20:07 ` Steven Pratt
2004-09-29 18:46 ` Ram Pai
2004-09-29 22:33 ` Steven Pratt
2004-09-29 23:13 ` Andreas Dilger
2004-09-30 2:26 ` Ram Pai
2004-09-30 5:29 ` Andrew Morton
2004-09-30 20:20 ` Stephen C. Tweedie
2004-09-30 1:12 ` Ram Pai
2004-10-01 21:02 ` Steven Pratt
2004-10-05 17:52 ` Ram Pai
[not found] <372479081@toto.iv>
2004-09-24 5:00 ` Peter Chubb
2004-09-24 22:57 ` Steven Pratt
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