From: Wu Fengguang <wfg@mail.ustc.edu.cn>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, Wu Fengguang <wfg@mail.ustc.edu.cn>
Subject: [PATCH 1/5] readahead: no RA_FLAG_EOF on single page file
Date: Fri, 09 Jun 2006 16:08:02 +0800 [thread overview]
Message-ID: <349840678.85381@ustc.edu.cn> (raw)
Message-ID: <20060609081119.231751179@localhost.localdomain> (raw)
In-Reply-To: 20060609080801.741901069@localhost.localdomain
[-- Attachment #1: readahead-reduce-close-call.patch --]
[-- Type: text/plain, Size: 802 bytes --]
Dot not set RA_FLAG_EOF on single page files.
readahead_close() will be called if RA_FLAG_EOF is there on file close.
It detects readahead hit/miss, and adjust ra_expected_bytes correspondingly.
Single page files are uninteresting for it. Since near 40% desktop
files are <= 4k, this patch can reduce many useless readahead_close()
invocations.
Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
---
--- linux-2.6.17-rc5-mm3.orig/mm/readahead.c
+++ linux-2.6.17-rc5-mm3/mm/readahead.c
@@ -1037,7 +1037,8 @@ static int ra_dispatch(struct file_ra_st
ra->readahead_index = eof_index;
if (ra->lookahead_index > eof_index)
ra->lookahead_index = eof_index;
- ra->flags |= RA_FLAG_EOF;
+ if (eof_index > 1)
+ ra->flags |= RA_FLAG_EOF;
}
/* Disable look-ahead for loopback file. */
--
next prev parent reply other threads:[~2006-06-09 8:11 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060609080801.741901069@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 0/5] Adaptive readahead updates 2 Wu Fengguang
[not found] ` <20060609081119.231751179@localhost.localdomain>
2006-06-09 8:08 ` Wu Fengguang [this message]
[not found] ` <20060609081120.054527393@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 3/5] readahead: call scheme - no fastcall for readahead_cache_hit() Wu Fengguang
[not found] ` <20060609081120.531013274@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 4/5] readahead: backoff on I/O error Wu Fengguang
2006-06-10 18:33 ` Ingo Oeser
2006-06-10 19:48 ` Michael Tokarev
[not found] ` <20060612011245.GA5214@mail.ustc.edu.cn>
2006-06-12 1:12 ` Wu Fengguang
2006-06-12 3:43 ` Andrew Morton
2006-06-12 11:06 ` Michael Tokarev
2006-06-17 6:38 ` Michael Tokarev
2006-06-17 7:00 ` Michael Tokarev
[not found] ` <20060609081121.002572642@localhost.localdomain>
2006-06-09 8:08 ` [PATCH 5/5] readahead: remove size limit on read_ahead_kb Wu Fengguang
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