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Message-Id: <20090407115234.770399130@intel.com>
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Date: Tue, 07 Apr 2009 19:50:48 +0800
From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Wu Fengguang <fengguang.wu@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Mike Waychison <mikew@google.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rohit Seth <rohitseth@google.com>
Cc: Edwin <edwintorok@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ying Han <yinghan@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Cc: <linux-mm@kvack.org>
Cc: <linux-fsdevel@vger.kernel.org>
Subject: [PATCH 09/14] readahead: increase interleaved readahead size
Content-Disposition: inline; filename=readahead-interleaved-size.patch
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
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Make sure interleaved readahead size is larger than request size.
This also makes readahead window grow up more quickly.

Reported-by: Xu Chenfeng <xcf@ustc.edu.cn>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
 mm/readahead.c |    1 +
 1 file changed, 1 insertion(+)

--- mm.orig/mm/readahead.c
+++ mm/mm/readahead.c
@@ -428,6 +428,7 @@ ondemand_readahead(struct address_space 
 
 		ra->start = start;
 		ra->size = start - offset;	/* old async_size */
+		ra->size += req_size;
 		ra->size = get_next_ra_size(ra, max);
 		ra->async_size = ra->size;
 		goto readit;

--