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readahead: increase interleaved readahead size

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Make sure interleaved readahead size is larger than request size.  This
also makes the readahead window grow up more quickly.

Reported-by: Xu Chenfeng <xcf@ustc.edu.cn>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wu Fengguang 2009-06-16 15:31:23 -07:00 committed by Linus Torvalds
parent caca7cb748
commit 160334a0cf
1 changed files with 1 additions and 0 deletions
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mm/readahead.c
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@ -403,6 +403,7 @@ ondemand_readahead(struct address_space *mapping,
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;