readahead: introduce PG_readahead

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Introduce a new page flag: PG_readahead.

It acts as a look-ahead mark, which tells the page reader: Hey, it's time to
invoke the read-ahead logic.  For the sake of I/O pipelining, don't wait until
it runs out of cached pages!

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Steven Pratt <slpratt@austin.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Fengguang Wu 2007-07-19 01:47:55 -07:00 • committed by Linus Torvalds

parent 2ba2d00363

commit d77c2d7cc5

2 changed files with 6 additions and 1 deletions

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5

include/linux/page-flags.h

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2

mm/page_alloc.c

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