on-demand readahead

Andrew,

This is the standalone on-demand readahead patchset that applies to
linux-2.6.22-rc1-mm1. It _replaces_ the current readahead algorithm with
the on-demand readahead algorithm that was first introduced in mail
http://lkml.org/lkml/2007/4/25/182.

patchset:

[PATCH 1/9] readahead: introduce PG_readahead
[PATCH 2/9] readahead: add look-ahead support to __do_page_cache_readahead()
[PATCH 3/9] readahead: MIN_RA_PAGES/MAX_RA_PAGES macros
[PATCH 4/9] readahead: data structure and routines
[PATCH 5/9] readahead: on-demand readahead logic
[PATCH 6/9] readahead: convert filemap invocations
[PATCH 7/9] readahead: convert splice invocations
[PATCH 8/9] readahead: convert ext3/ext4 invocations
[PATCH 9/9] readahead: remove the old algorithm

diffstat:

 fs/ext3/dir.c              |   14
 fs/ext4/dir.c              |   14
 fs/splice.c                |   18 -
 include/linux/fs.h         |   73 ++++-
 include/linux/mm.h         |    5
 include/linux/page-flags.h |    5
 mm/filemap.c               |   51 ++-
 mm/page_alloc.c            |    2
 mm/readahead.c             |  511 +++++++++++++----------------------
 9 files changed, 322 insertions(+), 371 deletions(-)

Regards,
Fengguang Wu
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