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readahead: record mmap read-around states in file_ra_state

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Mmap read-around now shares the same code style and data structure with
readahead code.

This also removes do_page_cache_readahead().  Its last user, mmap
read-around, has been changed to call ra_submit().

The no-readahead-if-congested logic is dumped by the way.  Users will be
pretty sensitive about the slow loading of executables.  So it's
unfavorable to disabled mmap read-around on a congested queue.

[[email protected]: coding-style fixes]
Cc: Nick Piggin <[email protected]>
Signed-off-by: Fengguang Wu <[email protected]>
Cc: Ying Han <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Wu Fengguang 2009-06-16 15:31:30 -07:00 • committed by Linus Torvalds
commit d30a11004e
3 changed files with 12 additions and 28 deletions
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12
mm/filemap.c
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@ -1488,13 +1488,15 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
if (ra->mmap_miss > MMAP_LOTSAMISS)
return;
/*
* mmap read-around
*/
ra_pages = max_sane_readahead(ra->ra_pages);
if (ra_pages) {
pgoff_t start = 0;
if (offset > ra_pages / 2)
start = offset - ra_pages / 2;
do_page_cache_readahead(mapping, file, start, ra_pages);
ra->start = max_t(long, 0, offset - ra_pages/2);
ra->size = ra_pages;
ra->async_size = 0;
ra_submit(ra, mapping, file);
}
}