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| author | Nikita Danilov <nikita@clusterfs.com> | 2006-01-06 00:11:08 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:33:26 -0800 |
| commit | bbfbb7cec9dd7266534b2b4b9c8be2fa425bbfc9 (patch) | |
| tree | d1949123224d1674a7192743d188ff652c964663 /mm | |
| parent | a226f6c899799fe2c4919daa0767ac579c88f7bd (diff) | |
| download | linux-bbfbb7cec9dd7266534b2b4b9c8be2fa425bbfc9.tar.gz linux-bbfbb7cec9dd7266534b2b4b9c8be2fa425bbfc9.tar.bz2 linux-bbfbb7cec9dd7266534b2b4b9c8be2fa425bbfc9.zip | |
[PATCH] find_lock_page(): call __lock_page() directly.
As find_lock_page() already checks with TestSetPageLocked() that page is
locked, there is no need to call lock_page() that will try-lock page again
(chances of page being unlocked in between are small). Call __lock_page()
directly, this saves one atomic operation.
Also, mark truncate-while-slept path as unlikely while we are here.
(akpm: ug. But this is actually a common path for normal old read()s against
a page which is under readahead I/O so ho-hum.)
Signed-off-by: Nikita Danilov <danilov@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/filemap.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 6e1d08a2b8b9..4ef24a397684 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -555,11 +555,12 @@ repeat: page_cache_get(page); if (TestSetPageLocked(page)) { read_unlock_irq(&mapping->tree_lock); - lock_page(page); + __lock_page(page); read_lock_irq(&mapping->tree_lock); /* Has the page been truncated while we slept? */ - if (page->mapping != mapping || page->index != offset) { + if (unlikely(page->mapping != mapping || + page->index != offset)) { unlock_page(page); page_cache_release(page); goto repeat; |