tree fb7ef719d745e28678d73f884108f4cb2ef79171
parent d6afe27bfff30fbec2cca6ad5626c22f4094d770
author Nick Piggin <nickpiggin@yahoo.com.au> 1120784216 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1120785825 -0700

[PATCH] page_uptodate locking scalability

Use a bit spin lock in the first buffer of the page to synchronise asynch
IO buffer completions, instead of the global page_uptodate_lock, which is
showing some scalabilty problems.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>