diff options
| author | Nick Piggin <nickpiggin@yahoo.com.au> | 2005-07-07 17:56:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-07 18:23:45 -0700 |
| commit | a39722034ae37f80a1803bf781fe3fe1b03e20bc (patch) | |
| tree | fb7ef719d745e28678d73f884108f4cb2ef79171 /include/linux | |
| parent | d6afe27bfff30fbec2cca6ad5626c22f4094d770 (diff) | |
| download | lwn-a39722034ae37f80a1803bf781fe3fe1b03e20bc.tar.gz lwn-a39722034ae37f80a1803bf781fe3fe1b03e20bc.zip | |
[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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/buffer_head.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 802c91e9b3da..90828493791f 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -19,6 +19,9 @@ enum bh_state_bits { BH_Dirty, /* Is dirty */ BH_Lock, /* Is locked */ BH_Req, /* Has been submitted for I/O */ + BH_Uptodate_Lock,/* Used by the first bh in a page, to serialise + * IO completion of other buffers in the page + */ BH_Mapped, /* Has a disk mapping */ BH_New, /* Disk mapping was newly created by get_block */ |