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authorNick Piggin <nickpiggin@yahoo.com.au>2005-07-07 17:56:56 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-07 18:23:45 -0700
commita39722034ae37f80a1803bf781fe3fe1b03e20bc (patch)
treefb7ef719d745e28678d73f884108f4cb2ef79171 /include/linux/buffer_head.h
parentd6afe27bfff30fbec2cca6ad5626c22f4094d770 (diff)
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op-kernel-dev-a39722034ae37f80a1803bf781fe3fe1b03e20bc.tar.gz
[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/buffer_head.h')
-rw-r--r--include/linux/buffer_head.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 802c91e..9082849 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 */
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