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[PATCH] page_uptodate locking scalability

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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>
This commit is contained in:
Nick Piggin 2005-07-07 17:56:56 -07:00 • committed by Linus Torvalds
parent d6afe27bff
commit a39722034a
2 changed files with 20 additions and 8 deletions
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3
include/linux/buffer_head.h
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@ -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 */