diff options
| author | Andrew Morton <akpm@osdl.org> | 2004-06-23 18:48:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-06-23 18:48:56 -0700 |
| commit | 36f9f2094996483001457fb02398d4b7eae170bd (patch) | |
| tree | 0e39898a3e14a0e5425c4b8ae692da7b1209e653 /include/linux | |
| parent | 5e1c40de84c8e0514e8fe7e5db5087355dc00d5c (diff) | |
[PATCH] Allow i386 to reenable interrupts on lock contention
From: Zwane Mwaikambo <zwane@linuxpower.ca>
Following up on Keith's code, I adapted the i386 code to allow enabling
interrupts during contested locks depending on previous interrupt
enable status. Obviously there will be a text increase (only for non
CONFIG_SPINLINE case), although it doesn't seem so bad, there will be an
increased exit latency when we attempt a lock acquisition after spinning
due to the extra instructions. How much this will affect performance I'm
not sure yet as I haven't had time to micro bench.
text data bss dec hex filename
2628024 921731 0 3549755 362a3b vmlinux-after
2621369 921731 0 3543100 36103c vmlinux-before
2618313 919222 0 3537535 35fa7f vmlinux-spinline
The code has been stress tested on a 16x NUMAQ (courtesy OSDL).
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions