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| author | Chen, Kenneth W <kenneth.w.chen@intel.com> | 2005-09-09 13:02:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 13:57:31 -0700 |
| commit | 383f2835eb9afb723af71850037b2f074ac9db60 (patch) | |
| tree | 1ef99fd4d7246b2afa16dc7d1514b6ff25fa8284 /include/asm-ia64 | |
| parent | b0d62e6d5b3318b6b722121d945afa295f7201b5 (diff) | |
| download | kernel_samsung_smdk4412-383f2835eb9afb723af71850037b2f074ac9db60.tar.gz kernel_samsung_smdk4412-383f2835eb9afb723af71850037b2f074ac9db60.tar.bz2 kernel_samsung_smdk4412-383f2835eb9afb723af71850037b2f074ac9db60.zip | |
[PATCH] Prefetch kernel stacks to speed up context switch
For architecture like ia64, the switch stack structure is fairly large
(currently 528 bytes). For context switch intensive application, we found
that significant amount of cache misses occurs in switch_to() function.
The following patch adds a hook in the schedule() function to prefetch
switch stack structure as soon as 'next' task is determined. This allows
maximum overlap in prefetch cache lines for that structure.
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-ia64')
| -rw-r--r-- | include/asm-ia64/system.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-ia64/system.h b/include/asm-ia64/system.h index 33256db4a7c..635235fa1e3 100644 --- a/include/asm-ia64/system.h +++ b/include/asm-ia64/system.h @@ -275,6 +275,7 @@ extern void ia64_load_extra (struct task_struct *task); */ #define __ARCH_WANT_UNLOCKED_CTXSW +#define ARCH_HAS_PREFETCH_SWITCH_STACK #define ia64_platform_is(x) (strcmp(x, platform_name) == 0) void cpu_idle_wait(void); |