tree 1ef99fd4d7246b2afa16dc7d1514b6ff25fa8284
parent b0d62e6d5b3318b6b722121d945afa295f7201b5
author Chen, Kenneth W <kenneth.w.chen@intel.com> 1126296122 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1126299451 -0700

[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>