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| author | Stephane Eranian <eranian@hpl.hp.com> | 2006-07-09 21:12:39 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-09 18:47:12 -0700 |
| commit | b3cf257623fabd8f1ee6700a6d328cc1c5da5a1d (patch) | |
| tree | 28b98f21dd108864d2edc11d179cb48c118b2cf8 /fs/splice.c | |
| parent | 09075ef0fd585fb093bb9a6cd1240272114f89cf (diff) | |
| download | lwn-b3cf257623fabd8f1ee6700a6d328cc1c5da5a1d.tar.gz lwn-b3cf257623fabd8f1ee6700a6d328cc1c5da5a1d.zip | |
[PATCH] i386: use thread_info flags for debug regs and IO bitmaps
Use thread info flags to track use of debug registers and IO bitmaps.
- add TIF_DEBUG to track when debug registers are active
- add TIF_IO_BITMAP to track when I/O bitmap is used
- modify __switch_to() to use the new TIF flags
Performance tested on Pentium II, ten runs of LMbench context switch
benchmark (smaller is better:)
before after
avg 3.65 3.39
min 3.55 3.33
Signed-off-by: Stephane Eranian <eranian@hpl.hp.com>
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/splice.c')
0 files changed, 0 insertions, 0 deletions