aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-i386
diff options
context:
space:
mode:
authorStephane Eranian <eranian@hpl.hp.com>2006-07-09 21:12:39 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-09 21:47:12 -0400
commitb3cf257623fabd8f1ee6700a6d328cc1c5da5a1d (patch)
tree28b98f21dd108864d2edc11d179cb48c118b2cf8 /include/asm-i386
parent09075ef0fd585fb093bb9a6cd1240272114f89cf (diff)
[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 'include/asm-i386')
-rw-r--r--include/asm-i386/thread_info.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h
index 2833fa2c0dd0..54d6d7aea938 100644
--- a/include/asm-i386/thread_info.h
+++ b/include/asm-i386/thread_info.h
@@ -140,6 +140,8 @@ static inline struct thread_info *current_thread_info(void)
140#define TIF_SECCOMP 8 /* secure computing */ 140#define TIF_SECCOMP 8 /* secure computing */
141#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 141#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
142#define TIF_MEMDIE 16 142#define TIF_MEMDIE 16
143#define TIF_DEBUG 17 /* uses debug registers */
144#define TIF_IO_BITMAP 18 /* uses I/O bitmap */
143 145
144#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 146#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
145#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 147#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
@@ -151,6 +153,8 @@ static inline struct thread_info *current_thread_info(void)
151#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 153#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
152#define _TIF_SECCOMP (1<<TIF_SECCOMP) 154#define _TIF_SECCOMP (1<<TIF_SECCOMP)
153#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 155#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
156#define _TIF_DEBUG (1<<TIF_DEBUG)
157#define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
154 158
155/* work to do on interrupt/exception return */ 159/* work to do on interrupt/exception return */
156#define _TIF_WORK_MASK \ 160#define _TIF_WORK_MASK \
@@ -159,6 +163,9 @@ static inline struct thread_info *current_thread_info(void)
159/* work to do on any return to u-space */ 163/* work to do on any return to u-space */
160#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) 164#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
161 165
166/* flags to check in __switch_to() */
167#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP)
168
162/* 169/*
163 * Thread-synchronous status. 170 * Thread-synchronous status.
164 * 171 *