From b3cf257623fabd8f1ee6700a6d328cc1c5da5a1d Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Sun, 9 Jul 2006 21:12:39 -0400 Subject: [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 Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Acked-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-i386/thread_info.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/asm-i386/thread_info.h') diff --git a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h index 2833fa2c0dd..54d6d7aea93 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) #define TIF_SECCOMP 8 /* secure computing */ #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ #define TIF_MEMDIE 16 +#define TIF_DEBUG 17 /* uses debug registers */ +#define TIF_IO_BITMAP 18 /* uses I/O bitmap */ #define _TIF_SYSCALL_TRACE (1<