[patch] x86, small syscall entry speedup, 2.1.90

MOLNAR Ingo (mingo@chiara.csoma.elte.hu)
Fri, 13 Mar 1998 18:33:55 +0100 (CET)

this patch speeds up syscall entry and page faults by 1 cycle on a pentium
;) It's tested.

-- mingo

--- linux/arch/i386/kernel/entry.S.orig Thu Mar 19 06:39:59 1998
+++ linux/arch/i386/kernel/entry.S Thu Mar 19 06:40:35 1998
@@ -91,8 +91,8 @@
pushl %ecx; \
pushl %ebx; \
movl $(__KERNEL_DS),%edx; \
- mov %dx,%ds; \
- mov %dx,%es;
+ movb %dx,%ds; \
+ movb %dx,%es;

#define RESTORE_ALL \
popl %ebx; \
@@ -250,8 +250,8 @@
pushl %eax # push the error code
pushl %edx
movl $(__KERNEL_DS),%edx
- mov %dx,%ds
- mov %dx,%es
+ movb %dx,%ds
+ movb %dx,%es
GET_CURRENT(%ebx)
call *%ecx
addl $8,%esp

-
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