Messages in this thread Patch in this message | | | Date | Tue, 13 Jun 2006 21:54:46 +0200 | From | Andreas Mohr <> | Subject | [PATCH -mm] i386 syscall opcode reordering (pipelining) |
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Hi all,
I'd guess that this version features improved pipeline parallelism, since we isolate competing %ebx accesses (_syscall4()) and stack push operations (_syscall5()), right?
Signed-off-by: Andreas Mohr <andi@lisas.de>
diff -urN linux-2.6.17-rc6-mm2.orig/include/asm-i386/unistd.h linux-2.6.17-rc6-mm2.my/include/asm-i386/unistd.h --- linux-2.6.17-rc6-mm2.orig/include/asm-i386/unistd.h 2006-06-13 19:28:15.000000000 +0200 +++ linux-2.6.17-rc6-mm2.my/include/asm-i386/unistd.h 2006-06-13 19:40:07.000000000 +0200 @@ -400,7 +400,7 @@ type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5) \ { \ long __res; \ -__asm__ volatile ("push %%ebx ; movl %2,%%ebx ; movl %1,%%eax ; " \ +__asm__ volatile ("push %%ebx ; movl %1,%%eax ; movl %2,%%ebx ; " \ "int $0x80 ; pop %%ebx" \ : "=a" (__res) \ : "i" (__NR_##name),"ri" ((long)(arg1)),"c" ((long)(arg2)), \ @@ -415,8 +415,8 @@ { \ long __res; \ struct { long __a1; long __a6; } __s = { (long)arg1, (long)arg6 }; \ -__asm__ volatile ("push %%ebp ; push %%ebx ; movl 4(%2),%%ebp ; " \ - "movl 0(%2),%%ebx ; movl %1,%%eax ; int $0x80 ; " \ +__asm__ volatile ("push %%ebp ; movl %1,%%eax ; push %%ebx ; " \ + "movl 4(%2),%%ebp ; movl 0(%2),%%ebx ; int $0x80 ; " \ "pop %%ebx ; pop %%ebp" \ : "=a" (__res) \ : "i" (__NR_##name),"0" ((long)(&__s)),"c" ((long)(arg2)), \ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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