From 53ee11ae0d73f28029a5f0d991bc4dcd7c817e7a Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 26 Sep 2006 10:52:38 +0200 Subject: [PATCH] [PATCH] Optimize PDA accesses slightly Based on a idea by Jeremy Fitzhardinge: Replace the volatiles and memory clobbers in the PDA access with telling gcc about access to a proxy PDA structure that doesn't actually exist. But the dummy accesses give a defined ordering for read/write accesses. Also add some memory barriers to the early GS initialization to make sure no PDA access is moved before it. Advantage is some .text savings (probably most from better code for accessing "current"): text data bss dec hex filename 4845647 1223688 615864 6685199 66020f vmlinux 4837780 1223688 615864 6677332 65e354 vmlinux-pda 1.2% smaller code Cc: Jeremy Fitzhardinge Signed-off-by: Andi Kleen --- arch/x86_64/kernel/setup64.c | 3 +++ include/asm-x86_64/pda.h | 41 ++++++++++++++++++++++------------------- 2 files changed, 25 insertions(+), 19 deletions(-) diff --git a/arch/x86_64/kernel/setup64.c b/arch/x86_64/kernel/setup64.c index e85cfbb..4913617 100644 --- a/arch/x86_64/kernel/setup64.c +++ b/arch/x86_64/kernel/setup64.c @@ -121,7 +121,10 @@ void pda_init(int cpu) /* Setup up data that may be needed in __get_free_pages early */ asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0)); + /* Memory clobbers used to order PDA accessed */ + mb(); wrmsrl(MSR_GS_BASE, pda); + mb(); pda->cpunumber = cpu; pda->irqcount = -1; diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h index b47c3df..55e21da 100644 --- a/include/asm-x86_64/pda.h +++ b/include/asm-x86_64/pda.h @@ -36,40 +36,43 @@ extern struct x8664_pda boot_cpu_pda[]; * There is no fast way to get the base address of the PDA, all the accesses * have to mention %fs/%gs. So it needs to be done this Torvaldian way. */ -#define sizeof_field(type,field) (sizeof(((type *)0)->field)) -#define typeof_field(type,field) typeof(((type *)0)->field) - extern void __bad_pda_field(void); +/* proxy_pda doesn't actually exist, but tell gcc it is accessed + for all PDA accesses so it gets read/write dependencies right. */ +extern struct x8664_pda _proxy_pda; + #define pda_offset(field) offsetof(struct x8664_pda, field) #define pda_to_op(op,field,val) do { \ - typedef typeof_field(struct x8664_pda, field) T__; \ - switch (sizeof_field(struct x8664_pda, field)) { \ + typedef typeof(_proxy_pda.field) T__; \ + switch (sizeof(_proxy_pda.field)) { \ case 2: \ -asm volatile(op "w %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ +asm(op "w %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \ + "ri" ((T__)val),"i"(pda_offset(field))); break; \ case 4: \ -asm volatile(op "l %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ +asm(op "l %1,%%gs:%P2" : "+m" (_proxy_pda.field) : \ + "ri" ((T__)val),"i"(pda_offset(field))); break; \ case 8: \ -asm volatile(op "q %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \ - default: __bad_pda_field(); \ +asm(op "q %1,%%gs:%P2": "+m" (_proxy_pda.field) : \ + "ri" ((T__)val),"i"(pda_offset(field))); break; \ +default: __bad_pda_field(); \ } \ } while (0) -/* - * AK: PDA read accesses should be neither volatile nor have an memory clobber. - * Unfortunately removing them causes all hell to break lose currently. - */ #define pda_from_op(op,field) ({ \ - typeof_field(struct x8664_pda, field) ret__; \ - switch (sizeof_field(struct x8664_pda, field)) { \ + typeof(_proxy_pda.field) ret__; \ + switch (sizeof(_proxy_pda.field)) { \ case 2: \ -asm volatile(op "w %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\ +asm(op "w %%gs:%P1,%0":"=r" (ret__):\ + "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\ case 4: \ -asm volatile(op "l %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\ +asm(op "l %%gs:%P1,%0":"=r" (ret__):\ + "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\ case 8: \ -asm volatile(op "q %%gs:%P1,%0":"=r" (ret__):"i"(pda_offset(field)):"memory"); break;\ - default: __bad_pda_field(); \ +asm(op "q %%gs:%P1,%0":"=r" (ret__):\ + "i" (pda_offset(field)), "m" (_proxy_pda.field)); break;\ +default: __bad_pda_field(); \ } \ ret__; }) -- 1.8.2.3