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[PATCH] i386: Use CLFLUSH instead of WBINVD in change_page_attr

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CLFLUSH is a lot faster than WBINVD so try to use that.

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-12-07 02:14:05 +01:00 committed by Andi Kleen
parent 770d132f03
commit 3760dd6efa
2 changed files with 18 additions and 7 deletions
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24
arch/i386/mm/pageattr.c
View file

@ -67,11 +67,17 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
return base;
}
static void flush_kernel_map(void *dummy)
static void flush_kernel_map(void *arg)
{
/* Could use CLFLUSH here if the CPU supports it (Hammer,P4) */
if (boot_cpu_data.x86_model >= 4)
unsigned long adr = (unsigned long)arg;
if (adr && cpu_has_clflush) {
int i;
for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
asm volatile("clflush (%0)" :: "r" (adr + i));
} else if (boot_cpu_data.x86_model >= 4)
wbinvd();
/* Flush all to work around Errata in early athlons regarding
* large page flushing.
*/
@ -173,9 +179,9 @@ __change_page_attr(struct page *page, pgprot_t prot)
return 0;
}
static inline void flush_map(void)
static inline void flush_map(void *adr)
{
on_each_cpu(flush_kernel_map, NULL, 1, 1);
on_each_cpu(flush_kernel_map, adr, 1, 1);
}
/*
@ -217,9 +223,13 @@ void global_flush_tlb(void)
spin_lock_irq(&cpa_lock);
list_replace_init(&df_list, &l);
spin_unlock_irq(&cpa_lock);
flush_map();
list_for_each_entry_safe(pg, next, &l, lru)
if (!cpu_has_clflush)
flush_map(0);
list_for_each_entry_safe(pg, next, &l, lru) {
if (cpu_has_clflush)
flush_map(page_address(pg));
__free_page(pg);
}
}
#ifdef CONFIG_DEBUG_PAGEALLOC

1
include/asm-i386/cpufeature.h
View file

@ -137,6 +137,7 @@
#define cpu_has_pmm_enabled boot_cpu_has(X86_FEATURE_PMM_EN)
#define cpu_has_ds boot_cpu_has(X86_FEATURE_DS)
#define cpu_has_pebs boot_cpu_has(X86_FEATURE_PEBS)
#define cpu_has_clflush boot_cpu_has(X86_FEATURE_CLFLSH)
#endif /* __ASM_I386_CPUFEATURE_H */