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[SPARC64]: Avoid dcache-dirty page state management on sun4v.

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It is totally wasted work, since we have no D-cache aliasing
issues on sun4v.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-02-26 19:44:50 -08:00
parent 2a3a5f5ddb
commit 7a591cfe4e
2 changed files with 28 additions and 21 deletions
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46
arch/sparc64/mm/init.c
View File

@@ -188,8 +188,9 @@ atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
#endif #endif
#endif #endif
__inline__ void flush_dcache_page_impl(struct page *page) inline void flush_dcache_page_impl(struct page *page)
{ {
BUG_ON(tlb_type == hypervisor);
#ifdef CONFIG_DEBUG_DCFLUSH #ifdef CONFIG_DEBUG_DCFLUSH
atomic_inc(&dcpage_flushes); atomic_inc(&dcpage_flushes);
#endif #endif
@@ -279,29 +280,31 @@ unsigned long _PAGE_SZBITS __read_mostly;
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte) void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{ {
struct mm_struct *mm; struct mm_struct *mm;
struct page *page;
unsigned long pfn;
unsigned long pg_flags;
pfn = pte_pfn(pte); if (tlb_type != hypervisor) {
if (pfn_valid(pfn) && unsigned long pfn = pte_pfn(pte);
(page = pfn_to_page(pfn), page_mapping(page)) && unsigned long pg_flags;
((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) { struct page *page;
int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
PG_dcache_cpu_mask);
int this_cpu = get_cpu();
/* This is just to optimize away some function calls if (pfn_valid(pfn) &&
* in the SMP case. (page = pfn_to_page(pfn), page_mapping(page)) &&
*/ ((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
if (cpu == this_cpu) int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
flush_dcache_page_impl(page); PG_dcache_cpu_mask);
else int this_cpu = get_cpu();
smp_flush_dcache_page_impl(page, cpu);
clear_dcache_dirty_cpu(page, cpu); /* This is just to optimize away some function calls
* in the SMP case.
*/
if (cpu == this_cpu)
flush_dcache_page_impl(page);
else
smp_flush_dcache_page_impl(page, cpu);
put_cpu(); clear_dcache_dirty_cpu(page, cpu);
put_cpu();
}
} }
mm = vma->vm_mm; mm = vma->vm_mm;
@@ -321,6 +324,9 @@ void flush_dcache_page(struct page *page)
struct address_space *mapping; struct address_space *mapping;
int this_cpu; int this_cpu;
if (tlb_type == hypervisor)
return;
/* Do not bother with the expensive D-cache flush if it /* Do not bother with the expensive D-cache flush if it
* is merely the zero page. The 'bigcore' testcase in GDB * is merely the zero page. The 'bigcore' testcase in GDB
* causes this case to run millions of times. * causes this case to run millions of times.

3
arch/sparc64/mm/tlb.c
View File

@@ -49,7 +49,8 @@ void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t
if (pte_exec(orig)) if (pte_exec(orig))
vaddr |= 0x1UL; vaddr |= 0x1UL;
if (pte_dirty(orig)) { if (tlb_type != hypervisor &&
pte_dirty(orig)) {
unsigned long paddr, pfn = pte_pfn(orig); unsigned long paddr, pfn = pte_pfn(orig);
struct address_space *mapping; struct address_space *mapping;
struct page *page; struct page *page;