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

Browse source 
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
__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
atomic_inc(&dcpage_flushes);
#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)
{
struct mm_struct *mm;
struct page *page;
unsigned long pfn;
unsigned long pg_flags;
pfn = pte_pfn(pte);
if (pfn_valid(pfn) &&
(page = pfn_to_page(pfn), page_mapping(page)) &&
((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
PG_dcache_cpu_mask);
int this_cpu = get_cpu();
if (tlb_type != hypervisor) {
unsigned long pfn = pte_pfn(pte);
unsigned long pg_flags;
struct page *page;
/* 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);
if (pfn_valid(pfn) &&
(page = pfn_to_page(pfn), page_mapping(page)) &&
((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
PG_dcache_cpu_mask);
int this_cpu = get_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;
@ -321,6 +324,9 @@ void flush_dcache_page(struct page *page)
struct address_space *mapping;
int this_cpu;
if (tlb_type == hypervisor)
return;
/* Do not bother with the expensive D-cache flush if it
* is merely the zero page. The 'bigcore' testcase in GDB
* 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))
vaddr |= 0x1UL;
if (pte_dirty(orig)) {
if (tlb_type != hypervisor &&
pte_dirty(orig)) {
unsigned long paddr, pfn = pte_pfn(orig);
struct address_space *mapping;
struct page *page;