[SPARC64]: Dynamically grow TSB in response to RSS growth.
As the RSS grows, grow the TSB in order to reduce the likelyhood
of hash collisions and thus poor hit rates in the TSB.
This definitely needs some serious tuning.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 7c456af..a8119cb 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -246,9 +246,11 @@
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;
+ unsigned long mm_rss;
pfn = pte_pfn(pte);
if (pfn_valid(pfn) &&
@@ -270,6 +272,11 @@
put_cpu();
}
+
+ mm = vma->vm_mm;
+ mm_rss = get_mm_rss(mm);
+ if (mm_rss >= mm->context.tsb_rss_limit)
+ tsb_grow(mm, mm_rss, GFP_ATOMIC);
}
void flush_dcache_page(struct page *page)