[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>

2 files changed, 8 insertions, 0 deletions

diff --git a/include/asm-sparc64/mmu.h b/include/asm-sparc64/mmu.h
index 2effeba2476c..76008ff6a90b 100644
--- a/include/asm-sparc64/mmu.h
+++ b/include/asm-sparc64/mmu.h
@@ -100,6 +100,7 @@ struct tsb {
 typedef struct {
         unsigned long   sparc64_ctx_val;
         struct tsb      *tsb;
+        unsigned long   tsb_rss_limit;
         unsigned long   tsb_nentries;
         unsigned long   tsb_reg_val;
         unsigned long   tsb_map_vaddr;
diff --git a/include/asm-sparc64/mmu_context.h b/include/asm-sparc64/mmu_context.h
index 0a950f151d2b..1d232678821d 100644
--- a/include/asm-sparc64/mmu_context.h
+++ b/include/asm-sparc64/mmu_context.h
@@ -32,6 +32,13 @@ static inline void tsb_context_switch(struct mm_struct *mm)
                              mm->context.tsb_map_pte);
 }
 
+extern void tsb_grow(struct mm_struct *mm, unsigned long mm_rss, gfp_t gfp_flags);
+#ifdef CONFIG_SMP
+extern void smp_tsb_sync(struct mm_struct *mm);
+#else
+#define smp_tsb_sync(__mm) do { } while (0)
+#endif
+
 /* Set MMU context in the actual hardware. */
 #define load_secondary_context(__mm) \
         __asm__ __volatile__("stxa      %0, [%1] %2\n\t" \