[PATCH] clean up the TLB takedown code, remove debug

- Remove the temp /proc/meminfo stats

- Make the mmu_gather_t be 2048 bytes again

- Removed unused variable (Oleg Nesterov)

fs/proc/proc_misc.c

@@ -136,16 +136,8 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
 	struct sysinfo i;
 	int len, committed;
 	struct page_state ps;
-	int cpu;
 	unsigned long inactive;
 	unsigned long active;
-	unsigned long flushes = 0;
-	unsigned long non_flushes = 0;
-
-	for (cpu = 0; cpu < NR_CPUS; cpu++) {
-		flushes += mmu_gathers[cpu].flushes;
-		non_flushes += mmu_gathers[cpu].avoided_flushes;
-	}
 
 	get_page_state(&ps);
 	get_zone_counts(&active, &inactive);
@@ -181,9 +173,7 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
 		"Mapped:       %8lu kB\n"
 		"Committed_AS: %8u kB\n"
 		"PageTables:   %8lu kB\n"
-		"ReverseMaps:  %8lu\n"
-		"TLB flushes:  %8lu\n"
-		"non flushes:  %8lu\n",
+		"ReverseMaps:  %8lu\n",
 		K(i.totalram),
 		K(i.freeram),
 		K(i.sharedram),
@@ -203,9 +193,7 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
 		K(ps.nr_mapped),
 		K(committed),
 		K(ps.nr_page_table_pages),
-		ps.nr_reverse_maps,
-		flushes,
-		non_flushes
+		ps.nr_reverse_maps
 		);
 
 #ifdef CONFIG_HUGETLB_PAGE

include/asm-generic/tlb.h

@@ -21,7 +21,7 @@
  * and page free order so much..
  */
 #ifdef CONFIG_SMP
-  #define FREE_PTE_NR	507
+  #define FREE_PTE_NR	506
   #define tlb_fast_mode(tlb) ((tlb)->nr == ~0U)
 #else
   #define FREE_PTE_NR	1
@@ -40,8 +40,6 @@ typedef struct free_pte_ctx {
 	unsigned int		fullmm; /* non-zero means full mm flush */
 	unsigned long		freed;
 	struct page *		pages[FREE_PTE_NR];
-	unsigned long		flushes;/* stats: count avoided flushes */
-	unsigned long		avoided_flushes;
 } mmu_gather_t;
 
 /* Users of the generic TLB shootdown code must declare this storage space. */
@@ -67,17 +65,10 @@ static inline mmu_gather_t *tlb_gather_mmu(struct mm_struct *mm, unsigned int fu
 
 static inline void tlb_flush_mmu(mmu_gather_t *tlb, unsigned long start, unsigned long end)
 {
-	unsigned long nr;
-
-	if (!tlb->need_flush) {
-		tlb->avoided_flushes++;
+	if (!tlb->need_flush)
 		return;
-	}
 	tlb->need_flush = 0;
-	tlb->flushes++;
-
 	tlb_flush(tlb);
-	nr = tlb->nr;
 	if (!tlb_fast_mode(tlb)) {
 		free_pages_and_swap_cache(tlb->pages, tlb->nr);
 		tlb->nr = 0;