mm: avoid false sharing of mm_counter

Considering the nature of per mm stats, it's the shared object among
threads and can be a cache-miss point in the page fault path.

This patch adds per-thread cache for mm_counter.  RSS value will be
counted into a struct in task_struct and synchronized with mm's one at
events.

Now, in this patch, the event is the number of calls to handle_mm_fault.
Per-thread value is added to mm at each 64 calls.

 rough estimation with small benchmark on parallel thread (2threads) shows
 [before]
     4.5 cache-miss/faults
 [after]
     4.0 cache-miss/faults
 Anyway, the most contended object is mmap_sem if the number of threads grows.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 86 insertions, 8 deletions

diff --git a/mm/memory.c b/mm/memory.c
index c57678478801..a4597614f18d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -122,6 +122,79 @@ static int __init init_zero_pfn(void)
 core_initcall(init_zero_pfn);
 
 
+#if defined(SPLIT_RSS_COUNTING)
+
+void __sync_task_rss_stat(struct task_struct *task, struct mm_struct *mm)
+{
+        int i;
+
+        for (i = 0; i < NR_MM_COUNTERS; i++) {
+                if (task->rss_stat.count[i]) {
+                        add_mm_counter(mm, i, task->rss_stat.count[i]);
+                        task->rss_stat.count[i] = 0;
+                }
+        }
+        task->rss_stat.events = 0;
+}
+
+static void add_mm_counter_fast(struct mm_struct *mm, int member, int val)
+{
+        struct task_struct *task = current;
+
+        if (likely(task->mm == mm))
+                task->rss_stat.count[member] += val;
+        else
+                add_mm_counter(mm, member, val);
+}
+#define inc_mm_counter_fast(mm, member) add_mm_counter_fast(mm, member, 1)
+#define dec_mm_counter_fast(mm, member) add_mm_counter_fast(mm, member, -1)
+
+/* sync counter once per 64 page faults */
+#define TASK_RSS_EVENTS_THRESH  (64)
+static void check_sync_rss_stat(struct task_struct *task)
+{
+        if (unlikely(task != current))
+                return;
+        if (unlikely(task->rss_stat.events++ > TASK_RSS_EVENTS_THRESH))
+                __sync_task_rss_stat(task, task->mm);
+}
+
+unsigned long get_mm_counter(struct mm_struct *mm, int member)
+{
+        long val = 0;
+
+        /*
+         * Don't use task->mm here...for avoiding to use task_get_mm()..
+         * The caller must guarantee task->mm is not invalid.
+         */
+        val = atomic_long_read(&mm->rss_stat.count[member]);
+        /*
+         * counter is updated in asynchronous manner and may go to minus.
+         * But it's never be expected number for users.
+         */
+        if (val < 0)
+                return 0;
+        return (unsigned long)val;
+}
+
+void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
+{
+        __sync_task_rss_stat(task, mm);
+}
+#else
+
+#define inc_mm_counter_fast(mm, member) inc_mm_counter(mm, member)
+#define dec_mm_counter_fast(mm, member) dec_mm_counter(mm, member)
+
+static void check_sync_rss_stat(struct task_struct *task)
+{
+}
+
+void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
+{
+}
+#endif
+
 /*
  * If a p?d_bad entry is found while walking page tables, report
  * the error, before resetting entry to p?d_none.  Usually (but
@@ -386,6 +459,8 @@ static inline void add_mm_rss_vec(struct mm_struct *mm, int *rss)
 {
         int i;
 
+        if (current->mm == mm)
+                sync_mm_rss(current, mm);
         for (i = 0; i < NR_MM_COUNTERS; i++)
                 if (rss[i])
                         add_mm_counter(mm, i, rss[i]);
@@ -1539,7 +1614,7 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
 
         /* Ok, finally just insert the thing.. */
         get_page(page);
-        inc_mm_counter(mm, MM_FILEPAGES);
+        inc_mm_counter_fast(mm, MM_FILEPAGES);
         page_add_file_rmap(page);
         set_pte_at(mm, addr, pte, mk_pte(page, prot));
 
@@ -2175,11 +2250,11 @@ gotten:
         if (likely(pte_same(*page_table, orig_pte))) {
                 if (old_page) {
                         if (!PageAnon(old_page)) {
-                                dec_mm_counter(mm, MM_FILEPAGES);
-                                inc_mm_counter(mm, MM_ANONPAGES);
+                                dec_mm_counter_fast(mm, MM_FILEPAGES);
+                                inc_mm_counter_fast(mm, MM_ANONPAGES);
                         }
                 } else
-                        inc_mm_counter(mm, MM_ANONPAGES);
+                        inc_mm_counter_fast(mm, MM_ANONPAGES);
                 flush_cache_page(vma, address, pte_pfn(orig_pte));
                 entry = mk_pte(new_page, vma->vm_page_prot);
                 entry = maybe_mkwrite(pte_mkdirty(entry), vma);
@@ -2616,7 +2691,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
          * discarded at swap_free().
          */
 
-        inc_mm_counter(mm, MM_ANONPAGES);
+        inc_mm_counter_fast(mm, MM_ANONPAGES);
         pte = mk_pte(page, vma->vm_page_prot);
         if ((flags & FAULT_FLAG_WRITE) && reuse_swap_page(page)) {
                 pte = maybe_mkwrite(pte_mkdirty(pte), vma);
@@ -2700,7 +2775,7 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
         if (!pte_none(*page_table))
                 goto release;
 
-        inc_mm_counter(mm, MM_ANONPAGES);
+        inc_mm_counter_fast(mm, MM_ANONPAGES);
         page_add_new_anon_rmap(page, vma, address);
 setpte:
         set_pte_at(mm, address, page_table, entry);
@@ -2854,10 +2929,10 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                 if (flags & FAULT_FLAG_WRITE)
                         entry = maybe_mkwrite(pte_mkdirty(entry), vma);
                 if (anon) {
-                        inc_mm_counter(mm, MM_ANONPAGES);
+                        inc_mm_counter_fast(mm, MM_ANONPAGES);
                         page_add_new_anon_rmap(page, vma, address);
                 } else {
-                        inc_mm_counter(mm, MM_FILEPAGES);
+                        inc_mm_counter_fast(mm, MM_FILEPAGES);
                         page_add_file_rmap(page);
                         if (flags & FAULT_FLAG_WRITE) {
                                 dirty_page = page;
@@ -3035,6 +3110,9 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 
         count_vm_event(PGFAULT);
 
+        /* do counter updates before entering really critical section. */
+        check_sync_rss_stat(current);
+
         if (unlikely(is_vm_hugetlb_page(vma)))
                 return hugetlb_fault(mm, vma, address, flags);