Merge remote-tracking branch 'ipsec/master'

[karo-tx-linux.git] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 6c7b0187be8e0196719d6baa0839ed9562c3530e..63807583d8e89f1c96f8b05bcf5fe422ed200c26 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1210,11 +1210,11 @@ static unsigned long dirty_poll_interval(unsigned long dirty,
        return 1;
 }
 
-static long bdi_max_pause(struct backing_dev_info *bdi,
-                         unsigned long bdi_dirty)
+static unsigned long bdi_max_pause(struct backing_dev_info *bdi,
+                                  unsigned long bdi_dirty)
 {
-       long bw = bdi->avg_write_bandwidth;
-       long t;
+       unsigned long bw = bdi->avg_write_bandwidth;
+       unsigned long t;
 
        /*
         * Limit pause time for small memory systems. If sleeping for too long
@@ -1226,7 +1226,7 @@ static long bdi_max_pause(struct backing_dev_info *bdi,
        t = bdi_dirty / (1 + bw / roundup_pow_of_two(1 + HZ / 8));
        t++;
 
-       return min_t(long, t, MAX_PAUSE);
+       return min_t(unsigned long, t, MAX_PAUSE);
 }
 
 static long bdi_min_pause(struct backing_dev_info *bdi,
@@ -2143,11 +2143,17 @@ EXPORT_SYMBOL(account_page_dirtied);
 
 /*
  * Helper function for set_page_writeback family.
+ *
+ * The caller must hold mem_cgroup_begin/end_update_page_stat() lock
+ * while calling this function.
+ * See test_set_page_writeback for example.
+ *
  * NOTE: Unlike account_page_dirtied this does not rely on being atomic
  * wrt interrupts.
  */
 void account_page_writeback(struct page *page)
 {
+       mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
        inc_zone_page_state(page, NR_WRITEBACK);
 }
 EXPORT_SYMBOL(account_page_writeback);
@@ -2364,7 +2370,10 @@ int test_clear_page_writeback(struct page *page)
 {
        struct address_space *mapping = page_mapping(page);
        int ret;
+       bool locked;
+       unsigned long memcg_flags;
 
+       mem_cgroup_begin_update_page_stat(page, &locked, &memcg_flags);
        if (mapping) {
                struct backing_dev_info *bdi = mapping->backing_dev_info;
                unsigned long flags;
@@ -2385,9 +2394,11 @@ int test_clear_page_writeback(struct page *page)
                ret = TestClearPageWriteback(page);
        }
        if (ret) {
+               mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
                dec_zone_page_state(page, NR_WRITEBACK);
                inc_zone_page_state(page, NR_WRITTEN);
        }
+       mem_cgroup_end_update_page_stat(page, &locked, &memcg_flags);
        return ret;
 }
 
@@ -2395,7 +2406,10 @@ int test_set_page_writeback(struct page *page)
 {
        struct address_space *mapping = page_mapping(page);
        int ret;
+       bool locked;
+       unsigned long memcg_flags;
 
+       mem_cgroup_begin_update_page_stat(page, &locked, &memcg_flags);
        if (mapping) {
                struct backing_dev_info *bdi = mapping->backing_dev_info;
                unsigned long flags;
@@ -2422,6 +2436,7 @@ int test_set_page_writeback(struct page *page)
        }
        if (!ret)
                account_page_writeback(page);
+       mem_cgroup_end_update_page_stat(page, &locked, &memcg_flags);
        return ret;
 
 }