[PATCH] initialise total_memory() earlier

[safe/jmp/linux-2.6] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index c1052ee..8ccf6f1 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -72,13 +72,12 @@ int dirty_background_ratio = 10;
 int vm_dirty_ratio = 40;
 
 /*
- * The interval between `kupdate'-style writebacks, in centiseconds
- * (hundredths of a second)
+ * The interval between `kupdate'-style writebacks, in jiffies
  */
 int dirty_writeback_interval = 5 * HZ;
 
 /*
- * The longest number of centiseconds for which data is allowed to remain dirty
+ * The longest number of jiffies for which data is allowed to remain dirty
  */
 int dirty_expire_interval = 30 * HZ;
 
@@ -205,6 +204,7 @@ static void balance_dirty_pages(struct address_space *mapping)
                        .sync_mode      = WB_SYNC_NONE,
                        .older_than_this = NULL,
                        .nr_to_write    = write_chunk,
+                       .range_cyclic   = 1,
                };
 
                get_dirty_limits(&wbs, &background_thresh,
@@ -256,8 +256,9 @@ static void balance_dirty_pages(struct address_space *mapping)
 }
 
 /**
- * balance_dirty_pages_ratelimited - balance dirty memory state
+ * balance_dirty_pages_ratelimited_nr - balance dirty memory state
  * @mapping: address_space which was dirtied
+ * @nr_pages_dirtied: number of pages which the caller has just dirtied
  *
  * Processes which are dirtying memory should call in here once for each page
  * which was newly dirtied.  The function will periodically check the system's
@@ -268,10 +269,12 @@ static void balance_dirty_pages(struct address_space *mapping)
  * limit we decrease the ratelimiting by a lot, to prevent individual processes
  * from overshooting the limit by (ratelimit_pages) each.
  */
-void balance_dirty_pages_ratelimited(struct address_space *mapping)
+void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
+                                       unsigned long nr_pages_dirtied)
 {
-       static DEFINE_PER_CPU(int, ratelimits) = 0;
-       long ratelimit;
+       static DEFINE_PER_CPU(unsigned long, ratelimits) = 0;
+       unsigned long ratelimit;
+       unsigned long *p;
 
        ratelimit = ratelimit_pages;
        if (dirty_exceeded)
@@ -281,15 +284,18 @@ void balance_dirty_pages_ratelimited(struct address_space *mapping)
         * Check the rate limiting. Also, we do not want to throttle real-time
         * tasks in balance_dirty_pages(). Period.
         */
-       if (get_cpu_var(ratelimits)++ >= ratelimit) {
-               __get_cpu_var(ratelimits) = 0;
-               put_cpu_var(ratelimits);
+       preempt_disable();
+       p =  &__get_cpu_var(ratelimits);
+       *p += nr_pages_dirtied;
+       if (unlikely(*p >= ratelimit)) {
+               *p = 0;
+               preempt_enable();
                balance_dirty_pages(mapping);
                return;
        }
-       put_cpu_var(ratelimits);
+       preempt_enable();
 }
-EXPORT_SYMBOL(balance_dirty_pages_ratelimited);
+EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr);
 
 void throttle_vm_writeout(void)
 {
@@ -326,6 +332,7 @@ static void background_writeout(unsigned long _min_pages)
                .older_than_this = NULL,
                .nr_to_write    = 0,
                .nonblocking    = 1,
+               .range_cyclic   = 1,
        };
 
        for ( ; ; ) {
@@ -402,6 +409,7 @@ static void wb_kupdate(unsigned long arg)
                .nr_to_write    = 0,
                .nonblocking    = 1,
                .for_kupdate    = 1,
+               .range_cyclic   = 1,
        };
 
        sync_supers();
@@ -622,8 +630,6 @@ EXPORT_SYMBOL(write_one_page);
  */
 int __set_page_dirty_nobuffers(struct page *page)
 {
-       int ret = 0;
-
        if (!TestSetPageDirty(page)) {
                struct address_space *mapping = page_mapping(page);
                struct address_space *mapping2;
@@ -645,8 +651,9 @@ int __set_page_dirty_nobuffers(struct page *page)
                                                        I_DIRTY_PAGES);
                        }
                }
+               return 1;
        }
-       return ret;
+       return 0;
 }
 EXPORT_SYMBOL(__set_page_dirty_nobuffers);
 
@@ -676,8 +683,10 @@ int fastcall set_page_dirty(struct page *page)
                        return (*spd)(page);
                return __set_page_dirty_buffers(page);
        }
-       if (!PageDirty(page))
-               SetPageDirty(page);
+       if (!PageDirty(page)) {
+               if (!TestSetPageDirty(page))
+                       return 1;
+       }
        return 0;
 }
 EXPORT_SYMBOL(set_page_dirty);