tracing: Append prompt in /debug/tracing/README file

[pandora-kernel.git] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 40ca7cd..30351f0 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -92,14 +92,14 @@ int vm_dirty_ratio = 20;
 unsigned long vm_dirty_bytes;
 
 /*
- * The interval between `kupdate'-style writebacks, in jiffies
+ * The interval between `kupdate'-style writebacks
  */
-int dirty_writeback_interval = 5 * HZ;
+unsigned int dirty_writeback_interval = 5 * 100; /* sentiseconds */
 
 /*
- * The longest number of jiffies for which data is allowed to remain dirty
+ * The longest time for which data is allowed to remain dirty
  */
-int dirty_expire_interval = 30 * HZ;
+unsigned int dirty_expire_interval = 30 * 100; /* sentiseconds */
 
 /*
  * Flag that makes the machine dump writes/reads and block dirtyings.
@@ -770,9 +770,9 @@ static void wb_kupdate(unsigned long arg)
 
        sync_supers();
 
-       oldest_jif = jiffies - dirty_expire_interval;
+       oldest_jif = jiffies - msecs_to_jiffies(dirty_expire_interval);
        start_jif = jiffies;
-       next_jif = start_jif + dirty_writeback_interval;
+       next_jif = start_jif + msecs_to_jiffies(dirty_writeback_interval * 10);
        nr_to_write = global_page_state(NR_FILE_DIRTY) +
                        global_page_state(NR_UNSTABLE_NFS) +
                        (inodes_stat.nr_inodes - inodes_stat.nr_unused);
@@ -801,9 +801,10 @@ static void wb_kupdate(unsigned long arg)
 int dirty_writeback_centisecs_handler(ctl_table *table, int write,
        struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
 {
-       proc_dointvec_userhz_jiffies(table, write, file, buffer, length, ppos);
+       proc_dointvec(table, write, file, buffer, length, ppos);
        if (dirty_writeback_interval)
-               mod_timer(&wb_timer, jiffies + dirty_writeback_interval);
+               mod_timer(&wb_timer, jiffies +
+                       msecs_to_jiffies(dirty_writeback_interval * 10));
        else
                del_timer(&wb_timer);
        return 0;
@@ -905,7 +906,8 @@ void __init page_writeback_init(void)
 {
        int shift;
 
-       mod_timer(&wb_timer, jiffies + dirty_writeback_interval);
+       mod_timer(&wb_timer,
+                 jiffies + msecs_to_jiffies(dirty_writeback_interval * 10));
        writeback_set_ratelimit();
        register_cpu_notifier(&ratelimit_nb);
 
@@ -1197,6 +1199,20 @@ int __set_page_dirty_no_writeback(struct page *page)
        return 0;
 }
 
+/*
+ * Helper function for set_page_dirty family.
+ * NOTE: This relies on being atomic wrt interrupts.
+ */
+void account_page_dirtied(struct page *page, struct address_space *mapping)
+{
+       if (mapping_cap_account_dirty(mapping)) {
+               __inc_zone_page_state(page, NR_FILE_DIRTY);
+               __inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
+               task_dirty_inc(current);
+               task_io_account_write(PAGE_CACHE_SIZE);
+       }
+}
+
 /*
  * For address_spaces which do not use buffers.  Just tag the page as dirty in
  * its radix tree.
@@ -1226,13 +1242,7 @@ int __set_page_dirty_nobuffers(struct page *page)
                if (mapping2) { /* Race with truncate? */
                        BUG_ON(mapping2 != mapping);
                        WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
-                       if (mapping_cap_account_dirty(mapping)) {
-                               __inc_zone_page_state(page, NR_FILE_DIRTY);
-                               __inc_bdi_stat(mapping->backing_dev_info,
-                                               BDI_RECLAIMABLE);
-                               task_dirty_inc(current);
-                               task_io_account_write(PAGE_CACHE_SIZE);
-                       }
+                       account_page_dirtied(page, mapping);
                        radix_tree_tag_set(&mapping->page_tree,
                                page_index(page), PAGECACHE_TAG_DIRTY);
                }