src/patches/linux-2.6-vmscan_remove_wait_on_page_writeback.patch

   1 --- linux-next.orig/mm/vmscan.c 2010-07-28 16:22:21.000000000 +0800
   2 +++ linux-next/mm/vmscan.c      2010-07-28 16:23:35.000000000 +0800
   3 @@ -324,8 +324,7 @@ typedef enum {
   4   * pageout is called by shrink_page_list() for each dirty page.
   5   * Calls ->writepage().
   6   */
   7 -static pageout_t pageout(struct page *page, struct address_space *mapping,
   8 -                                               enum pageout_io sync_writeback)
   9 +static pageout_t pageout(struct page *page, struct address_space *mapping)
  10  {
  11         /*
  12          * If the page is dirty, only perform writeback if that write
  13 @@ -384,14 +383,6 @@ static pageout_t pageout(struct page *pa
  14                         return PAGE_ACTIVATE;
  15                 }
  16
  17 -               /*
  18 -                * Wait on writeback if requested to. This happens when
  19 -                * direct reclaiming a large contiguous area and the
  20 -                * first attempt to free a range of pages fails.
  21 -                */
  22 -               if (PageWriteback(page) && sync_writeback == PAGEOUT_IO_SYNC)
  23 -                       wait_on_page_writeback(page);
  24 -
  25                 if (!PageWriteback(page)) {
  26                         /* synchronous write or broken a_ops? */
  27                         ClearPageReclaim(page);
  28 @@ -727,7 +718,7 @@ static unsigned long shrink_page_list(st
  29                                 goto keep_locked;
  30
  31                         /* Page is dirty, try to write it out here */
  32 -                       switch (pageout(page, mapping, sync_writeback)) {
  33 +                       switch (pageout(page, mapping)) {
  34                         case PAGE_KEEP:
  35                                 goto keep_locked;
  36                         case PAGE_ACTIVATE:
  37