diff options
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index b4edfe7ce06c..2cb01f6ec5d0 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -404,15 +404,18 @@ unsigned long determine_dirtyable_memory(void) * - vm.dirty_background_ratio or vm.dirty_background_bytes * - vm.dirty_ratio or vm.dirty_bytes * The dirty limits will be lifted by 1/4 for PF_LESS_THROTTLE (ie. nfsd) and - * runtime tasks. + * real-time tasks. */ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty) { unsigned long background; unsigned long dirty; - unsigned long available_memory = determine_dirtyable_memory(); + unsigned long uninitialized_var(available_memory); struct task_struct *tsk; + if (!vm_dirty_bytes || !dirty_background_bytes) + available_memory = determine_dirtyable_memory(); + if (vm_dirty_bytes) dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE); else @@ -1103,7 +1106,7 @@ EXPORT_SYMBOL(write_one_page); int __set_page_dirty_no_writeback(struct page *page) { if (!PageDirty(page)) - SetPageDirty(page); + return !TestSetPageDirty(page); return 0; } |