diff options
Diffstat (limited to 'include/linux/writeback.h')
| -rw-r--r-- | include/linux/writeback.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h index b625073b80c8..f1bfa12ea246 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -8,6 +8,10 @@ #include <linux/fs.h> /* + * The 1/4 region under the global dirty thresh is for smooth dirty throttling: + * + * (thresh - thresh/DIRTY_FULL_SCOPE, thresh) + * * The 1/16 region above the global dirty limit will be put to maximum pauses: * * (limit, limit + limit/DIRTY_MAXPAUSE_AREA) @@ -25,9 +29,16 @@ * knocks down the global dirty threshold quickly, in which case the global * dirty limit will follow down slowly to prevent livelocking all dirtier tasks. */ +#define DIRTY_SCOPE 8 +#define DIRTY_FULL_SCOPE (DIRTY_SCOPE / 2) #define DIRTY_MAXPAUSE_AREA 16 #define DIRTY_PASSGOOD_AREA 8 +/* + * 4MB minimal write chunk size + */ +#define MIN_WRITEBACK_PAGES (4096UL >> (PAGE_CACHE_SHIFT - 10)) + struct backing_dev_info; /* |