diff options
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r-- | mm/page-writeback.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index eb59f7eea508..308757ae508d 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -967,6 +967,7 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi, unsigned long pos_ratio; unsigned long step; unsigned long x; + unsigned long shift; /* * The dirty rate will match the writeout rate in long term, except @@ -1094,11 +1095,11 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi, * rate itself is constantly fluctuating. So decrease the track speed * when it gets close to the target. Helps eliminate pointless tremors. */ - step >>= dirty_ratelimit / (2 * step + 1); - /* - * Limit the tracking speed to avoid overshooting. - */ - step = (step + 7) / 8; + shift = dirty_ratelimit / (2 * step + 1); + if (shift < BITS_PER_LONG) + step = DIV_ROUND_UP(step >> shift, 8); + else + step = 0; if (dirty_ratelimit < balanced_dirty_ratelimit) dirty_ratelimit += step; |