diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/backing-dev.h | 2 | ||||
| -rw-r--r-- | include/linux/proportions.h | 13 |
2 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 9a8965518d1..ad3271d1e90 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -52,6 +52,7 @@ struct backing_dev_info { int dirty_exceeded; unsigned int min_ratio; + unsigned int max_ratio, max_prop_frac; struct device *dev; }; @@ -140,6 +141,7 @@ static inline unsigned long bdi_stat_error(struct backing_dev_info *bdi) } int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio); +int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); /* * Flags in backing_dev_info::capability diff --git a/include/linux/proportions.h b/include/linux/proportions.h index 2c3b3cad92b..5afc1b23346 100644 --- a/include/linux/proportions.h +++ b/include/linux/proportions.h @@ -78,6 +78,19 @@ void prop_inc_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl) } /* + * Limit the time part in order to ensure there are some bits left for the + * cycle counter and fraction multiply. + */ +#define PROP_MAX_SHIFT (3*BITS_PER_LONG/4) + +#define PROP_FRAC_SHIFT (BITS_PER_LONG - PROP_MAX_SHIFT - 1) +#define PROP_FRAC_BASE (1UL << PROP_FRAC_SHIFT) + +void __prop_inc_percpu_max(struct prop_descriptor *pd, + struct prop_local_percpu *pl, long frac); + + +/* * ----- SINGLE ------ */ |