| Message ID | 20221024190603.3987969-11-shr@devkernel.io (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm/block: add bdi sysfs knobs | expand |
On Mon, 24 Oct 2022 12:05:59 -0700 Stefan Roesch <shr@devkernel.io> wrote: > This adds a function to return the specified value for min_bytes. It > converts the stored min_ratio of the bdi to the corresponding bytes > value. This is an approximation as it is based on the value that is > returned by global_dirty_limits(), which can change. The returned > value can be different than the value when the min_bytes value was set. > > ... > > --- a/include/linux/backing-dev.h > +++ b/include/linux/backing-dev.h > @@ -105,6 +105,7 @@ static inline unsigned long wb_stat_error(void) > /* BDI ratio is expressed as part per 1000 for finer granularity. */ > #define BDI_RATIO_SCALE 10 > > +unsigned long long bdi_get_min_bytes(struct backing_dev_info *bdi); u64? > +EXPORT_SYMBOL_GPL(bdi_get_min_bytes); Needed?
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 5eb1ae3410b2..621329f25bbe 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -105,6 +105,7 @@ static inline unsigned long wb_stat_error(void) /* BDI ratio is expressed as part per 1000 for finer granularity. */ #define BDI_RATIO_SCALE 10 +unsigned long long bdi_get_min_bytes(struct backing_dev_info *bdi); unsigned long long bdi_get_max_bytes(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); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 21d7c1880ea8..69fc2866e625 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -740,6 +740,12 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio) } EXPORT_SYMBOL(bdi_set_max_ratio); +unsigned long long bdi_get_min_bytes(struct backing_dev_info *bdi) +{ + return bdi_get_bytes(bdi->min_ratio); +} +EXPORT_SYMBOL_GPL(bdi_get_min_bytes); + unsigned long long bdi_get_max_bytes(struct backing_dev_info *bdi) { return bdi_get_bytes(bdi->max_ratio);
This adds a function to return the specified value for min_bytes. It converts the stored min_ratio of the bdi to the corresponding bytes value. This is an approximation as it is based on the value that is returned by global_dirty_limits(), which can change. The returned value can be different than the value when the min_bytes value was set. Signed-off-by: Stefan Roesch <shr@devkernel.io> --- include/linux/backing-dev.h | 1 + mm/page-writeback.c | 6 ++++++ 2 files changed, 7 insertions(+)