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mm: add bdi_get_min_bytes() function 

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.

Link: https://lkml.kernel.org/r/20221119005215.3052436-11-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Cc: Chris Mason <clm@meta.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Stefan Roesch 2022-11-18 16:52:05 -08:00 committed by Andrew Morton
parent c354d9268d
commit 712c00d66a
2 changed files with 6 additions and 0 deletions
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1
include/linux/backing-dev.h
View File

@ -105,6 +105,7 @@ static inline unsigned long wb_stat_error(void)
/* BDI ratio is expressed as part per 1000000 for finer granularity. */
#define BDI_RATIO_SCALE 10000
u64 bdi_get_min_bytes(struct backing_dev_info *bdi);
u64 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);

5
mm/page-writeback.c
View File

@ -740,6 +740,11 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio)
}
EXPORT_SYMBOL(bdi_set_max_ratio);
u64 bdi_get_min_bytes(struct backing_dev_info *bdi)
{
return bdi_get_bytes(bdi->min_ratio);
}
u64 bdi_get_max_bytes(struct backing_dev_info *bdi)
{
return bdi_get_bytes(bdi->max_ratio);