diff options
| author | Stefan Roesch <shr@devkernel.io> | 2022-11-19 03:51:59 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-12-01 02:59:03 +0300 |
| commit | ae82291e9ca47c3d6da6b77a00f427754aca413e (patch) | |
| tree | dcec641e986344f31d5b7150ce215cfe3975918a /include | |
| parent | 16b837eb84e6948f92411eb32e97a05f89733ddc (diff) | |
| download | linux-ae82291e9ca47c3d6da6b77a00f427754aca413e.tar.xz | |
mm: use part per 1000000 for bdi ratios
To get finer granularity for ratio calculations use part per million
instead of percentiles. This is especially important if we want to
automatically convert byte values to ratios. Otherwise the values that
are actually used can be quite different. This is also important for
machines with more main memory (1% of 256GB is already 2.5GB).
Link: https://lkml.kernel.org/r/20221119005215.3052436-5-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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/backing-dev.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 9c984ffc8a0a..1b50c028e5ad 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -102,6 +102,9 @@ static inline unsigned long wb_stat_error(void) #endif } +/* BDI ratio is expressed as part per 1000000 for finer granularity. */ +#define BDI_RATIO_SCALE 10000 + 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); int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit); |