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mm: add bdi_set_max_ratio_no_scale() function 

This introduces bdi_set_max_ratio_no_scale(). It uses the max
granularity for the ratio. This function by the new sysfs knob
max_ratio_fine.

Link: https://lkml.kernel.org/r/20221119005215.3052436-16-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 16:52:10 -08:00 committed by Andrew Morton
parent 9c832a8d57
commit 4e230b406e
2 changed files with 9 additions and 3 deletions
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1
include/linux/backing-dev.h
View File

@ -109,6 +109,7 @@ 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);
int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio);
int bdi_set_min_bytes(struct backing_dev_info *bdi, u64 min_bytes);
int bdi_set_max_bytes(struct backing_dev_info *bdi, u64 max_bytes);
int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit);

11
mm/page-writeback.c
View File

@ -719,6 +719,9 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra
{
int ret = 0;
if (max_ratio > 100 * BDI_RATIO_SCALE)
return -EINVAL;
spin_lock_bh(&bdi_lock);
if (bdi->min_ratio > max_ratio) {
ret = -EINVAL;
@ -731,6 +734,11 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra
return ret;
}
int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio)
{
return __bdi_set_max_ratio(bdi, max_ratio);
}
int bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ratio)
{
return __bdi_set_min_ratio(bdi, min_ratio * BDI_RATIO_SCALE);
@ -738,9 +746,6 @@ 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)
{
if (max_ratio > 100)
return -EINVAL;
return __bdi_set_max_ratio(bdi, max_ratio * BDI_RATIO_SCALE);
}
EXPORT_SYMBOL(bdi_set_max_ratio);