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| author | Stefan Roesch <shr@devkernel.io> | 2022-11-18 16:52:13 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-30 15:59:06 -0800 |
| commit | 2c44af4f2aaa260199f218f11920c406e688693c (patch) | |
| tree | 451d6696f74f211e895f8e64dc78499de26ca6b7 /mm | |
| parent | 54790f30fea74247e2f38b4a632ee3dc2fe42d86 (diff) | |
| download | linux-stable-2c44af4f2aaa260199f218f11920c406e688693c.tar.gz linux-stable-2c44af4f2aaa260199f218f11920c406e688693c.tar.bz2 linux-stable-2c44af4f2aaa260199f218f11920c406e688693c.zip | |
mm: add bdi_set_min_ratio_no_scale() function
This introduces bdi_set_min_ratio_no_scale(). It uses the max
granularity for the ratio. This function by the new sysfs knob
min_ratio_fine.
Link: https://lkml.kernel.org/r/20221119005215.3052436-19-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 'mm')
| -rw-r--r-- | mm/page-writeback.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index f44ade72966c..ad608ef2a243 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -690,6 +690,8 @@ static int __bdi_set_min_ratio(struct backing_dev_info *bdi, unsigned int min_ra unsigned int delta; int ret = 0; + if (min_ratio > 100 * BDI_RATIO_SCALE) + return -EINVAL; min_ratio *= BDI_RATIO_SCALE; spin_lock_bh(&bdi_lock); @@ -734,6 +736,11 @@ static int __bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ra return ret; } +int bdi_set_min_ratio_no_scale(struct backing_dev_info *bdi, unsigned int min_ratio) +{ + return __bdi_set_min_ratio(bdi, min_ratio); +} + int bdi_set_max_ratio_no_scale(struct backing_dev_info *bdi, unsigned int max_ratio) { return __bdi_set_max_ratio(bdi, max_ratio); |