diff mbox series

[RFC,v4,15/20] mm: add bdi_set_max_ratio_no_scale() function

Message ID 20221119005215.3052436-16-shr@devkernel.io (mailing list archive)
State New
Headers show
Series mm/block: add bdi sysfs knobs | expand

Commit Message

Stefan Roesch Nov. 19, 2022, 12:52 a.m. UTC 
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.

Signed-off-by: Stefan Roesch <shr@devkernel.io>
---
 include/linux/backing-dev.h |  1 +
 mm/page-writeback.c         | 11 ++++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 572669758c7f..d9acbb22ff25 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -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);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 3d151e7a9b6c..f44ade72966c 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -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);