Commit aa121733 authored by Stefan Roesch's avatar Stefan Roesch Committed by Yifan Qiao
Browse files

mm: add bdi_set_min_ratio_no_scale() function 

mainline inclusion
from mainline-v6.2-rc1
commit 2c44af4f
category: feature
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAN96I

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2c44af4f2aaa260199f218f11920c406e688693c

--------------------------------

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: default avatarStefan Roesch <shr@devkernel.io>
Cc: Chris Mason <clm@meta.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarYifan Qiao <qiaoyifan4@huawei.com>
parent db1ce454

include/linux/backing-dev.h

+1 −0
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ 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_min_ratio_no_scale(struct backing_dev_info *bdi, unsigned int min_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);

mm/page-writeback.c

+7 −0
Original line number Diff line number Diff line
@@ -723,6 +723,8 @@ 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);
@@ -767,6 +769,11 @@ 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);