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rue/io: fix child blkcg of hier buffered write can not exceed 2MB 

When using hierarchy buffered_write_bps function, unless explictly
set 0 or a higher value of buffered_write_bps in child blkcg. The
child group can't exceed 2MB by default.

--story=132623821 "child cgroup can not exceed 2MB"

Fixes: f630af7168 ("rue/io: buffered_write_bps hierarchy support")
Reported-by: Zhijian Xu <zhijianxu@tencent.com>
Signed-off-by: Haisu Wang <haisuwang@tencent.com>
This commit is contained in:
Haisu Wang 2024-10-22 23:03:02 +08:00
parent 20c44f01ec
commit a31f981ddb
3 changed files with 10 additions and 6 deletions
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1
block/blk-cgroup.c
View File

@ -1984,6 +1984,7 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
#endif
#ifdef CONFIG_BLK_DEV_THROTTLING_CGROUP_V1
percpu_counter_init(&blkcg->nr_dirtied, 0, GFP_KERNEL);
blkcg->dirty_ratelimit = INIT_DIRTY_BW;
#endif
list_add_tail(&blkcg->all_blkcgs_node, &all_blkcgs);

6
block/blk-throttle.c
View File

@ -1507,12 +1507,6 @@ static int tg_print_rwstat_recursive(struct seq_file *sf, void *v)
}
#ifdef CONFIG_BLK_DEV_THROTTLING_CGROUP_V1
/*
* Initial write bandwidth: 1000 MB/s (wb_init is 100 MB/s)
* The bandwidth will be updated via blkcg_update_bandwidth()
*/
#define INIT_DIRTY_BW (1000 << (20 - PAGE_SHIFT))
static int tg_set_buffered_write_bps(struct cgroup_subsys_state *css,
struct cftype *cft,
u64 val)

9
include/linux/blk-cgroup.h
View File

@ -221,6 +221,15 @@ struct throtl_grp {
};
#ifdef CONFIG_BLK_CGROUP
#ifdef CONFIG_BLK_DEV_THROTTLING_CGROUP_V1
/*
* Initial write bandwidth: 1000 MB/s (wb_init is 100 MB/s)
* The bandwidth will be updated via blkcg_update_bandwidth()
*/
#define INIT_DIRTY_BW (1000 << (20 - PAGE_SHIFT))
#endif
extern struct cgroup_subsys_state * const blkcg_root_css;
void blkcg_schedule_throttle(struct gendisk *disk, bool use_memdelay);