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btrfs: add kbps discard rate limit for async discard

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Provide the ability to rate limit based on kbps in addition to iops as
additional guides for the target discard rate. The delay used ends up
being max(kbps_delay, iops_delay).

Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Dennis Zhou
2020-01-02 16:26:36 -05:00
committed by David Sterba
parent a230930084
commit e93591bb6e
3 changed files with 54 additions and 2 deletions
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2
fs/btrfs/ctree.h
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@@ -466,10 +466,12 @@ struct btrfs_discard_ctl {
spinlock_t lock;
struct btrfs_block_group *block_group;
struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
u64 prev_discard;
atomic_t discardable_extents;
atomic64_t discardable_bytes;
unsigned long delay;
u32 iops_limit;
u32 kbps_limit;
};
/* delayed seq elem */