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btrfs: keep track of discardable_bytes for async discard

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Keep track of this metric so that we can understand how ahead or behind
we are in discarding rate. This uses the same accounting method as
discardable_extents, deltas between previous/current values and
propagating them up.

Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Dennis Zhou
2019-12-13 16:22:21 -08:00
committed by David Sterba
parent dfb79ddb13
commit 5dc7c10b87
5 changed files with 56 additions and 9 deletions
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1
fs/btrfs/free-space-cache.h
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@@ -52,6 +52,7 @@ struct btrfs_free_space_ctl {
int unit;
u64 start;
s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
const struct btrfs_free_space_op *op;
void *private;
struct mutex cache_writeout_mutex;