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| author | Dennis Zhou <dennis@kernel.org> | 2019-12-13 16:22:21 -0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-01-20 16:40:59 +0100 |
| commit | 5dc7c10b87474c98116d3438739743cd77263e9f (patch) | |
| tree | 3636b859f5228c8df8d777b2b5a4ec9559510978 /fs/btrfs/sysfs.c | |
| parent | dfb79ddb130e0a239e3e90aaf5f5b908555f52bb (diff) | |
| download | linux-5dc7c10b87474c98116d3438739743cd77263e9f.tar.bz2 | |
btrfs: keep track of discardable_bytes for async discard
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>
Diffstat (limited to 'fs/btrfs/sysfs.c')
| -rw-r--r-- | fs/btrfs/sysfs.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 0ac122c67065..ce1da3fcd6c9 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -344,6 +344,17 @@ static const struct attribute_group btrfs_static_feature_attr_group = { */ #define discard_to_fs_info(_kobj) to_fs_info((_kobj)->parent->parent) +static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj, + struct kobj_attribute *a, + char *buf) +{ + struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj); + + return snprintf(buf, PAGE_SIZE, "%lld\n", + atomic64_read(&fs_info->discard_ctl.discardable_bytes)); +} +BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show); + static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) @@ -356,6 +367,7 @@ static ssize_t btrfs_discardable_extents_show(struct kobject *kobj, BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show); static const struct attribute *discard_debug_attrs[] = { + BTRFS_ATTR_PTR(discard, discardable_bytes), BTRFS_ATTR_PTR(discard, discardable_extents), NULL, }; |