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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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12
fs/btrfs/sysfs.c
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@@ -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,
};