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btrfs: zoned: make auto-reclaim less aggressive

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The current auto-reclaim algorithm starts reclaiming all block groups
with a zone_unusable value above a configured threshold. This is causing
a lot of reclaim IO even if there would be enough free zones on the
device.

Instead of only accounting a block groups zone_unusable value, also take
the ratio of free and not usable (written as well as zone_unusable)
bytes a device has into account.

Tested-by: Pankaj Raghav <p.raghav@samsung.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2022-03-29 01:56:09 -07:00 committed by David Sterba
parent ef972e7b5e
commit 3687fcb075
3 changed files with 43 additions and 0 deletions
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10
fs/btrfs/block-group.c
View File

@ -1512,6 +1512,13 @@ static int reclaim_bgs_cmp(void *unused, const struct list_head *a,
return bg1->used > bg2->used;
}
static inline bool btrfs_should_reclaim(struct btrfs_fs_info *fs_info)
{
if (btrfs_is_zoned(fs_info))
return btrfs_zoned_should_reclaim(fs_info);
return true;
}
void btrfs_reclaim_bgs_work(struct work_struct *work)
{
struct btrfs_fs_info *fs_info =
@ -1522,6 +1529,9 @@ void btrfs_reclaim_bgs_work(struct work_struct *work)
if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
return;
if (!btrfs_should_reclaim(fs_info))
return;
sb_start_write(fs_info->sb);
if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {

27
fs/btrfs/zoned.c
View File

@ -2073,3 +2073,30 @@ void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info)
}
mutex_unlock(&fs_devices->device_list_mutex);
}
bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info)
{
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
struct btrfs_device *device;
u64 used = 0;
u64 total = 0;
u64 factor;
ASSERT(btrfs_is_zoned(fs_info));
if (fs_info->bg_reclaim_threshold == 0)
return false;
mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
total += device->disk_total_bytes;
used += device->bytes_used;
}
mutex_unlock(&fs_devices->device_list_mutex);
factor = div64_u64(used * 100, total);
return factor >= fs_info->bg_reclaim_threshold;
}

6
fs/btrfs/zoned.h
View File

@ -74,6 +74,7 @@ void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical,
u64 length);
void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg);
void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info);
bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
@ -232,6 +233,11 @@ static inline void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info,
static inline void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg) { }
static inline void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info) { }
static inline bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info)
{
return false;
}
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)