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btrfs: add tracepoints for extent map shrinker events

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Add some tracepoints for the extent map shrinker to help debug and analyse
main events. These have proved useful during development of the shrinker.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2024-04-09 17:07:32 +01:00 committed by David Sterba
parent 65bb9fb00b
commit 0d89a15e1a
3 changed files with 116 additions and 1 deletions
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13
fs/btrfs/extent_map.c
View file

@ -1080,6 +1080,7 @@ static long btrfs_scan_inode(struct btrfs_inode *inode, long *scanned, long nr_t
btrfs_set_inode_full_sync(inode);
remove_extent_mapping(inode, em);
trace_btrfs_extent_map_shrinker_remove_em(inode, em);
/* Drop the reference for the tree. */
free_extent_map(em);
nr_dropped++;
@ -1152,6 +1153,12 @@ long btrfs_free_extent_maps(struct btrfs_fs_info *fs_info, long nr_to_scan)
long nr_dropped = 0;
long scanned = 0;
if (trace_btrfs_extent_map_shrinker_scan_enter_enabled()) {
s64 nr = percpu_counter_sum_positive(&fs_info->evictable_extent_maps);
trace_btrfs_extent_map_shrinker_scan_enter(fs_info, nr_to_scan, nr);
}
while (scanned < nr_to_scan) {
struct btrfs_root *root;
unsigned long count;
@ -1184,5 +1191,11 @@ long btrfs_free_extent_maps(struct btrfs_fs_info *fs_info, long nr_to_scan)
btrfs_put_root(root);
}
if (trace_btrfs_extent_map_shrinker_scan_exit_enabled()) {
s64 nr = percpu_counter_sum_positive(&fs_info->evictable_extent_maps);
trace_btrfs_extent_map_shrinker_scan_exit(fs_info, nr_dropped, nr);
}
return nr_dropped;
}

5
fs/btrfs/super.c
View file

@ -2374,8 +2374,11 @@ static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
static long btrfs_nr_cached_objects(struct super_block *sb, struct shrink_control *sc)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
const s64 nr = percpu_counter_sum_positive(&fs_info->evictable_extent_maps);
return percpu_counter_sum_positive(&fs_info->evictable_extent_maps);
trace_btrfs_extent_map_shrinker_count(fs_info, nr);
return nr;
}
static long btrfs_free_cached_objects(struct super_block *sb, struct shrink_control *sc)

99
include/trace/events/btrfs.h
View file

@ -2537,6 +2537,105 @@ TRACE_EVENT(btrfs_get_raid_extent_offset,
__entry->devid)
);
TRACE_EVENT(btrfs_extent_map_shrinker_count,
TP_PROTO(const struct btrfs_fs_info *fs_info, long nr),
TP_ARGS(fs_info, nr),
TP_STRUCT__entry_btrfs(
__field( long, nr )
),
TP_fast_assign_btrfs(fs_info,
__entry->nr = nr;
),
TP_printk_btrfs("nr=%ld", __entry->nr)
);
TRACE_EVENT(btrfs_extent_map_shrinker_scan_enter,
TP_PROTO(const struct btrfs_fs_info *fs_info, long nr_to_scan, long nr),
TP_ARGS(fs_info, nr_to_scan, nr),
TP_STRUCT__entry_btrfs(
__field( long, nr_to_scan )
__field( long, nr )
__field( u64, last_root_id )
__field( u64, last_ino )
),
TP_fast_assign_btrfs(fs_info,
__entry->nr_to_scan = nr_to_scan;
__entry->nr = nr;
__entry->last_root_id = fs_info->extent_map_shrinker_last_root;
__entry->last_ino = fs_info->extent_map_shrinker_last_ino;
),
TP_printk_btrfs("nr_to_scan=%ld nr=%ld last_root=%llu(%s) last_ino=%llu",
__entry->nr_to_scan, __entry->nr,
show_root_type(__entry->last_root_id), __entry->last_ino)
);
TRACE_EVENT(btrfs_extent_map_shrinker_scan_exit,
TP_PROTO(const struct btrfs_fs_info *fs_info, long nr_dropped, long nr),
TP_ARGS(fs_info, nr_dropped, nr),
TP_STRUCT__entry_btrfs(
__field( long, nr_dropped )
__field( long, nr )
__field( u64, last_root_id )
__field( u64, last_ino )
),
TP_fast_assign_btrfs(fs_info,
__entry->nr_dropped = nr_dropped;
__entry->nr = nr;
__entry->last_root_id = fs_info->extent_map_shrinker_last_root;
__entry->last_ino = fs_info->extent_map_shrinker_last_ino;
),
TP_printk_btrfs("nr_dropped=%ld nr=%ld last_root=%llu(%s) last_ino=%llu",
__entry->nr_dropped, __entry->nr,
show_root_type(__entry->last_root_id), __entry->last_ino)
);
TRACE_EVENT(btrfs_extent_map_shrinker_remove_em,
TP_PROTO(const struct btrfs_inode *inode, const struct extent_map *em),
TP_ARGS(inode, em),
TP_STRUCT__entry_btrfs(
__field( u64, ino )
__field( u64, root_id )
__field( u64, start )
__field( u64, len )
__field( u64, block_start )
__field( u32, flags )
),
TP_fast_assign_btrfs(inode->root->fs_info,
__entry->ino = btrfs_ino(inode);
__entry->root_id = inode->root->root_key.objectid;
__entry->start = em->start;
__entry->len = em->len;
__entry->block_start = em->block_start;
__entry->flags = em->flags;
),
TP_printk_btrfs(
"ino=%llu root=%llu(%s) start=%llu len=%llu block_start=%llu(%s) flags=%s",
__entry->ino, show_root_type(__entry->root_id),
__entry->start, __entry->len,
show_map_type(__entry->block_start),
show_map_flags(__entry->flags))
);
#endif /* _TRACE_BTRFS_H */
/* This part must be outside protection */