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btrfs: add tracking of read blocks for read policy

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Track number of read blocks in the whole filesystem. The counter is
initialized when devices are opened. The counter is increased at
btrfs_submit_dev_bio() if the stats tracking is enabled (depends on the
read policy).  Stats tracking is disabled by default and is enabled
through fs_devices::collect_fs_stats when required.

The code is not under the EXPERIMENTAL define, as stats can be expanded
to include write counts and other performance counters, with the user
interface independent of its internal use.

This is an in-memory-only feature, not related to the dev error stats.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2025-01-02 02:06:34 +08:00 committed by David Sterba
parent b6bed20ed3
commit 22fb0d99c9
4 changed files with 18 additions and 0 deletions
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8
fs/btrfs/bio.c
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@ -453,6 +453,14 @@ static void btrfs_submit_dev_bio(struct btrfs_device *dev, struct bio *bio)
(unsigned long)dev->bdev->bd_dev, btrfs_dev_name(dev),
dev->devid, bio->bi_iter.bi_size);
/*
* Track reads if tracking is enabled; ignore I/O operations before the
* filesystem is fully initialized.
*/
if (dev->fs_devices->collect_fs_stats && bio_op(bio) == REQ_OP_READ && dev->fs_info)
percpu_counter_add(&dev->fs_info->stats_read_blocks,
bio->bi_iter.bi_size >> dev->fs_info->sectorsize_bits);
if (bio->bi_opf & REQ_BTRFS_CGROUP_PUNT)
blkcg_punt_bio_submit(bio);
else

5
fs/btrfs/disk-io.c
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@ -1258,6 +1258,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
{
struct percpu_counter *em_counter = &fs_info->evictable_extent_maps;
percpu_counter_destroy(&fs_info->stats_read_blocks);
percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
percpu_counter_destroy(&fs_info->delalloc_bytes);
percpu_counter_destroy(&fs_info->ordered_bytes);
@ -2923,6 +2924,10 @@ static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block
if (ret)
return ret;
ret = percpu_counter_init(&fs_info->stats_read_blocks, 0, GFP_KERNEL);
if (ret)
return ret;
fs_info->dirty_metadata_batch = PAGE_SIZE *
(1 + ilog2(nr_cpu_ids));

3
fs/btrfs/fs.h
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@ -627,6 +627,9 @@ struct btrfs_fs_info {
struct kobject *qgroups_kobj;
struct kobject *discard_kobj;
/* Track the number of blocks (sectors) read by the filesystem. */
struct percpu_counter stats_read_blocks;
/* Used to keep from writing metadata until there is a nice batch */
struct percpu_counter dirty_metadata_bytes;
struct percpu_counter delalloc_bytes;

2
fs/btrfs/volumes.h
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@ -417,6 +417,8 @@ struct btrfs_fs_devices {
bool seeding;
/* The mount needs to use a randomly generated fsid. */
bool temp_fsid;
/* Enable/disable the filesystem stats tracking. */
bool collect_fs_stats;
struct btrfs_fs_info *fs_info;
/* sysfs kobjects */