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| author | Naohiro Aota <naohiro.aota@wdc.com> | 2021-11-11 08:14:38 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-01-03 17:09:44 +0300 |
| commit | 16beac87e95e2fb278b552397c8260637f8a63f7 (patch) | |
| tree | e910dca597ba55b01665ef97b6fc812f9245984a /fs/btrfs/volumes.c | |
| parent | d21deec5e7e6f9b02259cff171cbf1e53fb98429 (diff) | |
| download | linux-16beac87e95e2fb278b552397c8260637f8a63f7.tar.xz | |
btrfs: zoned: cache reported zone during mount
When mounting a device, we are reporting the zones twice: once for
checking the zone attributes in btrfs_get_dev_zone_info and once for
loading block groups' zone info in
btrfs_load_block_group_zone_info(). With a lot of block groups, that
leads to a lot of REPORT ZONE commands and slows down the mount
process.
This patch introduces a zone info cache in struct
btrfs_zoned_device_info. The cache is populated while in
btrfs_get_dev_zone_info() and used for
btrfs_load_block_group_zone_info() to reduce the number of REPORT ZONE
commands. The zone cache is then released after loading the block
groups, as it will not be much effective during the run time.
Benchmark: Mount an HDD with 57,007 block groups
Before patch: 171.368 seconds
After patch: 64.064 seconds
While it still takes a minute due to the slowness of loading all the
block groups, the patch reduces the mount time by 1/3.
Link: https://lore.kernel.org/linux-btrfs/CAHQ7scUiLtcTqZOMMY5kbWUBOhGRwKo6J6wYPT5WY+C=cD49nQ@mail.gmail.com/
Fixes: 5b316468983d ("btrfs: get zone information of zoned block devices")
CC: stable@vger.kernel.org
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 53753e04af14..cafd490da072 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2669,7 +2669,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path device->fs_info = fs_info; device->bdev = bdev; - ret = btrfs_get_dev_zone_info(device); + ret = btrfs_get_dev_zone_info(device, false); if (ret) goto error_free_device; |