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linux/drivers/md
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Coly Li b144e45fc5 bcache: make bch_sectors_dirty_init() to be multithreaded 
When attaching a cached device (a.k.a backing device) to a cache
device, bch_sectors_dirty_init() is called to count dirty sectors
and stripes (see what bcache_dev_sectors_dirty_add() does) on the
cache device.

The counting is done by a single thread recursive function
bch_btree_map_keys() to iterate all the bcache btree nodes.
If the btree has huge number of nodes, bch_sectors_dirty_init() will
take quite long time. In my testing, if the registering cache set has
a existed UUID which matches a already registered cached device, the
automatical attachment during the registration may take more than
55 minutes. This is too long for waiting the bcache to work in real
deployment.

Fortunately when bch_sectors_dirty_init() is called, no other thread
will access the btree yet, it is safe to do a read-only parallelized
dirty sectors counting by multiple threads.

This patch tries to create multiple threads, and each thread tries to
one-by-one count dirty sectors from the sub-tree indexed by a root
node key which the thread fetched. After the sub-tree is counted, the
counting thread will continue to fetch another root node key, until
the fetched key is NULL. How many threads in parallel depends on
the number of keys from the btree root node, and the number of online
CPU core. The thread number will be the less number but no more than
BCH_DIRTY_INIT_THRD_MAX. If there are only 2 keys in root node, it
can only be 2x times faster by this patch. But if there are 10 keys
in the root node, with this patch it can be 10x times faster.

Signed-off-by: Coly Li <colyli@suse.de>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-03-22 10:06:57 -06:00
..
bcache bcache: make bch_sectors_dirty_init() to be multithreaded 2020-03-22 10:06:57 -06:00
persistent-data dm space map common: fix to ensure new block isn't already in use 2020-01-14 20:15:53 -05:00
dm-bio-prison-v1.c dm bio prison: replace spin_lock_irqsave with spin_lock_irq 2019-11-05 14:53:03 -05:00
dm-bio-prison-v1.h
dm-bio-prison-v2.c dm bio prison v2: use true/false for bool variable 2020-01-07 12:07:08 -05:00
dm-bio-prison-v2.h
dm-bio-record.h dm bio record: save/restore bi_end_io and bi_integrity 2020-03-03 10:02:46 -05:00
dm-bufio.c dm bufio: introduce a global cache replacement 2019-09-13 17:00:21 -04:00
dm-builtin.c
dm-cache-background-tracker.c
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c dm cache metadata: Fix loading discard bitset 2019-04-18 16:18:25 -04:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c dm: remove unnecessary unlikely() around WARN_ON_ONCE() 2018-10-16 14:34:59 -04:00
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm: bump version of core and various targets 2020-03-03 11:10:21 -05:00
dm-clone-metadata.c dm clone metadata: Use a two phase commit 2019-12-05 15:27:54 -05:00
dm-clone-metadata.h dm clone metadata: Use a two phase commit 2019-12-05 15:27:54 -05:00
dm-clone-target.c dm clone: Flush destination device before committing metadata 2019-12-05 17:05:23 -05:00
dm-core.h dm: disable DISCARD if the underlying storage no longer supports it 2019-04-04 15:33:59 -04:00
dm-crypt.c dm crypt: fix benbi IV constructor crash if used in authenticated mode 2020-01-14 20:22:47 -05:00
dm-delay.c dm delay: fix a crash when invalid device is specified 2019-04-26 11:29:32 -04:00
dm-dust.c dm dust: change ret to r in dust_map_write 2020-01-07 11:43:36 -05:00
dm-era-target.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
dm-exception-store.c
dm-exception-store.h - Improve DM snapshot target's scalability by using finer grained 2019-05-16 15:55:48 -07:00
dm-flakey.c block: rework zone reporting 2019-11-12 19:12:07 -07:00
dm-init.c docs: device-mapper: move it to the admin-guide 2019-07-15 11:03:01 -03:00
dm-integrity.c dm: bump version of core and various targets 2020-03-03 11:10:21 -05:00
dm-io.c
dm-ioctl.c dm: introduce DM_GET_TARGET_VERSION 2019-09-16 10:18:01 -04:00
dm-kcopyd.c dm kcopyd: always complete failed jobs 2019-08-15 15:57:39 -04:00
dm-linear.c block: rework zone reporting 2019-11-12 19:12:07 -07:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c dm log writes: fix incorrect comment about the logged sequence example 2019-07-09 14:13:33 -04:00
dm-log.c
dm-mpath.c dm: bump version of core and various targets 2020-03-03 11:10:21 -05:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid.c dm raid: table line rebuild status fixes 2020-01-07 11:43:37 -05:00
dm-raid1.c dm raid1: use struct_size() with kzalloc() 2019-08-26 11:05:32 -04:00
dm-region-hash.c
dm-round-robin.c
dm-rq.c block: Delay default elevator initialization 2019-09-05 19:52:34 -06:00
dm-rq.h dm: remove unused _rq_tio_cache and _rq_cache 2019-03-05 14:48:50 -05:00
dm-service-time.c
dm-snap-persistent.c block: fix an integer overflow in logical block size 2020-01-15 21:43:09 -07:00
dm-snap-transient.c
dm-snap.c dm snapshot: use true/false for bool variable 2020-01-07 12:07:17 -05:00
dm-stats.c dm stats: use struct_size() helper 2019-09-04 09:39:22 -04:00
dm-stats.h
dm-stripe.c dm stripe: use struct_size() in kmalloc() 2019-11-05 14:09:59 -05:00
dm-switch.c dm switch: use struct_size() in kzalloc() 2019-03-05 14:48:51 -05:00
dm-sysfs.c dm: remove legacy request-based IO path 2018-10-11 11:36:09 -04:00
dm-table.c block: don't handle bio based drivers in blk_revalidate_disk_zones 2019-12-03 08:51:25 -07:00
dm-target.c dm mpath: fix missing call of path selector type->end_io 2019-04-25 15:38:52 -04:00
dm-thin-metadata.c dm thin metadata: fix lockdep complaint 2020-02-27 12:00:53 -05:00
dm-thin-metadata.h dm thin metadata: Add support for a pre-commit callback 2019-12-05 17:05:24 -05:00
dm-thin.c dm thin: change data device's flush_bio to be member of struct pool 2020-01-14 20:23:13 -05:00
dm-uevent.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
dm-uevent.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
dm-unstripe.c dm: Check for device sector overflow if CONFIG_LBDAF is not set 2018-12-18 09:02:26 -05:00
dm-verity-fec.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dm-verity-fec.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dm-verity-target.c dm: bump version of core and various targets 2020-03-03 11:10:21 -05:00
dm-verity-verify-sig.c dm verity: add root hash pkcs#7 signature verification 2019-08-23 10:13:14 -04:00
dm-verity-verify-sig.h dm verity: add root hash pkcs#7 signature verification 2019-08-23 10:13:14 -04:00
dm-verity.h dm verity: add root hash pkcs#7 signature verification 2019-08-23 10:13:14 -04:00
dm-writecache.c dm: bump version of core and various targets 2020-03-03 11:10:21 -05:00
dm-zero.c
dm-zoned-metadata.c dm zoned: support zone sizes smaller than 128MiB 2020-01-07 11:43:38 -05:00
dm-zoned-reclaim.c dm zoned: reduce overhead of backing device checks 2019-11-07 10:08:36 -05:00
dm-zoned-target.c dm: bump version of core and various targets 2020-03-03 11:10:21 -05:00
dm-zoned.h dm zoned: reduce overhead of backing device checks 2019-11-07 10:08:36 -05:00
dm.c dm: fix congested_fn for request-based device 2020-03-03 11:10:20 -05:00
dm.h dm: make dm_table_find_target return NULL 2019-08-23 10:13:12 -04:00
Kconfig dm: Fix Kconfig indentation 2019-11-20 10:35:31 -05:00
Makefile dm: add clone target 2019-09-12 09:32:31 -04:00
md-bitmap.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-02-08 13:04:49 -08:00
md-bitmap.h
md-cluster.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 45 2019-05-24 17:27:12 +02:00
md-cluster.h md-cluster: introduce resync_info_get interface for sanity check 2018-10-18 09:36:35 -07:00
md-faulty.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 47 2019-05-24 17:27:13 +02:00
md-linear.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-10-24 15:22:40 -07:00
md-linear.h
md-multipath.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-10-24 15:22:40 -07:00
md-multipath.h
md.c md: check arrays is suspended in mddev_detach before call quiesce operations 2020-03-17 10:53:07 -07:00
md.h md: introduce a new struct for IO serialization 2020-01-13 11:44:10 -08:00
raid0.c block: fix an integer overflow in logical block size 2020-01-15 21:43:09 -07:00
raid0.h md/raid0: avoid RAID0 data corruption due to layout confusion. 2019-09-13 13:10:05 -07:00
raid1-10.c md: raid1-10: Unify r{1,10}bio_pool_free 2019-06-15 01:37:35 -06:00
raid1.c md/raid1: introduce wait_for_serialization 2020-01-13 11:44:10 -08:00
raid1.h
raid5-cache.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
raid5-log.h raid5: set write hint for PPL 2019-03-12 10:15:18 -07:00
raid5-ppl.c treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
raid5.c raid5: remove worker_cnt_per_group argument from alloc_thread_groups 2020-01-13 11:44:09 -08:00
raid5.h raid5: use bio_end_sector in r5_next_bio 2019-09-13 13:14:43 -07:00
raid10.c md/raid10: prevent access of uninitialized resync_pages offset 2019-11-11 16:47:39 -08:00
raid10.h