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Coly Li 247acf4308 bcache: at least try to shrink 1 node in bch_mca_scan() 
[ Upstream commit 9fcc34b1a6 ]

In bch_mca_scan(), the number of shrinking btree node is calculated
by code like this,
	unsigned long nr = sc->nr_to_scan;

        nr /= c->btree_pages;
        nr = min_t(unsigned long, nr, mca_can_free(c));
variable sc->nr_to_scan is number of objects (here is bcache B+tree
nodes' number) to shrink, and pointer variable sc is sent from memory
management code as parametr of a callback.

If sc->nr_to_scan is smaller than c->btree_pages, after the above
calculation, variable 'nr' will be 0 and nothing will be shrunk. It is
frequeently observed that only 1 or 2 is set to sc->nr_to_scan and make
nr to be zero. Then bch_mca_scan() will do nothing more then acquiring
and releasing mutex c->bucket_lock.

This patch checkes whether nr is 0 after the above calculation, if 0
is the result then set 1 to variable 'n'. Then at least bch_mca_scan()
will try to shrink a single B+tree node.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04 19:12:58 +01:00
..
bcache bcache: at least try to shrink 1 node in bch_mca_scan() 2020-01-04 19:12:58 +01:00
persistent-data dm btree: increase rebalance threshold in __rebalance2() 2019-12-21 10:57:41 +01:00
dm-bio-prison-v1.c
dm-bio-prison-v1.h
dm-bio-prison-v2.c
dm-bio-prison-v2.h
dm-bio-record.h
dm-bufio.c Revert "dm bufio: fix deadlock with loop device" 2019-08-29 08:28:49 +02:00
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 2019-05-25 18:23:38 +02:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c dm cache: fix bugs when a GFP_NOWAIT allocation fails 2019-10-29 09:20:03 +01:00
dm-core.h dm: disable DISCARD if the underlying storage no longer supports it 2019-08-25 10:48:01 +02:00
dm-crypt.c dm crypt: move detailed message into debug level 2019-09-16 08:22:14 +02:00
dm-delay.c dm delay: fix a crash when invalid device is specified 2019-05-25 18:23:39 +02:00
dm-era-target.c
dm-exception-store.c
dm-exception-store.h
dm-flakey.c dm flakey: Properly corrupt multi-page bios. 2019-12-05 09:20:36 +01:00
dm-integrity.c dm integrity: fix a crash due to BUG_ON in __journal_read_write() 2019-08-29 08:28:55 +02:00
dm-io.c
dm-ioctl.c dm ioctl: harden copy_params()'s copy_from_user() from malicious users 2018-11-13 11:08:49 -08:00
dm-kcopyd.c dm kcopyd: always complete failed jobs 2019-08-29 08:28:55 +02:00
dm-linear.c dm: Check for device sector overflow if CONFIG_LBDAF is not set 2019-01-26 09:32:42 +01:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c dm log writes: make sure super sector log updates are written in order 2019-07-03 13:14:45 +02:00
dm-log.c
dm-mpath.c dm mpath: remove harmful bio-based optimization 2019-12-21 10:57:40 +01:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid.c dm raid: fix false -EBUSY when handling check/repair message 2019-12-05 09:20:37 +01:00
dm-raid1.c dm: Check for device sector overflow if CONFIG_LBDAF is not set 2019-01-26 09:32:42 +01:00
dm-region-hash.c
dm-round-robin.c
dm-rq.c blk-mq: add callback of .cleanup_rq 2019-10-05 13:10:03 +02:00
dm-rq.h
dm-service-time.c
dm-snap-persistent.c
dm-snap-transient.c
dm-snap.c dm snapshot: rework COW throttling to fix deadlock 2019-11-06 13:05:11 +01:00
dm-stats.c
dm-stats.h
dm-stripe.c
dm-switch.c
dm-sysfs.c
dm-table.c dm table: fix invalid memory accesses with too high sector number 2019-08-29 08:28:56 +02:00
dm-target.c dm mpath: fix missing call of path selector type->end_io 2019-09-16 08:22:12 +02:00
dm-thin-metadata.c dm thin metadata: check if in fail_io mode when setting needs_check 2019-09-16 08:22:21 +02:00
dm-thin-metadata.h dm thin: fix passdown_double_checking_shared_status() 2019-01-31 08:14:38 +01:00
dm-thin.c dm thin: add sanity checks to thin-pool and external snapshot creation 2019-04-05 22:32:59 +02:00
dm-uevent.c
dm-uevent.h
dm-unstripe.c dm: Check for device sector overflow if CONFIG_LBDAF is not set 2019-01-26 09:32:42 +01:00
dm-verity-fec.c
dm-verity-fec.h
dm-verity-target.c dm verity: use message limit for data block corruption message 2019-07-21 09:03:08 +02:00
dm-verity.h
dm-writecache.c dm writecache: handle REQ_FUA 2019-12-17 20:34:52 +01:00
dm-zero.c
dm-zoned-metadata.c dm zoned: reduce overhead of backing device checks 2019-12-17 20:34:53 +01:00
dm-zoned-reclaim.c dm zoned: reduce overhead of backing device checks 2019-12-17 20:34:53 +01:00
dm-zoned-target.c dm zoned: reduce overhead of backing device checks 2019-12-17 20:34:53 +01:00
dm-zoned.h dm zoned: reduce overhead of backing device checks 2019-12-17 20:34:53 +01:00
dm.c dm: disable DISCARD if the underlying storage no longer supports it 2019-08-25 10:48:01 +02:00
dm.h
Kconfig
Makefile
md-bitmap.c md/bitmap: avoid race window between md_bitmap_resize and bitmap_file_clear_bit 2019-12-31 16:35:25 +01:00
md-bitmap.h
md-cluster.c md-cluster: release RESYNC lock after the last resync message 2018-08-31 17:38:10 -07:00
md-cluster.h
md-faulty.c
md-linear.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
md-linear.h
md-multipath.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
md-multipath.h
md.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
md.h md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
raid0.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
raid0.h md/raid0: avoid RAID0 data corruption due to layout confusion. 2019-10-05 13:10:12 +02:00
raid1-10.c
raid1.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
raid1.h
raid5-cache.c md/raid5: fix 'out of memory' during raid cache recovery 2019-02-06 17:30:16 +01:00
raid5-log.h
raid5-ppl.c
raid5.c raid5: need to set STRIPE_HANDLE for batch head 2019-12-17 20:36:00 +01:00
raid5.h
raid10.c md: improve handling of bio with REQ_PREFLUSH in md_flush_request() 2019-12-17 20:34:55 +01:00
raid10.h