Tang Junhui a8394090a9 bcache: correct cache_dirty_target in __update_writeback_rate() ... __update_write_rate() uses a Proportion-Differentiation Controller algorithm to control writeback rate. A dirty target number is used in this PD controller to control writeback rate. A larger target number will make the writeback rate smaller, on the versus, a smaller target number will make the writeback rate larger. bcache uses the following steps to calculate the target number, 1) cache_sectors = all-buckets-of-cache-set * buckets-size 2) cache_dirty_target = cache_sectors * cached-device-writeback_percent 3) target = cache_dirty_target * (sectors-of-cached-device/sectors-of-all-cached-devices-of-this-cache-set) The calculation at step 1) for cache_sectors is incorrect, which does not consider dirty blocks occupied by flash only volume. A flash only volume can be took as a bcache device without cached device. All data sectors allocated for it are persistent on cache device and marked dirty, they are not touched by bcache writeback and garbage collection code. So data blocks of flash only volume should be ignore when calculating cache_sectors of cache set. Current code does not subtract dirty sectors of flash only volume, which results a larger target number from the above 3 steps. And in sequence the cache device's writeback rate is smaller then a correct value, writeback speed is slower on all cached devices. This patch fixes the incorrect slower writeback rate by subtracting dirty sectors of flash only volumes in __update_writeback_rate(). (Commit log composed by Coly Li to pass checkpatch.pl checking) Signed-off-by: Tang Junhui <tang.junhui@zte.com.cn> Reviewed-by: Coly Li <colyli@suse.de> Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>		2017-09-06 08:17:33 -06:00
..
bcache	bcache: correct cache_dirty_target in __update_writeback_rate()	2017-09-06 08:17:33 -06:00
persistent-data	dm space map disk: fix some book keeping in the disk space map	2017-05-15 15:09:50 -04:00
bitmap.c	md/bitmap: don't read page from device with Bitmap_sync	2017-07-10 10:30:41 -07:00
bitmap.h
dm-bio-prison-v1.c	dm bio prison: use rb_entry() rather than container_of()	2017-06-19 11:03:50 -04:00
dm-bio-prison-v1.h	block: switch bios to blk_status_t	2017-06-09 09:27:32 -06:00
dm-bio-prison-v2.c	dm bio prison: use rb_entry() rather than container_of()	2017-06-19 11:03:50 -04:00
dm-bio-prison-v2.h
dm-bio-record.h	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-bufio.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-bufio.h
dm-builtin.c
dm-cache-background-tracker.c	dm cache: handle kmalloc failure allocating background_tracker struct	2017-05-17 09:44:53 -04:00
dm-cache-background-tracker.h
dm-cache-block-types.h
dm-cache-metadata.c	dm cache metadata: fail operations if fail_io mode has been established	2017-05-05 14:40:13 -04:00
dm-cache-metadata.h
dm-cache-policy-internal.h
dm-cache-policy-smq.c	dm cache policy smq: don't do any writebacks unless IDLE	2017-05-14 21:54:33 -04:00
dm-cache-policy.c
dm-cache-policy.h
dm-cache-target.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-core.h	dm: add basic support for using the select or poll function	2017-06-19 11:03:49 -04:00
dm-crypt.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-delay.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-era-target.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-exception-store.c
dm-exception-store.h
dm-flakey.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-integrity.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-io.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-ioctl.c	dm ioctl: report event number in DM_LIST_DEVICES	2017-06-19 11:03:50 -04:00
dm-kcopyd.c	dm kcopyd: add sequential write feature	2017-06-19 11:03:51 -04:00
dm-linear.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-log.c
dm-mpath.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid.c	dm raid: bump target version	2017-07-25 14:54:20 -04:00
dm-raid1.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-region-hash.c
dm-round-robin.c
dm-rq.c	blk-mq: use the introduced blk_mq_unquiesce_queue()	2017-06-18 14:20:04 -06:00
dm-rq.h	block: introduce new block status code type	2017-06-09 09:27:32 -06:00
dm-service-time.c
dm-snap-persistent.c	dm: make flush bios explicitly sync	2017-05-31 10:50:23 -04:00
dm-snap-transient.c
dm-snap.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-stats.c	mm: introduce kv[mz]alloc helpers	2017-05-08 17:15:12 -07:00
dm-stats.h
dm-stripe.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-switch.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-sysfs.c
dm-table.c	dm, dax: Make sure dm_dax_flush() is called if device supports it	2017-07-26 15:55:44 -04:00
dm-target.c	dm: don't return errnos from ->map	2017-06-09 09:27:32 -06:00
dm-thin-metadata.c	dm thin metadata: call precommit before saving the roots	2017-05-15 15:09:49 -04:00
dm-thin-metadata.h
dm-thin.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-uevent.c
dm-uevent.h
dm-verity-fec.c	dm verity fec: fix GFP flags used with mempool_alloc()	2017-07-26 15:55:44 -04:00
dm-verity-fec.h
dm-verity-target.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-verity.h	dm verity: switch to using asynchronous hash crypto API	2017-04-24 15:37:04 -04:00
dm-zero.c	dm: don't return errnos from ->map	2017-06-09 09:27:32 -06:00
dm-zoned-metadata.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-zoned-reclaim.c	dm zoned: use GFP_NOIO in I/O path	2017-07-26 15:55:43 -04:00
dm-zoned-target.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm-zoned.h	dm zoned: drive-managed zoned block device target	2017-06-19 11:05:20 -04:00
dm.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
dm.h	dm: introduce enum dm_queue_mode to cleanup related code	2017-04-27 17:08:44 -04:00
faulty.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
Kconfig	dm zoned: drive-managed zoned block device target	2017-06-19 11:05:20 -04:00
linear.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
linear.h
Makefile	dm zoned: drive-managed zoned block device target	2017-06-19 11:05:20 -04:00
md-cluster.c	md-cluster: fix potential lock issue in add_new_disk	2017-05-21 20:37:09 -07:00
md-cluster.h
md.c	Linux 4.13-rc7	2017-08-28 13:00:44 -06:00
md.h	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
multipath.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
multipath.h
raid0.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
raid0.h
raid1-10.c	md: raid1-10: move raid1/raid10 common code into raid1-10.c	2017-07-21 12:47:20 -07:00
raid1.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
raid1.h	md/raid1: Use a new variable to count flighting sync requests	2017-04-27 14:01:16 -07:00
raid5-cache.c	Linux 4.13-rc7	2017-08-28 13:00:44 -06:00
raid5-log.h	md/r5cache: gracefully handle journal device errors for writeback mode	2017-05-11 22:11:11 -07:00
raid5-ppl.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
raid5.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
raid5.h	- A major update for DM cache that reduces the latency for deciding	2017-05-03 10:31:20 -07:00
raid10.c	block: replace bi_bdev with a gendisk pointer and partitions index	2017-08-23 12:49:55 -06:00
raid10.h	md/raid10: simplify the splitting of requests.	2017-04-11 10:13:02 -07:00