HI， guys：
I use kernel 4.1.4, and pached 5 patches on https://git.kernel.org/cgit/linux/kernel/git/mlin/linux.git/log/?h=bcache：;
In bcache_init() function it forgot to unregister reboot notifier if
bcache: fix a livelock in btree lock
fix a leak in bch_cached_dev_run()
bcache: Add a cond_resched() call to gc
bcache: [BUG] clear BCACHE_DEV_UNLINK_DONE flag when attaching a backing device
My problem is once I mount the /dev/bcache0, the util of bcache is very high:
06:14:06 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util
06:14:07 PM sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:14:07 PM sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:14:07 PM sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
06:14:07 PM bcache0 0.00 0.00 0.00 0.00 1456505.00 0.00 0.00 100.00
# ./bcache-status.py -s
--- bcache ---
Device /dev/bcache0 (252:0)
UUID e5f10885-96f1-4ad3-a5ab-6e29a7b21b8d
Block Size 4.00KiB
Bucket Size 2.00MiB
Congested? False
Read Congestion 0.0ms
Write Congestion 0.0ms
Total Cache Size 1733.00GiB
Total Cache Used 1733.00GiB (100%)
Total Cache Unused 0B (0%)
Dirty Data 0B (0%)
Evictable Cache 1733.00GiB (100%)
Replacement Policy [lru] fifo random
Cache Mode writethrough [writeback] writearound none
Total Hits 130 (%)
Total Misses 113246
Total Bypass Hits 78 (100%)
Total Bypass Misses 0
Total Bypassed 35.00MiB
--- Backing Device ---
Device /dev/sdc1 (8:33)
Size 30733.00GiB
Cache Mode writethrough [writeback] writearound none
Readahead 0
Sequential Cutoff 0B
Merge sequential? False
State clean
Writeback? True
Dirty Data 0B
Total Hits 130 (%)
Total Misses 113246
Total Bypass Hits 78 (100%)
Total Bypass Misses 0
Total Bypassed 35.00MiB
--- Cache Device ---
Device /dev/sda1 (8:1)
Size 1733.00GiB
Block Size 4.00KiB
Bucket Size 2.00MiB
Replacement Policy [lru] fifo random
Discard? False
I/O Errors 0
Metadata Written 40.00MiB
Data Written 5.00GiB
Buckets 887783
Cache Used 1733.00GiB (100%)
Cache Unused 0B (0%)
The command line of mounting /dev/bcache0:
# mount -t xfs -o defaults,noatime,nodiratime,nobarrier /dev/bcache0 /data/bcache/
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