On Sat, 30 Nov 2019, Eric Wheeler wrote: > Hi Coly, > > We use 4.19.y and there have been many performance and stability changes > since then. I'm considering backporting the 5.4 version into 4.19 and > wondered: > > Are there any changes in bcache between 4.19 and 5.4 that depend on new > features elsewhere in the kernel, or should I basically be able to copy > the tree from 5.4 to 4.19 and fix minor compilation issues? > > Can you think of any issues that would arise from such a backport? I'm cherry-picking the following into 4.19.86 for our own testing. I reviewed them and they look safe, but let me know if you see something that should be excluded. -Eric ######## testing backports from 5.4.1 for 4.19.86 ######## I diff'ed the git log --oneline's from v4.19..v4.19.86 and v4.19..v5.4 and excluded the duplicates, this is what remained: 752f66a bcache: use REQ_PRIO to indicate bio for metadata 4516da4 bcache: fix typo in code comments of closure_return_with_destructor() 3fd3c5c bcache: remove unused bch_passthrough_cache 91bafdf bcache: remove useless parameter of bch_debug_init() 8792099 bcache: use MAX_CACHES_PER_SET instead of magic number 8 in __bch_bucket_alloc_set f6027bc bcache: split combined if-condition code into separate ones 3a646fd bcache: panic fix for making cache device d2f96f4 bcache: add comment for cache_set->fill_iter ae17102 bcache: do not check if debug dentry is ERR or NULL explicitly on remove 3db4d07 bcache: update comment for bch_data_insert 4e361e0 bcache: update comment in sysfs.c 79b7914 bcache: do not mark writeback_running too early f383ae3 bcache: cannot set writeback_running via sysfs if no writeback kthread created cb07ad6 bcache: introduce force_wake_up_gc() 7a671d8 bcache: option to automatically run gc thread after writeback 009673d bcache: add MODULE_DESCRIPTION information 9aaf516 bcache: make cutoff_writeback and cutoff_writeback_sync tunable cc38ca7 bcache: set writeback_percent in a flexible range e78bd0d bcache: print number of keys in trace_bcache_journal_write 83ff9318 bcache: not use hard coded memset size in bch_cache_accounting_clear() 926d194 bcache: export backing_dev_name via sysfs d461045 bcache: export backing_dev_uuid via sysfs e8cf978 bcache: fix indentation issue, remove tabs on a hunk of code f54478c bcache: fix input integer overflow of congested threshold e4db37f bcache: add sysfs_strtoul_bool() for setting bit-field variables f5c0b95 bcache: use sysfs_strtoul_bool() to set bit-field variables 369d21a bcache: fix input overflow to writeback_delay 453745f bcache: fix input overflow to journal_delay_ms b150084 bcache: fix input overflow to cache set io_error_limit 2e1f4f4 bcache: avoid to use bio_for_each_segment_all() in bch_bio_alloc_pages() 1568ee7 bcache: fix crashes stopping bcache device before read miss done 4e0c04e bcache: fix inaccurate result of unused buckets 792732d bcache: use kmemdup_nul for CACHED_LABEL buffer 3a39472 bcache: Clean up bch_get_congested() 14215ee bcache: move definition of 'int ret' out of macro read_bucket() 2d17456 bcache: add comments for kobj release callback routine 88c12d4 bcache: add error check for calling register_bdev() bb6d355 bcache: Add comments for blkdev_put() in registration code path 63d63b5 bcache: add comments for closure_fn to be called in closure_queue() eb8cbb6 bcache: improve bcache_reboot() f16277c bcache: fix wrong usage use-after-freed on keylist in out_nocoalesce branch of btree_gc_coalesce f936b06 bcache: clean up do_btree_node_write a bit 2d5abb9 bcache: make is_discard_enabled() static 141df8b bcache: don't set max writeback rate if gc is running 0ae49cb bcache: fix return value error in bch_journal_read() e6dcbd3 bcache: avoid flushing btree node in cache_set_flush() if io disabled 08ec1e6 bcache: add io error counting in write_bdev_super_endio() f960fac bcache: remove unnecessary prefetch() in bset_search_tree() 89e0341 bcache: use sysfs_match_string() instead of __sysfs_match_string() 0b13efe bcache: add return value check to bch_cached_dev_run() bd9026c bcache: remove unncessary code in bch_btree_keys_init() 4b6efb4 bcache: more detailed error message to bcache_device_link() 633bb2c bcache: add more error message in bch_cached_dev_attach() e0faa3d bcache: improve error message in bch_cached_dev_run() 68a53c9 bcache: remove "XXX:" comment line from run_cache_set() 944a4f3 bcache: make bset_search_tree() be more understandable 0c277e2 bcache: add pendings_cleanup to stop pending bcache device 5c2a634 bcache: stop writeback kthread and kworker when bch_cached_dev_run() failed a59ff6c bcache: avoid a deadlock in bcache_reboot() 97ba3b8 bcache: acquire bch_register_lock later in cached_dev_detach_finish() 2464b69 bcache: add code comments for journal_read_bucket() a231f07 bcache: set largest seq to ja->seq[bucket_index] in journal_read_bucket() 1df3877 bcache: shrink btree node cache after bch_btree_check() d91ce75 bcache: remove retry_flush_write from struct cache_set 91be66e bcache: performance improvement for btree_flush_write() dff90d5 bcache: add reclaimed_journal_buckets to struct cache_set 5d9e06d bcache: fix possible memory leak in bch_cached_dev_run() 20621fe bcache: Revert "bcache: use sysfs_match_string() instead of __sysfs_match_string()" d55a4ae bcache: add cond_resched() in __bch_cache_cmp() d66c992 bcache: Fix an error code in bch_dump_read() # excluded these (from 5.4), they don't make sense for 4.19 because # bio_for_each_segment_all() hadn't changed yet: 2b070cf block: remove the i argument to bio_for_each_segment_all 6dc4f10 block: allow bio_for_each_segment_all() to iterate over multi-page bvec f936b06 bcache: clean up do_btree_node_write a bit ec8f24b treewide: Add SPDX license identifier - Makefile/Kconfig ######## testing backports from 5.5 for 4.19.86 ######## ]# git log --oneline v5.4..linus/master drivers/md/bcache/ |tac 34cf78b bcache: fix a lost wake-up problem caused by mca_cannibalize_lock 2d88695 bcache: fix static checker warning in bcache_device_free() aaf8dbe bcache: add more accurate error messages in read_super() 41fa4de bcache: deleted code comments for dead code in bch_data_insert_keys() 06c1526 bcache: add code comment bch_keylist_pop() and bch_keylist_pop_front() 84c529a bcache: fix deadlock in bcache_allocator 5dccefd bcache: add code comments in bch_btree_leaf_dirty() c5fcded bcache: add idle_max_writeback_rate sysfs interface 9fcc34b bcache: at least try to shrink 1 node in bch_mca_scan() 651bbba bcache: remove the extra cflags for request.o 15fbb23 bcache: don't export symbols # excluded these (from 5.5): c0e0954 bcache: fix fifo index swapping condition in journal_pin_cmp() 00b8989 Revert "bcache: fix fifo index swapping condition in journal_pin_cmp()" -- Eric Wheeler
