linux_dsm_epyc7002/drivers/md/bcache
Coly Li 141df8bb5d bcache: don't set max writeback rate if gc is running
When gc is running, user space I/O processes may wait inside
bcache code, so no new I/O coming. Indeed this is not a real idle
time, maximum writeback rate should not be set in such situation.
Otherwise a faster writeback thread may compete locks with gc thread
and makes garbage collection slower, which results a longer I/O
freeze period.

This patch checks c->gc_mark_valid in set_at_max_writeback_rate(). If
c->gc_mark_valid is 0 (gc running), set_at_max_writeback_rate() returns
false, then update_writeback_rate() will not set writeback rate to
maximum value even c->idle_counter reaches an idle threshold.

Now writeback thread won't interfere gc thread performance.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-06-28 07:39:13 -06:00
..
alloc.c bcache: avoid clang -Wunintialized warning 2019-04-24 10:56:27 -06:00
bcache.h bcache: option to automatically run gc thread after writeback 2018-12-13 08:15:54 -07:00
bset.c bcache: fix stack corruption by PRECEDING_KEY() 2019-06-13 03:09:14 -06:00
bset.h bcache: fix stack corruption by PRECEDING_KEY() 2019-06-13 03:09:14 -06:00
btree.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
btree.h bcache: introduce force_wake_up_gc() 2018-12-13 08:15:54 -07:00
closure.c bcache: add missing SPDX header 2018-08-11 15:46:42 -06:00
closure.h bcache: fix typo in code comments of closure_return_with_destructor() 2018-10-08 08:19:43 -06:00
debug.c bcache: do not check if debug dentry is ERR or NULL explicitly on remove 2018-12-13 08:15:54 -07:00
debug.h bcache: add identifier names to arguments of function definitions 2018-08-11 15:46:41 -06:00
extents.c bcache: treat stale && dirty keys as bad keys 2019-02-09 07:18:31 -07:00
extents.h bcache: add identifier names to arguments of function definitions 2018-08-11 15:46:41 -06:00
io.c bcache: fix typo 'succesfully' to 'successfully' 2018-08-11 15:46:42 -06:00
journal.c bcache: make is_discard_enabled() static 2019-05-01 06:34:09 -06:00
journal.h bcache: add identifier names to arguments of function definitions 2018-08-11 15:46:41 -06:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
movinggc.c bcache: style fix to add a blank line after declarations 2018-08-11 15:46:41 -06:00
request.c bcache: Clean up bch_get_congested() 2019-04-24 10:56:27 -06:00
request.h bcache: Clean up bch_get_congested() 2019-04-24 10:56:27 -06:00
stats.c bcache: not use hard coded memset size in bch_cache_accounting_clear() 2019-02-09 07:18:31 -07:00
stats.h bcache: add identifier names to arguments of function definitions 2018-08-11 15:46:41 -06:00
super.c bcache: remove redundant LIST_HEAD(journal) from run_cache_set() 2019-04-30 08:20:46 -06:00
sysfs.c bcache: only set BCACHE_DEV_WB_RUNNING when cached device attached 2019-06-13 03:09:15 -06:00
sysfs.h bcache: add sysfs_strtoul_bool() for setting bit-field variables 2019-02-09 07:18:32 -07:00
trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
util.c bcache: avoid to use bio_for_each_segment_all() in bch_bio_alloc_pages() 2019-02-15 08:40:11 -07:00
util.h bcache: Clean up bch_get_congested() 2019-04-24 10:56:27 -06:00
writeback.c bcache: don't set max writeback rate if gc is running 2019-06-28 07:39:13 -06:00
writeback.h bcache: never writeback a discard operation 2019-02-09 07:18:31 -07:00