diff options
| -rw-r--r-- | drivers/md/bcache/super.c | 40 | ||||
| -rw-r--r-- | drivers/md/bcache/sysfs.c | 7 | ||||
| -rw-r--r-- | drivers/md/bcache/writeback.h | 10 |
3 files changed, 55 insertions, 2 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 61d3b63fa617..4dee119c3664 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -25,6 +25,9 @@ #include <linux/reboot.h> #include <linux/sysfs.h> +unsigned int bch_cutoff_writeback; +unsigned int bch_cutoff_writeback_sync; + static const char bcache_magic[] = { 0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca, 0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 @@ -2420,6 +2423,32 @@ static void bcache_exit(void) mutex_destroy(&bch_register_lock); } +/* Check and fixup module parameters */ +static void check_module_parameters(void) +{ + if (bch_cutoff_writeback_sync == 0) + bch_cutoff_writeback_sync = CUTOFF_WRITEBACK_SYNC; + else if (bch_cutoff_writeback_sync > CUTOFF_WRITEBACK_SYNC_MAX) { + pr_warn("set bch_cutoff_writeback_sync (%u) to max value %u", + bch_cutoff_writeback_sync, CUTOFF_WRITEBACK_SYNC_MAX); + bch_cutoff_writeback_sync = CUTOFF_WRITEBACK_SYNC_MAX; + } + + if (bch_cutoff_writeback == 0) + bch_cutoff_writeback = CUTOFF_WRITEBACK; + else if (bch_cutoff_writeback > CUTOFF_WRITEBACK_MAX) { + pr_warn("set bch_cutoff_writeback (%u) to max value %u", + bch_cutoff_writeback, CUTOFF_WRITEBACK_MAX); + bch_cutoff_writeback = CUTOFF_WRITEBACK_MAX; + } + + if (bch_cutoff_writeback > bch_cutoff_writeback_sync) { + pr_warn("set bch_cutoff_writeback (%u) to %u", + bch_cutoff_writeback, bch_cutoff_writeback_sync); + bch_cutoff_writeback = bch_cutoff_writeback_sync; + } +} + static int __init bcache_init(void) { static const struct attribute *files[] = { @@ -2428,6 +2457,8 @@ static int __init bcache_init(void) NULL }; + check_module_parameters(); + mutex_init(&bch_register_lock); init_waitqueue_head(&unregister_wait); register_reboot_notifier(&reboot); @@ -2464,9 +2495,18 @@ err: return -ENOMEM; } +/* + * Module hooks + */ module_exit(bcache_exit); module_init(bcache_init); +module_param(bch_cutoff_writeback, uint, 0); +MODULE_PARM_DESC(bch_cutoff_writeback, "threshold to cutoff writeback"); + +module_param(bch_cutoff_writeback_sync, uint, 0); +MODULE_PARM_DESC(bch_cutoff_writeback_sync, "hard threshold to cutoff writeback"); + MODULE_DESCRIPTION("Bcache: a Linux block layer cache"); MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>"); MODULE_LICENSE("GPL"); diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 621186b4240f..482b128b3e9d 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -88,6 +88,8 @@ read_attribute(writeback_keys_done); read_attribute(writeback_keys_failed); read_attribute(io_errors); read_attribute(congested); +read_attribute(cutoff_writeback); +read_attribute(cutoff_writeback_sync); rw_attribute(congested_read_threshold_us); rw_attribute(congested_write_threshold_us); @@ -686,6 +688,9 @@ SHOW(__bch_cache_set) sysfs_print(congested_write_threshold_us, c->congested_write_threshold_us); + sysfs_print(cutoff_writeback, bch_cutoff_writeback); + sysfs_print(cutoff_writeback_sync, bch_cutoff_writeback_sync); + sysfs_print(active_journal_entries, fifo_used(&c->journal.pin)); sysfs_printf(verify, "%i", c->verify); sysfs_printf(key_merging_disabled, "%i", c->key_merging_disabled); @@ -883,6 +888,8 @@ static struct attribute *bch_cache_set_internal_files[] = { &sysfs_copy_gc_enabled, &sysfs_gc_after_writeback, &sysfs_io_disable, + &sysfs_cutoff_writeback, + &sysfs_cutoff_writeback_sync, NULL }; KTYPE(bch_cache_set_internal); diff --git a/drivers/md/bcache/writeback.h b/drivers/md/bcache/writeback.h index ce63be98a39d..6a743d3bb338 100644 --- a/drivers/md/bcache/writeback.h +++ b/drivers/md/bcache/writeback.h @@ -5,6 +5,9 @@ #define CUTOFF_WRITEBACK 40 #define CUTOFF_WRITEBACK_SYNC 70 +#define CUTOFF_WRITEBACK_MAX 70 +#define CUTOFF_WRITEBACK_SYNC_MAX 90 + #define MAX_WRITEBACKS_IN_PASS 5 #define MAX_WRITESIZE_IN_PASS 5000 /* *512b */ @@ -55,6 +58,9 @@ static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc, } } +extern unsigned int bch_cutoff_writeback; +extern unsigned int bch_cutoff_writeback_sync; + static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, unsigned int cache_mode, bool would_skip) { @@ -62,7 +68,7 @@ static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, if (cache_mode != CACHE_MODE_WRITEBACK || test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) || - in_use > CUTOFF_WRITEBACK_SYNC) + in_use > bch_cutoff_writeback_sync) return false; if (dc->partial_stripes_expensive && @@ -75,7 +81,7 @@ static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, return (op_is_sync(bio->bi_opf) || bio->bi_opf & (REQ_META|REQ_PRIO) || - in_use <= CUTOFF_WRITEBACK); + in_use <= bch_cutoff_writeback); } static inline void bch_writeback_queue(struct cached_dev *dc) |