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ca5beb76c3
linux/drivers/md
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Bart Van Assche ca5beb76c3 dm mpath: micro-optimize the hot path relative to MPATHF_QUEUE_IF_NO_PATH 
Instead of checking MPATHF_QUEUE_IF_NO_PATH,
MPATHF_SAVED_QUEUE_IF_NO_PATH and the no_flush flag to decide whether
or not to push back a request (or bio) if there are no paths available,
only clear MPATHF_QUEUE_IF_NO_PATH in queue_if_no_path() if no_flush has
not been set.  The result is that only a single bit has to be tested in
the hot path to decide whether or not a request must be pushed back and
also that m->lock does not have to be taken in the hot path.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2017-04-27 17:08:45 -04:00
..
bcache sched/headers: Prepare to use <linux/rcuupdate.h> instead of <linux/rculist.h> in <linux/sched.h> 2017-03-02 08:42:38 +01:00
persistent-data dm block manager: remove an unused argument from dm_block_manager_create() 2017-04-27 17:08:41 -04:00
bitmap.c md: separate flags for superblock changes 2016-12-08 22:01:47 -08:00
bitmap.h
dm-bio-prison-v1.c dm bio prison v2: new interface for the bio prison 2017-03-07 11:30:16 -05:00
dm-bio-prison-v1.h dm bio prison v2: new interface for the bio prison 2017-03-07 11:30:16 -05:00
dm-bio-prison-v2.c dm bio prison v2: new interface for the bio prison 2017-03-07 11:30:16 -05:00
dm-bio-prison-v2.h dm bio prison v2: new interface for the bio prison 2017-03-07 11:30:16 -05:00
dm-bio-record.h
dm-bufio.c dm bufio: add sector start offset to dm-bufio interface 2017-03-07 13:28:33 -05:00
dm-bufio.h dm bufio: add sector start offset to dm-bufio interface 2017-03-07 13:28:33 -05:00
dm-builtin.c
dm-cache-background-tracker.c dm cache: significant rework to leverage dm-bio-prison-v2 2017-03-07 13:28:31 -05:00
dm-cache-background-tracker.h dm cache: significant rework to leverage dm-bio-prison-v2 2017-03-07 13:28:31 -05:00
dm-cache-block-types.h linux: drop __bitwise__ everywhere 2016-12-16 00:13:41 +02:00
dm-cache-metadata.c dm block manager: remove an unused argument from dm_block_manager_create() 2017-04-27 17:08:41 -04:00
dm-cache-metadata.h dm cache: significant rework to leverage dm-bio-prison-v2 2017-03-07 13:28:31 -05:00
dm-cache-policy-internal.h dm cache: significant rework to leverage dm-bio-prison-v2 2017-03-07 13:28:31 -05:00
dm-cache-policy-smq.c dm cache policy smq: make the cleaner policy write-back more aggressively 2017-03-31 11:41:05 -04:00
dm-cache-policy.c
dm-cache-policy.h dm cache: significant rework to leverage dm-bio-prison-v2 2017-03-07 13:28:31 -05:00
dm-cache-target.c dm cache: set/clear the cache core's dirty_bitset when loading mappings 2017-03-31 11:33:44 -04:00
dm-core.h dm: introduce enum dm_queue_mode to cleanup related code 2017-04-27 17:08:44 -04:00
dm-crypt.c dm crypt: replace custom implementation of hex2bin() 2017-04-27 12:08:31 -04:00
dm-delay.c dm: mark targets that pass integrity data 2017-04-24 12:04:32 -04:00
dm-era-target.c dm block manager: remove an unused argument from dm_block_manager_create() 2017-04-27 17:08:41 -04:00
dm-exception-store.c
dm-exception-store.h
dm-flakey.c dm flakey: introduce "error_writes" feature 2016-12-13 15:01:31 -05:00
dm-integrity.c dm integrity: use previously calculated log2 of sectors_per_block 2017-04-27 12:16:32 -04:00
dm-io.c dm io: use bvec iterator helpers to implement .get_page and .next_page 2016-11-21 09:51:57 -05:00
dm-ioctl.c dm: introduce enum dm_queue_mode to cleanup related code 2017-04-27 17:08:44 -04:00
dm-kcopyd.c
dm-linear.c dm: mark targets that pass integrity data 2017-04-24 12:04:32 -04:00
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log-writes.c
dm-log.c block,fs: use REQ_* flags directly 2016-11-01 09:43:26 -06:00
dm-mpath.c dm mpath: micro-optimize the hot path relative to MPATHF_QUEUE_IF_NO_PATH 2017-04-27 17:08:45 -04:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid1.c Merge branch 'for-4.10/block' of git://git.kernel.dk/linux-block 2016-12-13 10:19:16 -08:00
dm-raid.c dm raid: add raid4/5/6 journal write-back support via journal_mode option 2017-03-27 12:08:07 -04:00
dm-region-hash.c
dm-round-robin.c dm round robin: revert "use percpu 'repeat_count' and 'current_path'" 2017-02-17 00:54:09 -05:00
dm-rq.c dm rq: check blk_mq_register_dev() return value in dm_mq_init_request_queue() 2017-04-27 17:08:40 -04:00
dm-rq.h dm: always defer request allocation to the owner of the request_queue 2017-01-27 15:08:35 -07:00
dm-service-time.c
dm-snap-persistent.c block,fs: use REQ_* flags directly 2016-11-01 09:43:26 -06:00
dm-snap-transient.c
dm-snap.c
dm-stats.c dm stats: fix a leaked s->histogram_boundaries array 2017-02-16 14:17:07 -05:00
dm-stats.h
dm-stripe.c dm: mark targets that pass integrity data 2017-04-24 12:04:32 -04:00
dm-switch.c
dm-sysfs.c
dm-table.c dm: introduce enum dm_queue_mode to cleanup related code 2017-04-27 17:08:44 -04:00
dm-target.c dm: always defer request allocation to the owner of the request_queue 2017-01-27 15:08:35 -07:00
dm-thin-metadata.c dm block manager: remove an unused argument from dm_block_manager_create() 2017-04-27 17:08:41 -04:00
dm-thin-metadata.h
dm-thin.c dm thin: fix a memory leak when passing discard bio down 2017-04-24 14:58:10 -04:00
dm-uevent.c
dm-uevent.h
dm-verity-fec.c dm verity: switch to using asynchronous hash crypto API 2017-04-24 15:37:04 -04:00
dm-verity-fec.h
dm-verity-target.c dm verity: switch to using asynchronous hash crypto API 2017-04-24 15:37:04 -04:00
dm-verity.h dm verity: switch to using asynchronous hash crypto API 2017-04-24 15:37:04 -04:00
dm-zero.c
dm.c dm: introduce enum dm_queue_mode to cleanup related code 2017-04-27 17:08:44 -04:00
dm.h dm: introduce enum dm_queue_mode to cleanup related code 2017-04-27 17:08:44 -04:00
faulty.c md: fast clone bio in bio_clone_mddev() 2017-02-15 11:24:54 -08:00
Kconfig dm raid: select the Kconfig option CONFIG_MD_RAID0 2017-03-30 11:17:08 -04:00
linear.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-02-24 14:42:19 -08:00
linear.h md linear: fix a race between linear_add() and linear_congested() 2017-02-13 09:17:50 -08:00
Makefile dm: add integrity target 2017-03-24 15:49:07 -04:00
md-cluster.c
md-cluster.h
md.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
md.h md: fast clone bio in bio_clone_mddev() 2017-02-15 11:24:54 -08:00
multipath.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-02-24 14:42:19 -08:00
multipath.h
raid0.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-02-24 14:42:19 -08:00
raid0.h
raid1.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
raid1.h RAID1: avoid unnecessary spin locks in I/O barrier code 2017-02-19 22:04:25 -08:00
raid5-cache.c md: add raid4/5/6 journal mode switching API 2017-03-27 11:13:47 -04:00
raid5.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
raid5.h md: add raid4/5/6 journal mode switching API 2017-03-27 11:13:47 -04:00
raid10.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-02-24 14:42:19 -08:00
raid10.h md/raid10: add failfast handling for reads. 2016-11-22 09:14:28 -08:00