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0021b7bc04
linux/drivers/md
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NeilBrown 0021b7bc04 md: remove plug_cnt feature of plugging. 
This seemed like a good idea at the time, but after further thought I
cannot see it making a difference other than very occasionally and
testing to try to exercise the case it is most likely to help did not
show any performance difference by removing it.

So remove the counting of active plugs and allow 'pending writes' to
be activated at any time, not just when no plugs are active.

This is only relevant when there is a write-intent bitmap, and the
updating of the bitmap will likely introduce enough delay that
the single-threading of bitmap updates will be enough to collect large
numbers of updates together.

Removing this will make it easier to centralise the unplug code, and
will clear the other for other unplug enhancements which have a
measurable effect.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2012-07-31 09:08:14 +02:00
..
persistent-data dm persistent data: fix allocation failure in space map checker init 2012-07-03 12:55:37 +01:00
bitmap.c md/bitmap: record the space available for the bitmap in the superblock. 2012-05-22 13:55:34 +10:00
bitmap.h md/bitmap: record the space available for the bitmap in the superblock. 2012-05-22 13:55:34 +10:00
dm-bio-record.h
dm-bufio.c dm bufio: prefetch 2012-03-28 18:41:29 +01:00
dm-bufio.h dm bufio: prefetch 2012-03-28 18:41:29 +01:00
dm-crypt.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-delay.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-exception-store.c dm exception store: fix init error path 2012-03-28 18:41:22 +01:00
dm-exception-store.h dm snapshot: test chunk size against both origin and snapshot 2010-08-12 04:13:51 +01:00
dm-flakey.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-io.c dm io: fix discard support 2012-03-07 19:09:37 +00:00
dm-ioctl.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-kcopyd.c dm kcopyd: add dm_kcopyd_zero to zero an area 2011-10-31 20:18:58 +00:00
dm-linear.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-log-userspace-base.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
dm-log-userspace-transfer.c connector/userns: replace netlink uses of cap_raised() with capable() 2012-05-10 23:21:39 -04:00
dm-log-userspace-transfer.h dm log: userspace add luid to distinguish between concurrent log instances 2009-09-04 20:40:34 +01:00
dm-log.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-mpath.c dm mpath: allow ioctls to trigger pg init 2012-06-03 00:29:58 +01:00
dm-mpath.h
dm-path-selector.c md: Add module.h to all files using it implicitly 2011-10-31 19:31:18 -04:00
dm-path-selector.h dm mpath: add start_io and nr_bytes to path selectors 2009-06-22 10:12:27 +01:00
dm-queue-length.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-raid1.c dm raid1: set discard_zeroes_data_unsupported 2012-07-20 14:25:07 +01:00
dm-raid.c DM RAID: Use md_error() in place of simply setting Faulty bit 2012-05-22 13:55:31 +10:00
dm-region-hash.c dm raid1: fix crash with mirror recovery and discard 2012-07-20 14:25:03 +01:00
dm-round-robin.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-service-time.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-snap-persistent.c md: Add in export.h for files using EXPORT_SYMBOL 2011-10-31 19:31:19 -04:00
dm-snap-transient.c md: Add in export.h for files using EXPORT_SYMBOL 2011-10-31 19:31:19 -04:00
dm-snap.c dm snapshot: skip reading origin when overwriting complete chunk 2011-08-02 12:32:04 +01:00
dm-stripe.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-sysfs.c Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
dm-table.c dm: reject trailing characters in sccanf input 2012-03-28 18:41:26 +01:00
dm-target.c dm: error return error for discards 2010-08-12 04:14:14 +01:00
dm-thin-metadata.c dm thin: provide userspace access to pool metadata 2012-06-03 00:30:01 +01:00
dm-thin-metadata.h dm thin: provide userspace access to pool metadata 2012-06-03 00:30:01 +01:00
dm-thin.c dm thin: do not send discards to shared blocks 2012-07-20 14:25:05 +01:00
dm-uevent.c md: Add in export.h for files using EXPORT_SYMBOL 2011-10-31 19:31:19 -04:00
dm-uevent.h
dm-verity.c dm: add verity target 2012-03-28 18:43:38 +01:00
dm-zero.c dm: zero silently drop discards 2010-08-12 04:14:12 +01:00
dm.c dm: clear bi_end_io on remapping failure 2012-03-28 18:41:25 +01:00
dm.h dm table: add immutable feature 2011-10-31 20:19:04 +00:00
faulty.c md: tidy up rdev_for_each usage. 2012-03-19 12:46:39 +11:00
Kconfig dm: add verity target 2012-03-28 18:43:38 +01:00
linear.c md/linear: If md_integrity_register() fails, linear_run() must free the mem. 2012-04-02 09:48:37 +10:00
linear.h md/linear: typedef removal: linear_conf_t -> struct linear_conf 2011-10-11 16:48:54 +11:00
Makefile dm: add verity target 2012-03-28 18:43:38 +01:00
md.c md: remove plug_cnt feature of plugging. 2012-07-31 09:08:14 +02:00
md.h md: remove plug_cnt feature of plugging. 2012-07-31 09:08:14 +02:00
multipath.c md: make 'name' arg to md_register_thread non-optional. 2012-07-03 15:56:52 +10:00
multipath.h md/multipath: typedef removal: multipath_conf_t -> struct mpconf 2011-10-11 16:48:57 +11:00
raid0.c md: Avoid OOPS when reshaping raid1 to raid0 2012-04-03 15:37:26 +10:00
raid0.h md: add proper merge_bvec handling to RAID0 and Linear. 2012-03-19 12:46:39 +11:00
raid1.c md: remove plug_cnt feature of plugging. 2012-07-31 09:08:14 +02:00
raid1.h md/raid1: Allocate spare to store replacement devices and their bios. 2011-12-23 10:17:56 +11:00
raid5.c md: remove plug_cnt feature of plugging. 2012-07-31 09:08:14 +02:00
raid5.h raid5: support sync request 2012-05-22 13:55:05 +10:00
raid10.c md: remove plug_cnt feature of plugging. 2012-07-31 09:08:14 +02:00
raid10.h md/raid10: add reshape support 2012-05-22 13:53:47 +10:00