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4cc1b4cffd
linux/drivers/md
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Mikulas Patocka 4cc1b4cffd dm kcopyd: remove superfluous page allocation spinlock 
Remove the spinlock protecting the pages allocation.  The spinlock is only
taken on initialization or from single-threaded workqueue.  Therefore, the
spinlock is useless.

The spinlock is taken in kcopyd_get_pages and kcopyd_put_pages.

kcopyd_get_pages is only called from run_pages_job, which is only
called from process_jobs called from do_work.

kcopyd_put_pages is called from client_alloc_pages (which is initialization
function) or from run_complete_job. run_complete_job is only called from
process_jobs called from do_work.

Another spinlock, kc->job_lock is taken each time someone pushes or pops
some work for the worker thread.  Once we take kc->job_lock, we
guarantee that any written memory is visible to the other CPUs.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-05-29 13:03:02 +01:00
..
bitmap.c md/bitmap: fix saving of events_cleared and other state. 2011-05-11 14:26:30 +10:00
bitmap.h Fix common misspellings 2011-03-31 11:26:23 -03:00
dm-bio-record.h dm: preserve bi_io_vec when resubmitting bios 2009-04-02 19:55:23 +01:00
dm-crypt.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm 2011-03-25 20:51:44 -07:00
dm-delay.c dm: convert workqueues to alloc_ordered 2011-01-13 19:59:57 +00:00
dm-exception-store.c dm snapshot: test chunk size against both origin and snapshot 2010-08-12 04:13:51 +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: add flakey target 2011-03-24 13:54:24 +00:00
dm-io.c block: kill off REQ_UNPLUG 2011-03-10 08:52:27 +01:00
dm-ioctl.c dm ioctl: add flag to wipe buffers for secure data 2011-03-24 13:54:30 +00:00
dm-kcopyd.c dm kcopyd: remove superfluous page allocation spinlock 2011-05-29 13:03:02 +01:00
dm-linear.c dm: use dm_target_offset macro 2010-08-12 04:14:11 +01:00
dm-log-userspace-base.c dm log userspace: add version number to comms 2011-01-13 19:59:52 +00:00
dm-log-userspace-transfer.c netlink: kill eff_cap from struct netlink_skb_parms 2011-03-03 13:32:07 -08:00
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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm 2011-03-25 20:51:44 -07:00
dm-mpath.c dm mpath: do not fail paths after integrity errors 2011-05-29 13:02:55 +01:00
dm-mpath.h
dm-path-selector.c dm: path selector use module refcount directly 2009-04-02 19:55:27 +01:00
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 mpath: add queue length load balancer 2009-06-22 10:12:27 +01:00
dm-raid1.c block: remove per-queue plugging 2011-03-10 08:52:07 +01:00
dm-raid.c md/dm - remove remains of plug_fn callback. 2011-04-18 18:25:41 +10:00
dm-region-hash.c Fix common misspellings 2011-03-31 11:26:23 -03:00
dm-round-robin.c dm mpath: add start_io and nr_bytes to path selectors 2009-06-22 10:12:27 +01:00
dm-service-time.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
dm-snap-persistent.c dm snapshot: persistent make metadata_wq multithreaded 2011-01-13 19:59:59 +00:00
dm-snap-transient.c dm snapshot: move cow ref from exception store to snap core 2009-12-10 23:52:12 +00:00
dm-snap.c dm: fix opening log and cow devices for read only tables 2011-03-24 13:52:14 +00:00
dm-stripe.c dm stripe: implement merge method 2011-03-24 13:54:35 +00:00
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 table: reject devices without request fns 2011-05-29 13:02:52 +01:00
dm-target.c dm: error return error for discards 2010-08-12 04:14:14 +01:00
dm-uevent.c dm table: remove dm_get from dm_table_get_md 2010-03-06 02:29:52 +00:00
dm-uevent.h
dm-zero.c dm: zero silently drop discards 2010-08-12 04:14:12 +01:00
dm.c block: fix non-atomic access to genhd inflight structures 2011-03-22 08:35:35 +01:00
dm.h block: Require subsystems to explicitly allocate bio_set integrity mempool 2011-03-17 11:11:05 +01:00
faulty.c Fix common misspellings 2011-03-31 11:26:23 -03:00
Kconfig dm: add flakey target 2011-03-24 13:54:24 +00:00
linear.c block: Require subsystems to explicitly allocate bio_set integrity mempool 2011-03-17 11:11:05 +01:00
linear.h md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
Makefile dm: add flakey target 2011-03-24 13:54:24 +00:00
md.c md: allow resync_start to be set while an array is active. 2011-05-11 15:52:21 +10:00
md.h md: provide generic support for handling unplug callbacks. 2011-04-18 18:25:42 +10:00
multipath.c md: make error_handler functions more uniform and correct. 2011-05-11 14:38:44 +10:00
multipath.h md/multipath: discard ->working_disks in favour of ->degraded 2011-05-11 14:38:02 +10:00
raid0.c block: Require subsystems to explicitly allocate bio_set integrity mempool 2011-03-17 11:11:05 +01:00
raid0.h md: fix handling of array level takeover that re-arranges devices. 2010-06-24 13:33:24 +10:00
raid1.c md: allow resync_start to be set while an array is active. 2011-05-11 15:52:21 +10:00
raid1.h md/raid1: improve handling of pages allocated for write-behind. 2011-05-11 14:51:19 +10:00
raid5.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-05-23 09:12:26 -07:00
raid5.h md - remove old plugging code. 2011-04-18 18:25:42 +10:00
raid10.c md/raid10: reformat some loops with less indenting. 2011-05-11 14:54:41 +10:00
raid10.h Fix common misspellings 2011-03-31 11:26:23 -03:00