Mikulas Patocka df5d2e9089 dm kcopyd: introduce configurable throttling ...

This patch allows the administrator to reduce the rate at which kcopyd
issues I/O.

Each module that uses kcopyd acquires a throttle parameter that can be
set in /sys/module/*/parameters.

We maintain a history of kcopyd usage by each module in the variables
io_period and total_period in struct dm_kcopyd_throttle. The actual
kcopyd activity is calculated as a percentage of time equal to
"(100 * io_period / total_period)".  This is compared with the user-defined
throttle percentage threshold and if it is exceeded, we sleep.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

2013-03-01 22:45:49 +00:00

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persistent-data

dm persistent data: set some btree fn parms const

2013-03-01 22:45:47 +00:00

bitmap.c

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bitmap.h

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dm-bio-prison.c

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dm-bio-prison.h

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dm-bio-record.h

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dm-bufio.c

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dm-bufio.h

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dm-crypt.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-delay.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-exception-store.c

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dm-exception-store.h

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dm-flakey.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-io.c

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dm-ioctl.c

dm ioctl: allow message to return data

2013-03-01 22:45:49 +00:00

dm-kcopyd.c

dm kcopyd: introduce configurable throttling

2013-03-01 22:45:49 +00:00

dm-linear.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-log-userspace-base.c

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dm-log-userspace-transfer.c

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dm-log-userspace-transfer.h

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dm-log.c

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dm-mpath.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-mpath.h

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dm-path-selector.c

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dm-path-selector.h

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dm-queue-length.c

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dm-raid1.c

dm kcopyd: introduce configurable throttling

2013-03-01 22:45:49 +00:00

dm-raid.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-region-hash.c

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dm-round-robin.c

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dm-service-time.c

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dm-snap-persistent.c

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dm-snap-transient.c

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dm-snap.c

dm kcopyd: introduce configurable throttling

2013-03-01 22:45:49 +00:00

dm-stripe.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-sysfs.c

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dm-table.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-target.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm-thin-metadata.c

dm persistent data: set some btree fn parms const

2013-03-01 22:45:47 +00:00

dm-thin-metadata.h

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dm-thin.c

dm kcopyd: introduce configurable throttling

2013-03-01 22:45:49 +00:00

dm-uevent.c

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dm-uevent.h

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dm-verity.c

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dm-zero.c

dm: rename request variables to bios

2013-03-01 22:45:47 +00:00

dm.c

dm: merge io_pool and tio_pool

2013-03-01 22:45:48 +00:00

dm.h

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faulty.c

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Kconfig

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linear.c

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linear.h

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Makefile

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md.c

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md.h

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multipath.c

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multipath.h

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raid0.c

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raid0.h

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raid1.c

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raid1.h

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raid5.c

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raid5.h

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raid10.c

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raid10.h

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