Mike Snitzer ed8b752bcc dm table: set flush capability based on underlying devices ...

DM has always advertised both REQ_FLUSH and REQ_FUA flush capabilities
regardless of whether or not a given DM device's underlying devices
also advertised a need for them.

Block's flush-merge changes from 2.6.39 have proven to be more costly
for DM devices.  Performance regressions have been reported even when
DM's underlying devices do not advertise that they have a write cache.

Fix the performance regressions by configuring a DM device's flushing
capabilities based on those of the underlying devices' capabilities.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

2011-08-02 12:32:08 +01:00

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bitmap.c

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bitmap.h

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dm-bio-record.h

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dm-crypt.c

dm crypt: optionally support discard requests

2011-08-02 12:32:08 +01:00

dm-delay.c

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dm-exception-store.c

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dm-exception-store.h

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dm-flakey.c

dm flakey: add corrupt_bio_byte feature

2011-08-02 12:32:06 +01:00

dm-io.c

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dm-ioctl.c

dm ioctl: forbid multiple device specifiers

2011-08-02 12:32:06 +01:00

dm-kcopyd.c

dm snapshot: skip reading origin when overwriting complete chunk

2011-08-02 12:32:04 +01:00

dm-linear.c

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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

dm: use vzalloc

2011-08-02 12:32:02 +01:00

dm-mpath.c

dm table: share target argument parsing functions

2011-08-02 12:32:04 +01:00

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

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dm-raid.c

dm raid: add md raid1 support

2011-08-02 12:32:07 +01:00

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

dm snapshot: style cleanups

2011-08-02 12:32:03 +01:00

dm-snap-transient.c

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dm-snap.c

dm snapshot: skip reading origin when overwriting complete chunk

2011-08-02 12:32:04 +01:00

dm-stripe.c

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dm-sysfs.c

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dm-table.c

dm table: set flush capability based on underlying devices

2011-08-02 12:32:08 +01:00

dm-target.c

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dm-uevent.c

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dm-uevent.h

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dm-zero.c

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dm.c

dm table: set flush capability based on underlying devices

2011-08-02 12:32:08 +01:00

dm.h

dm: ignore merge_bvec for snapshots when safe

2011-08-02 12:32:04 +01:00

faulty.c

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Kconfig

dm raid: support metadata devices

2011-08-02 12:32:07 +01:00

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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