throttle: add the name of the ThrottleGroup to BlockDeviceInfo

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 172df91f09c69c6f0440a69

throttle: add the name of the ThrottleGroup to BlockDeviceInfo

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 172df91f09c69c6f0440a697bbd1b3f95b077ee4.1433779731.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

throttle: Add throttle group support

The throttle group support use a cooperative round robin scheduling
algorithm.

The principles of the algorithm are simple:
- Each BDS of the group is used as a

throttle: Add throttle group support

The throttle group support use a cooperative round robin scheduling
algorithm.

The principles of the algorithm are simple:
- Each BDS of the group is used as a token in a circular way.
- The active BDS computes if a wait must be done and arms the right
timer.
- If a wait must be done the token timer will be armed so the token
will become the next active BDS.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: f0082a86f3ac01c46170f7eafe2101a92e8fde39.1433779731.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

qmp/hmp: add rocker device support

Add QMP/HMP support for rocker devices. This is mostly for debugging purposes
to see inside the device's tables and port configurations. Some examples:

(qemu) i

qmp/hmp: add rocker device support

Add QMP/HMP support for rocker devices. This is mostly for debugging purposes
to see inside the device's tables and port configurations. Some examples:

(qemu) info rocker sw1
name: sw1
id: 0x0000013512005452
ports: 4

(qemu) info rocker-ports sw1
ena/ speed/ auto
port link duplex neg?
sw1.1 up 10G FD No
sw1.2 up 10G FD No
sw1.3 !ena 10G FD No
sw1.4 !ena 10G FD No

(qemu) info rocker-of-dpa-flows sw1
prio tbl hits key(mask) --> actions
2 60 pport 1 vlan 1 LLDP src 00:02:00:00:02:00 dst 01:80:c2:00:00:0e
2 60 pport 1 vlan 1 ARP src 00:02:00:00:02:00 dst 00:02:00:00:03:00
2 60 pport 2 vlan 2 IPv6 src 00:02:00:00:03:00 dst 33:33:ff:00:00:02 proto 58
3 50 vlan 2 dst 33:33:ff:00:00:02 --> write group 0x32000001 goto tbl 60
2 60 pport 2 vlan 2 IPv6 src 00:02:00:00:03:00 dst 33:33:ff:00:03:00 proto 58
3 50 1 vlan 2 dst 33:33:ff:00:03:00 --> write group 0x32000001 goto tbl 60
2 60 pport 2 vlan 2 ARP src 00:02:00:00:03:00 dst 00:02:00:00:02:00
3 50 2 vlan 2 dst 00:02:00:00:02:00 --> write group 0x02000001 goto tbl 60
2 60 1 pport 2 vlan 2 IP src 00:02:00:00:03:00 dst 00:02:00:00:02:00 proto 1
3 50 2 vlan 1 dst 00:02:00:00:03:00 --> write group 0x01000002 goto tbl 60
2 60 1 pport 1 vlan 1 IP src 00:02:00:00:02:00 dst 00:02:00:00:03:00 proto 1
2 60 pport 1 vlan 1 IPv6 src 00:02:00:00:02:00 dst 33:33:ff:00:00:01 proto 58
3 50 vlan 1 dst 33:33:ff:00:00:01 --> write group 0x31000000 goto tbl 60
2 60 pport 1 vlan 1 IPv6 src 00:02:00:00:02:00 dst 33:33:ff:00:02:00 proto 58
3 50 1 vlan 1 dst 33:33:ff:00:02:00 --> write group 0x31000000 goto tbl 60
1 60 173 pport 2 vlan 2 LLDP src <any> dst 01:80:c2:00:00:0e --> write group 0x02000000
1 60 6 pport 2 vlan 2 IPv6 src <any> dst <any> --> write group 0x02000000
1 60 174 pport 1 vlan 1 LLDP src <any> dst 01:80:c2:00:00:0e --> write group 0x01000000
1 60 174 pport 2 vlan 2 IP src <any> dst <any> --> write group 0x02000000
1 60 6 pport 1 vlan 1 IPv6 src <any> dst <any> --> write group 0x01000000
1 60 181 pport 2 vlan 2 ARP src <any> dst <any> --> write group 0x02000000
1 10 715 pport 2 --> apply new vlan 2 goto tbl 20
1 60 177 pport 1 vlan 1 ARP src <any> dst <any> --> write group 0x01000000
1 60 174 pport 1 vlan 1 IP src <any> dst <any> --> write group 0x01000000
1 10 717 pport 1 --> apply new vlan 1 goto tbl 20
1 0 1432 pport 0(0xffff) --> goto tbl 10

(qemu) info rocker-of-dpa-groups sw1
id (decode) --> buckets
0x32000001 (type L2 multicast vlan 2 index 1) --> groups [0x02000001,0x02000000]
0x02000001 (type L2 interface vlan 2 pport 1) --> pop vlan out pport 1
0x01000002 (type L2 interface vlan 1 pport 2) --> pop vlan out pport 2
0x02000000 (type L2 interface vlan 2 pport 0) --> pop vlan out pport 0
0x01000000 (type L2 interface vlan 1 pport 0) --> pop vlan out pport 0
0x31000000 (type L2 multicast vlan 1 index 0) --> groups [0x01000002,0x01000000]

[Added "query-" prefixes to rocker.json commands as suggested by Eric
Blake <eblake@redhat.com>.
--Stefan]

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Message-id: 1433985681-56138-5-git-send-email-sfeldma@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

qapi: add dirty bitmap status

Bitmaps can be in a handful of different states with potentially
more to come as we tool around with migration and persistence patches.

Management applications may nee

qapi: add dirty bitmap status

Bitmaps can be in a handful of different states with potentially
more to come as we tool around with migration and persistence patches.

Management applications may need to know why certain bitmaps are
unavailable for various commands, e.g. busy in another operation,
busy being migrated, etc.

Right now, all we offer is BlockDirtyInfo's boolean member 'frozen'.
Instead of adding more booleans, replace it by an enumeration member
'status' with values 'active' and 'frozen'. Then add new value
'disabled'.

Incompatible change. Fine because the changed part hasn't been
released so far.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

docs: update BLOCK_IMAGE_CORRUPTED documentation

Label the "size" and "offset" fields in BLOCK_IMAGE_CORRUPTED as
optional, and clarify that the latter refers to the host's offset into
the image.

S

docs: update BLOCK_IMAGE_CORRUPTED documentation

Label the "size" and "offset" fields in BLOCK_IMAGE_CORRUPTED as
optional, and clarify that the latter refers to the host's offset into
the image.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

show more ...

qapi: Drop inline nested struct in query-version

A future patch will be using a 'name':{dictionary} entry in the
QAPI schema to specify a default value for an optional argument
(see previous commit

qapi: Drop inline nested struct in query-version

A future patch will be using a 'name':{dictionary} entry in the
QAPI schema to specify a default value for an optional argument
(see previous commit message for more details why); but existing
use of inline nested structs conflicts with that goal. This patch
fixes one of only two commands relying on nested types, by
breaking the nesting into an explicit type; it means that the
type is now boxed instead of unboxed in C code, but the QMP wire
format is unaffected by this change.

Prefer the safer g_new0() while making the conversion.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

qapi: Use 'struct' instead of 'type' in schema

Referring to "type" as both a meta-type (built-in, enum, union,
alternate, or struct) and a specific type (the name that the
schema uses for declaring

qapi: Use 'struct' instead of 'type' in schema

Referring to "type" as both a meta-type (built-in, enum, union,
alternate, or struct) and a specific type (the name that the
schema uses for declaring structs) is confusing. Do the bulk of
the conversion to "struct" in qapi schema, with a fairly
mechanical:

for f in `find -name '*.json'; do sed -i "s/'type'/'struct'/"; done

followed by manually filtering out the places where we have a
'type' embedded in 'data'. Then tweak a couple of tests whose
output changes slightly due to longer lines.

I also verified that the generated files for QMP and QGA (such
as qmp-commands.h) are the same before and after, as assurance
that I didn't leave in any accidental member name changes.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

qapi: Use 'alternate' to replace anonymous union

Previous patches have led up to the point where I create the
new meta-type "'alternate':'Foo'". See the previous patches
for documentation; I intent

qapi: Use 'alternate' to replace anonymous union

Previous patches have led up to the point where I create the
new meta-type "'alternate':'Foo'". See the previous patches
for documentation; I intentionally split as much work into
earlier patches to minimize the size of this patch, but a lot
of it is churn due to testsuite fallout after updating to the
new type.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

qmp: Add dirty bitmap status field in query-block

Add the "frozen" status booleans, to inform clients
when a bitmap is occupied doing a task.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-b

qmp: Add dirty bitmap status field in query-block

Add the "frozen" status booleans, to inform clients
when a bitmap is occupied doing a task.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1429314609-29776-13-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

qmp: add block-dirty-bitmap-clear

Add bdrv_clear_dirty_bitmap and a matching QMP command,
qmp_block_dirty_bitmap_clear that enables a user to reset
the bitmap attached to a drive.

This allows us to

qmp: add block-dirty-bitmap-clear

Add bdrv_clear_dirty_bitmap and a matching QMP command,
qmp_block_dirty_bitmap_clear that enables a user to reset
the bitmap attached to a drive.

This allows us to reset a bitmap in the event of a full
drive backup.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1429314609-29776-12-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

qmp: Add support of "dirty-bitmap" sync mode for drive-backup

For "dirty-bitmap" sync mode, the block job will iterate through the
given dirty bitmap to decide if a sector needs backup (backup all t

qmp: Add support of "dirty-bitmap" sync mode for drive-backup

For "dirty-bitmap" sync mode, the block job will iterate through the
given dirty bitmap to decide if a sector needs backup (backup all the
dirty clusters and skip clean ones), just as allocation conditions of
"top" sync mode.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1429314609-29776-11-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

block: Add bitmap successors

A bitmap successor is an anonymous BdrvDirtyBitmap that is intended to
be created just prior to a sensitive operation (e.g. Incremental Backup)
that can either succeed o

block: Add bitmap successors

A bitmap successor is an anonymous BdrvDirtyBitmap that is intended to
be created just prior to a sensitive operation (e.g. Incremental Backup)
that can either succeed or fail, but during the course of which we still
want a bitmap tracking writes.

On creating a successor, we "freeze" the parent bitmap which prevents
its deletion, enabling, anonymization, or creating a bitmap with the
same name.

On success, the parent bitmap can "abdicate" responsibility to the
successor, which will inherit its name. The successor will have been
tracking writes during the course of the backup operation. The parent
will be safely deleted.

On failure, we can "reclaim" the successor from the parent, unifying
them such that the resulting bitmap describes all writes occurring since
the last successful backup, for instance. Reclamation will thaw the
parent, but not explicitly re-enable it.

BdrvDirtyBitmap operations that target a single bitmap are protected
by assertions that the bitmap is not frozen and/or disabled.

BdrvDirtyBitmap operations that target a group of bitmaps, such as
bdrv_{set,reset}_dirty will ignore frozen/disabled drives with a
conditional instead.

Internal functions that enable/disable dirty bitmaps have assertions
added to them to prevent modifying frozen bitmaps.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1429314609-29776-10-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

qmp: Add block-dirty-bitmap-add and block-dirty-bitmap-remove

The new command pair is added to manage a user created dirty bitmap. The
dirty bitmap's name is mandatory and must be unique for the sam

qmp: Add block-dirty-bitmap-add and block-dirty-bitmap-remove

The new command pair is added to manage a user created dirty bitmap. The
dirty bitmap's name is mandatory and must be unique for the same device,
but different devices can have bitmaps with the same names.

The granularity is an optional field. If it is not specified, we will
choose a default granularity based on the cluster size if available,
clamped to between 4K and 64K to mirror how the 'mirror' code was
already choosing granularity. If we do not have cluster size info
available, we choose 64K. This code has been factored out into a helper
shared with block/mirror.

This patch also introduces the 'block_dirty_bitmap_lookup' helper,
which takes a device name and a dirty bitmap name and validates the
lookup, returning NULL and setting errp if there is a problem with
either field. This helper will be re-used in future patches in this
series.

The types added to block-core.json will be re-used in future patches
in this series, see:
'qapi: Add transaction support to block-dirty-bitmap-{add, enable, disable}'

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1429314609-29776-5-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

qmp: Ensure consistent granularity type

We treat this field with a variety of different types everywhere
in the code. Now it's just uint32_t.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by

qmp: Ensure consistent granularity type

We treat this field with a variety of different types everywhere
in the code. Now it's just uint32_t.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1429314609-29776-4-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

qapi: Add optional field "name" to block dirty bitmap

This field will be set for user created dirty bitmap. Also pass in an
error pointer to bdrv_create_dirty_bitmap, so when a name is already
taken

qapi: Add optional field "name" to block dirty bitmap

This field will be set for user created dirty bitmap. Also pass in an
error pointer to bdrv_create_dirty_bitmap, so when a name is already
taken on this BDS, it can report an error message. This is not global
check, two BDSes can have dirty bitmap with a common name.

Implemented bdrv_find_dirty_bitmap to find a dirty bitmap by name, will
be used later when other QMP commands want to reference dirty bitmap by
name.

Add bdrv_dirty_bitmap_make_anon. This unsets the name of dirty bitmap.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1429314609-29776-3-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

block: add 'node-name' field to BLOCK_IMAGE_CORRUPTED

Since this event can occur in nodes that cannot have a device name
associated, include also a field with the node name.

Signed-off-by: Alberto

block: add 'node-name' field to BLOCK_IMAGE_CORRUPTED

Since this event can occur in nodes that cannot have a device name
associated, include also a field with the node name.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 147cec5b3594f4bec0cb41c98afe5fcbfb67567c.1428485266.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

block/null: Latency simulation by adding new option "latency-ns"

Aio context switch should just work because the requests will be
drained, so the scheduled timer(s) on the old context will be freed.

block/null: Latency simulation by adding new option "latency-ns"

Aio context switch should just work because the requests will be
drained, so the scheduled timer(s) on the old context will be freed.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427852740-24315-2-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

qmp-event: add event notification for memory hot unplug error

When memory hot unplug fails, this patch adds support to send
QMP event to notify mgmt about this failure.

Reviewed-by: Igor Mammedov <

qmp-event: add event notification for memory hot unplug error

When memory hot unplug fails, this patch adds support to send
QMP event to notify mgmt about this failure.

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

show more ...

block: Document blockdev-add's immaturity

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1426858337-21423-1-git-send-email-armbru@redhat

block: Document blockdev-add's immaturity

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1426858337-21423-1-git-send-email-armbru@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

block: Fix blockdev-backup not to use funky error class

Error classes are a leftover from the days of "rich" error objects.
New code should always use ERROR_CLASS_GENERIC_ERROR. Commit
b7b9d39..7c6

block: Fix blockdev-backup not to use funky error class

Error classes are a leftover from the days of "rich" error objects.
New code should always use ERROR_CLASS_GENERIC_ERROR. Commit
b7b9d39..7c6a4ab added uses of ERROR_CLASS_DEVICE_NOT_FOUND. Replace
them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

raw-posix: Deprecate host floppy passthrough

Raise your hand if you have a physical floppy drive in a computer
you've powered on in 2015. Okay, I see we got a few weirdos in the
audience. That's o

raw-posix: Deprecate host floppy passthrough

Raise your hand if you have a physical floppy drive in a computer
you've powered on in 2015. Okay, I see we got a few weirdos in the
audience. That's okay, weirdos are welcome here.

Kidding aside, media change detection doesn't fully work, isn't going
to be fixed, and floppy passthrough just isn't earning its keep
anymore.

Deprecate block driver host_floppy now, so we can drop it after a
grace period.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

block: Fix block-set-write-threshold not to use funky error class

Error classes are a leftover from the days of "rich" error objects.
New code should always use ERROR_CLASS_GENERIC_ERROR. Commit e2

block: Fix block-set-write-threshold not to use funky error class

Error classes are a leftover from the days of "rich" error objects.
New code should always use ERROR_CLASS_GENERIC_ERROR. Commit e246211
added a use of ERROR_CLASS_DEVICE_NOT_FOUND. Replace it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

qcow2: Add refcount_bits to format-specific info

Add the bit width of every refcount entry to the format-specific
information.

In contrast to lazy_refcounts and the corrupt flag, this should be
alw

qcow2: Add refcount_bits to format-specific info

Add the bit width of every refcount entry to the format-specific
information.

In contrast to lazy_refcounts and the corrupt flag, this should be
always emitted, even for compat=0.10 although it does not support any
refcount width other than 16 bits. This is because if a boolean is
optional, one normally assumes it to be false when omitted; but if an
integer is not specified, it is rather difficult to guess its value.

This new field breaks some test outputs, fix them.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

block: add event when disk usage exceeds threshold

Managing applications, like oVirt (http://www.ovirt.org), make extensive
use of thin-provisioned disk images.
To let the guest run smoothly and be

block: add event when disk usage exceeds threshold

Managing applications, like oVirt (http://www.ovirt.org), make extensive
use of thin-provisioned disk images.
To let the guest run smoothly and be not unnecessarily paused, oVirt sets
a disk usage threshold (so called 'high water mark') based on the occupation
of the device, and automatically extends the image once the threshold
is reached or exceeded.

In order to detect the crossing of the threshold, oVirt has no choice but
aggressively polling the QEMU monitor using the query-blockstats command.
This lead to unnecessary system load, and is made even worse under scale:
deployments with hundreds of VMs are no longer rare.

To fix this, this patch adds:
* A new monitor command `block-set-write-threshold', to set a mark for
a given block device.
* A new event `BLOCK_WRITE_THRESHOLD', to report if a block device
usage exceeds the threshold.
* A new `write_threshold' field into the `BlockDeviceInfo' structure,
to report the configured threshold.

This will allow the managing application to use smarter and more
efficient monitoring, greatly reducing the need of polling.

[Updated qemu-iotests 067 output to add the new 'write_threshold'
property. --Stefan]
[Changed g_assert_false() to !g_assert() to fix the build on older glib
versions. --Kevin]

Signed-off-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1421068273-692-1-git-send-email-fromani@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...

block: add accounting for merged requests

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <k

block: add accounting for merged requests

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

show more ...