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  1. 04 8月, 2017 1 次提交
  3. 01 8月, 2017 5 次提交
  5. 27 3月, 2017 3 次提交
  7. 01 3月, 2017 4 次提交
    • K
      commit: Add filter-node-name to block-commit · 0db832f4
      由 Kevin Wolf 提交于 
      Management tools need to be able to know about every node in the graph
and need a way to address them. Changing the graph structure was okay
because libvirt doesn't really manage the node level yet, but future
libvirt versions need to deal with both new and old version of qemu.

This new option to blockdev-commit allows the client to set a node-name
for the automatically inserted filter driver, and at the same time
serves as a witness for a future libvirt that this version of qemu does
automatically insert a filter driver.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Acked-by: NFam Zheng <famz@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>
      0db832f4
    • K
      mirror: Use real permissions in mirror/active commit block job · 4ef85a9c
      由 Kevin Wolf 提交于 
      The mirror block job is mainly used for two different scenarios:
Mirroring to an otherwise unused, independent target node, or for active
commit where the target node is part of the backing chain of the source.

Similarly to the commit block job patch, we need to insert a new filter
node to keep the permissions correct during active commit.

Note that one change this implies is that job->blk points to
mirror_top_bs as its root now, and mirror_top_bs (rather than the actual
source node) contains the bs->job pointer. This requires qemu-img commit
to get the job by name now rather than just taking bs->job.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Acked-by: NFam Zheng <famz@redhat.com>
Acked-by: NMax Reitz <mreitz@redhat.com>
      4ef85a9c
    • K
      block: Add BDRV_O_RESIZE for blk_new_open() · 55880601
      由 Kevin Wolf 提交于 
      blk_new_open() is a convenience function that processes flags rather
than QDict options as a simple way to just open an image file.

In order to keep it convenient in the future, it must automatically
request the necessary permissions. This can easily be inferred from the
flags for read and write, but we need another flag that tells us whether
to get the resize permission.

We can't just always request it because that means that no block jobs
can run on the resulting BlockBackend (which is something that e.g.
qemu-img commit wants to do), but we also can't request it never because
most of the .bdrv_create() implementations call blk_truncate().

The solution is to introduce another flag that is passed by all users
that want to resize the image.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Acked-by: NFam Zheng <famz@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>
      55880601
    • P
      qemu-img: make convert async · 2d9187bc
      由 Peter Lieven 提交于 
      the convert process is currently completely implemented with sync operations.
That means it reads one buffer and then writes it. No parallelism and each sync
request takes as long as it takes until it is completed.

This can be a big performance hit when the convert process reads and writes
to devices which do not benefit from kernel readahead or pagecache.
In our environment we heavily have the following two use cases when using
qemu-img convert.

a) reading from NFS and writing to iSCSI for deploying templates
b) reading from iSCSI and writing to NFS for backups

In both processes we use libiscsi and libnfs so we have no kernel cache.

This patch changes the convert process to work with parallel running coroutines
which can significantly improve performance for network storage devices:

qemu-img (master)
 nfs -> iscsi 22.8 secs
 nfs -> ram   11.7 secs
 ram -> iscsi 12.3 secs

qemu-img-async (8 coroutines, in-order write disabled)
 nfs -> iscsi 11.0 secs
 nfs -> ram   10.4 secs
 ram -> iscsi  9.0 secs

This patches introduces 2 new cmdline parameters. The -m parameter to specify
the number of coroutines running in parallel (defaults to 8). And the -W parameter to
allow qemu-img to write to the target out of order rather than sequential. This improves
performance as the writes do not have to wait for each other to complete.
Signed-off-by: NPeter Lieven <pl@kamp.de>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      2d9187bc
  9. 24 2月, 2017 5 次提交
  11. 12 2月, 2017 3 次提交
  13. 25 1月, 2017 1 次提交
  15. 09 1月, 2017 1 次提交
  17. 01 11月, 2016 1 次提交
  19. 28 10月, 2016 1 次提交
  21. 25 10月, 2016 2 次提交
  23. 24 10月, 2016 2 次提交
  25. 12 10月, 2016 1 次提交
    • D
      trace: provide mechanism for registering trace events · fe4db84d
      由 Daniel P. Berrange 提交于 
      Remove the notion of there being a single global array
of trace events, by introducing a method for registering
groups of events.

The module_call_init() needs to be invoked at the start
of any program that wants to make use of the trace
support. Currently this covers system emulators qemu-nbd,
qemu-img and qemu-io.

[Squashed the following fix from Daniel P. Berrange
<berrange@redhat.com>:

linux-user/bsd-user: initialize trace events subsystem

The bsd-user/linux-user programs make use of the CPU emulation
code and this now requires that the trace events subsystem
is enabled, otherwise it'll crash trying to allocate an empty
trace events bitmap for the CPU object.

--Stefan]
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NLluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Message-id: 1475588159-30598-14-git-send-email-berrange@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
      fe4db84d
  27. 21 9月, 2016 2 次提交
  29. 13 9月, 2016 1 次提交
  31. 06 9月, 2016 3 次提交
  33. 11 8月, 2016 1 次提交
  35. 08 8月, 2016 1 次提交
  37. 13 7月, 2016 2 次提交