[libvirt] [PATCH] qemu: Avoid excessive calls to qemuDomainObjSaveJob()

[Eric Blake]

On 04/10/2012 07:45 AM, Jiri Denemark wrote:
> As reported by Daniel Berrangé, we have a huge performance regression
> for virDomainGetInfo() due to the change which makes virDomainEndJob()
> save the XML status file every time it is called. Previous to that
> change, 2000 calls to virDomainGetInfo() took ~2.5 seconds. After that
> change, 2000 calls to virDomainGetInfo() take 2 *minutes* 45 secs.
> 
> We made the change to be able to recover from libvirtd restart in the
> middle of a job. However, only destroy and async jobs are taken care of.
> Thus it makes more sense to only save domain state XML when these jobs
> are started/stopped.
> ---
>  src/qemu/qemu_domain.c  |   21 ++++++++++++++++++---
>  src/qemu/qemu_domain.h  |    5 +++++
>  src/qemu/qemu_process.c |    4 ++++
>  3 files changed, 27 insertions(+), 3 deletions(-)

ACK.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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