[libvirt] [PATCH 16/17] qemu: Implement hypervisor_period and hypervisor_quota's modification

[Eric Blake]

On 08/03/2012 12:36 AM, Hu Tao wrote:
> From: Wen Congyang <wency at cn.fujitsu.com>
> 
> allow the user change/get hypervisor's period and quota when the vm is running.
> ---
>  include/libvirt/libvirt.h.in |   16 +++++
>  src/qemu/qemu_driver.c       |  133 +++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 148 insertions(+), 1 deletion(-)
> 
> diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
> index 15c08c1..dd34295 100644
> --- a/include/libvirt/libvirt.h.in
> +++ b/include/libvirt/libvirt.h.in
> @@ -692,6 +692,22 @@ typedef virTypedParameter *virTypedParameterPtr;
>  #define VIR_DOMAIN_SCHEDULER_VCPU_QUOTA "vcpu_quota"
>  
>  /**
> + * VIR_DOMAIN_SCHEDULER_HYPERVISOR_PERIOD:

more of the s/hypervisor/emulator/ renaming

> + *
> + * Macro represents the enforcement period for a quota, in microseconds,
> + * when using the posix scheduler, as a ullong.

Enforcement period for what?  I would suggest:

Macro represents the enforcement period for a quota in microseconds,
when using the posix scheduler, for all emulator activity not tied to
vcpus, as a ullong.

> + */
> +#define VIR_DOMAIN_SCHEDULER_HYPERVISOR_PERIOD "hypervisor_period"
> +
> +/**
> + * VIR_DOMAIN_SCHEDULER_HYPERVISOR_QUOTA:
> + *
> + * Macro represents the maximum bandwidth to be used within a period,
> + * when using the posix scheduler, as an llong.

and similarly.  It may mean rewording the existing descriptions of vcpu
quota to be more obvious that they limit only vcpu activity.

> @@ -7420,6 +7420,40 @@ cleanup:
>  }
>  
>  static int
> +qemuSetHypervisorBWLive(virDomainObjPtr vm, virCgroupPtr cgroup,

Probably copying from existing naming, but BW looks awkward to me (I
first read it as black/white, not bandwidth); spelling it out would help.


>  static int
> +qemuGetHypervisorBWLive(virDomainObjPtr vm, virCgroupPtr cgroup,
> +                        unsigned long long *period, long long *quota)

Same comment about spelling out BW as Bandwidth.

> +{
> +    virCgroupPtr cgroup_hypervisor = NULL;
> +    qemuDomainObjPrivatePtr priv = NULL;
> +    int rc;
> +    int ret = -1;
> +
> +    priv = vm->privateData;
> +    if (priv->nvcpupids == 0 || priv->vcpupids[0] == vm->pid) {
> +        /* We donot create sub dir for each vcpu */

s/donot/don't/

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

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