[libvirt] [PATCH python] Release the GIL during virDomainGetMemoryStats

[Daniel P. Berrange]

On Tue, Sep 26, 2017 at 08:05:59PM +0300, Nir Soffer wrote:
> We discovered that the entire python process get stuck for about 30
> seconds when calling virDomain.getMemoryStats() if libvirt is stuck in
> virConnect.getAllDomainStats() on inaccessible storage. This blocking
> cause a horrible mess in oVirt.
> 
> This patches adds the standard *_ALLOW_THREADS around the call to avoid
> this unwanted blocking.
> 
> Signed-off-by: Nir Soffer <nirsof at gmail.com>
> ---
>  libvirt-override.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/libvirt-override.c b/libvirt-override.c
> index 9eba4ed..0e33afb 100644
> --- a/libvirt-override.c
> +++ b/libvirt-override.c
> @@ -363,8 +363,11 @@ libvirt_virDomainMemoryStats(PyObject *self ATTRIBUTE_UNUSED,
>          return NULL;
>      domain = (virDomainPtr) PyvirDomain_Get(pyobj_domain);
>  
> +    LIBVIRT_BEGIN_ALLOW_THREADS;
>      nr_stats = virDomainMemoryStats(domain, stats,
>                                      VIR_DOMAIN_MEMORY_STAT_NR, 0);
> +    LIBVIRT_END_ALLOW_THREADS;
> +
>      if (nr_stats == -1)
>          return VIR_PY_NONE;

Reviewed-by: Daniel P. Berrange <berrange at redhat.com>

I'll squash in the same fix for virDomainGetDiskErrors too

Regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|