[libvirt] [PATCH 4/9] conf: Replace 'virResctrlAllocIsEmpty' with @n==0 for indicating no resctrl allocation in configuration file

[Michal Privoznik]

On 5/23/19 11:34 AM, Wang Huaqiang wrote:
> @n denotes the number of <cache> element under <cputune/cachetune>
> element in function 'virDomainCachetuneDefParse'  or the number of
> <node> element under <cputune/memorytune> element in function
> virDomainMemorytuneDefParse'.
> Originally it is using 'virResctrlAllocIsEmpty' function to judge
> if no resctrl allocation defined in <cputune/cachetune> or
> <cputune/memorytune> element, this role could be replaced with
> checking if @n is zero or not.
> 
> This replacement is more efficient and avoiding a long function
> calling path.
> 
> Signed-off-by: Wang Huaqiang <huaqiang.wang at intel.com>
> ---
>   src/conf/domain_conf.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 9c95467..dcfd2dd 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -19360,7 +19360,7 @@ virDomainCachetuneDefParse(virDomainDefPtr def,
>   
>       /* If no <cache> element or <monitor> element in <cachetune>, do not
>        * append any resctrl element */
> -    if (!resctrl->nmonitors && virResctrlAllocIsEmpty(alloc)) {
> +    if (!resctrl->nmonitors && n == 0) {
>           ret = 0;
>           goto cleanup;
>       }
> @@ -19550,7 +19550,7 @@ virDomainMemorytuneDefParse(virDomainDefPtr def,
>               return -1;
>       }
>   
> -    if (virResctrlAllocIsEmpty(alloc))
> +    if (n == 0)
>           return 0;
>   
>       /*
> 

Is this a good idea? virResctrlAllocIsEmpty does more than plain n == 0.

Michal