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Re: [libvirt] [PATCHv7 16/18] qemu: refactor qemuDomainGetStatsCpu




On 10/22/18 4:01 AM, Wang Huaqiang wrote:
> Refactoring qemuDomainGetStatsCpu, make it possible to add
> more CPU statistics.
> 
> Signed-off-by: Wang Huaqiang <huaqiang wang intel com>
> ---
>  src/qemu/qemu_driver.c | 45 ++++++++++++++++++++++-----------------------
>  1 file changed, 22 insertions(+), 23 deletions(-)
> 

Maybe instead of inverting the logic, let's create a cgroup helper...

qemuDomainGetStatsCpuCgroup(dom, record, *maxparams)
{
    logic as is now
}


static int
qemuDomainGetStatsCpu(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
                      virDomainObjPtr dom,
                      virDomainStatsRecordPtr record,
                      int *maxparams,
                      unsigned int privflags ATTRIBUTE_UNUSED)
{
    return qemuDomainGetStatsCpuCgroup(dom, record, maxparams);
}


Then the subsequent patch would alter the above check and add the new call.

John

> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index a52e249..12a5f8f 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -19711,30 +19711,29 @@ qemuDomainGetStatsCpu(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
>      unsigned long long sys_time = 0;
>      int err = 0;
>  
> -    if (!priv->cgroup)
> -        return 0;
> -
> -    err = virCgroupGetCpuacctUsage(priv->cgroup, &cpu_time);
> -    if (!err && virTypedParamsAddULLong(&record->params,
> -                                        &record->nparams,
> -                                        maxparams,
> -                                        "cpu.time",
> -                                        cpu_time) < 0)
> -        return -1;
> +    if (priv->cgroup) {
> +        err = virCgroupGetCpuacctUsage(priv->cgroup, &cpu_time);
> +        if (!err && virTypedParamsAddULLong(&record->params,
> +                                            &record->nparams,
> +                                            maxparams,
> +                                            "cpu.time",
> +                                            cpu_time) < 0)
> +            return -1;
>  
> -    err = virCgroupGetCpuacctStat(priv->cgroup, &user_time, &sys_time);
> -    if (!err && virTypedParamsAddULLong(&record->params,
> -                                        &record->nparams,
> -                                        maxparams,
> -                                        "cpu.user",
> -                                        user_time) < 0)
> -        return -1;
> -    if (!err && virTypedParamsAddULLong(&record->params,
> -                                        &record->nparams,
> -                                        maxparams,
> -                                        "cpu.system",
> -                                        sys_time) < 0)
> -        return -1;
> +        err = virCgroupGetCpuacctStat(priv->cgroup, &user_time, &sys_time);
> +        if (!err && virTypedParamsAddULLong(&record->params,
> +                                            &record->nparams,
> +                                            maxparams,
> +                                            "cpu.user",
> +                                            user_time) < 0)
> +            return -1;
> +        if (!err && virTypedParamsAddULLong(&record->params,
> +                                            &record->nparams,
> +                                            maxparams,
> +                                            "cpu.system",
> +                                            sys_time) < 0)
> +            return -1;
> +    }
>  
>      return 0;
>  }
> 


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