On 03/19/2018 11:59 AM, Tejun Heo wrote:
> Hello, Waiman.
>
> This looks great. A couple nitpicks below.
>
>> + 5-3. Cpuset
>> + 5.3-1. Cpuset Interface Files
> Can we put cpuset below pid? It feels weird to break up cpu, memory
> and io as they represent the three major resources and are in a
> similar fashion.
Sure. I will move it down below pid.
>> + cpuset.effective_cpus
>> + A read-only multiple values file which exists on non-root
>> + cgroups.
>> +
>> + It lists the onlined CPUs that are actually allowed to be
>> + used by tasks within the current cgroup. It is a subset of
>> + "cpuset.cpus". Its value will be affected by CPU hotplug
>> + events.
> Can we do cpuset.cpus.availble which lists the cpus available to the
> cgroup instead of the eventual computed mask for the cgroup? That'd
> be more useful as it doesn't lose the information by and'ing what's
> available with the cgroup's mask and it's trivial to determine the
> effective from the two masks.
I don't get what you want here. cpus is the cpuset's cpus_allowed mask.
effective_cpus is the effective_cpus mask. When you say cpus available
to the cgroup, do you mean the cpu_online_mask or the list of cpus from
the parent? Or do you just want to change the name to cpus.available
instead of effective_cpus?
>> + cpuset.effective_mems
>> + A read-only multiple values file which exists on non-root
>> + cgroups.
>> +
>> + It lists the onlined memory nodes that are actually allowed
>> + to be used by tasks within the current cgroup. It is a subset
>> + of "cpuset.mems". Its value will be affected by memory nodes
>> + hotplug events.
> Ditto.
>
>> +static struct cftype dfl_files[] = {
>> + {
>> + .name = "cpus",
>> + .seq_show = cpuset_common_seq_show,
>> + .write = cpuset_write_resmask,
>> + .max_write_len = (100U + 6 * NR_CPUS),
>> + .private = FILE_CPULIST,
>> + },
> Is it missing CFTYPE_NOT_ON_ROOT? Other files too.
Right, I will set CFTYPE_NOT_ON_ROOT to "cpus" and "mems" as we are not
supposed to change them in the root. The effective_cpus and
effective_mems will be there in the root to show what are available.
Cheers,
Longman
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