Re: [PATCH v4 2/2] cpusets,isolcpus: add file to show isolated cpus in cpuset

[Peter Zijlstra]

On Mon, Mar 02, 2015 at 02:15:39PM +0800, Zefan Li wrote:
> Hi Rik,
> 
> > Subject: cpusets,isolcpus: add file to show isolated cpus in cpuset
> > 
> > The previous patch makes it so the code skips over isolcpus when
> > building scheduler load balancing domains. This makes it hard to
> > see for a user which of the CPUs in a cpuset are participating in
> > load balancing, and which ones are isolated cpus.
> > 
> > Add a cpuset.isolcpus file with info on which cpus in a cpuset are
> > isolated CPUs.
> > 
> > This file is read-only for now. In the future we could extend things
> > so isolcpus can be changed at run time, for the root (system wide)
> > cpuset only.
> > 
> 
> One Question, why not add a /sys/devices/system/cpu/isolated instead?

It would leave userspace to calculate the result for any one cpuset
itself. Furthermore, is that /sys thing visible for all nested
containers?
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