Re: [PATCH 3/4] cpusets,isolcpus: add file to show isolated cpus in cpuset

From: Rik van Riel
Date: Wed Mar 18 2015 - 19:40:28 EST

On 03/18/2015 12:47 PM, Tejun Heo wrote:
> On Mon, Mar 09, 2015 at 12:12:09PM -0400, riel@xxxxxxxxxx wrote:
>> From: Rik van Riel <riel@xxxxxxxxxx>
>> 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.
> Didn't Li say that this is trivially computable from userland? I'm
> not sure this knob actually belongs to cpuset.

I don't know whether the information to compute this is
always visible from userland. I am happy to drop this
patch if Li prefers things that way, though.


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