Re: [PATCH 2/2] show nohz_full cpus in sysfs

[Rik van Riel]

On 03/28/2015 12:02 PM, Frederic Weisbecker wrote:
> 2015-03-27 22:50 GMT+01:00  <riel@xxxxxxxxxx>:
>> From: Rik van Riel <riel@xxxxxxxxxx>
>>
>> Currently there is no way to query which CPUs are in nohz_full
>> mode from userspace.
> 
> Well you can watch dmesg | grep NO_HZ
> But surely sysfs is more convenient from an app.
> 
> I guess it's ok, as long as it's strictly Read Only. Here it seems to
> be the case. And it's not chmod'able, right?

I followed the other code for files in that directory.

Quick testing shows that the cpu info files in
/sys/devices/system/cpu are chmoddable, but writing
to them fails with -EIO because there is no function
set up to handle writes. So yeah, read only :)

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