Messages in this thread | | | Date | Sat, 28 Mar 2015 19:06:10 +0100 | From | Frederic Weisbecker <> | Subject | Re: [PATCH 2/2] show nohz_full cpus in sysfs |
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On Sat, Mar 28, 2015 at 12:15:56PM -0400, Rik van Riel wrote: > On 03/28/2015 12:02 PM, Frederic Weisbecker wrote: > > 2015-03-27 22:50 GMT+01:00 <riel@redhat.com>: > >> From: Rik van Riel <riel@redhat.com> > >> > >> 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 :)
Perfect :-)
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