Re: proc/stat: idle goes backward

[Oleg Nesterov]

On 08/16, Frederic Weisbecker wrote:
>
> On Fri, Aug 16, 2013 at 04:47:04PM +0200, Oleg Nesterov wrote:
> >
> > Questions:
> >
> > 	- Any other reason why it can be non-monotonic?
> >
> > 	- Should we fix this or should we document that userspace
> > 	  should handle this itself?
> >
> > 	  IOW, is this is bug or not?
>
> I don't know if we want to fix it (I personally think we should because it is not the
> first time I hear complains about this) but if we do, here is a possible fix:
>
> https://lkml.org/lkml/2013/8/8/638

Thanks! it is not easy to read the patches on lkml.org and I do
not understand this code enough. But it seems that this should
address my concerns, including the "even ignoring drivers/cpuidle/".

Except, I am not sure that these changes handle the case when
nr_iowait() change in between.

Are you going to resend?

Oleg.

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