On Mon 19-09-16 11:16:31, Robert Foss wrote:
> On 2016-09-14 05:12 AM, Michal Hocko wrote:
> > On Tue 13-09-16 13:27:39, Sonny Rao wrote:
> > > Given that smaps
> > > doesn't provide this in a straightforward way, what do you think is
> > > the right way to provide this information?
> > 
> > I would be tempted to sneak it into /proc/<pid>/statm because that looks
> > like a proper place but getting this information is not for free
> > performance wise so I am not really sure something that relies on this
> > file would see unexpected stalls. Maybe this could be worked around by
> > some caching... I would suggest to check who is actually using this file
> > (top/ps etc...)
> What would this caching look like? Can any information be re-used between
> vma walks?

yes basically return the same value if called within HZ or something
similar. But that assumes that statm latency really matters and it is
called often enough.

Michal Hocko
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