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 SUSE Labs
