On Tue, Aug 9, 2016 at 9:58 AM, Alexey Dobriyan <adobri...@gmail.com> wrote: > > On Tue, Aug 09, 2016 at 12:05:43PM -0400, robert.f...@collabora.com wrote: > > From: Sonny Rao <sonny...@chromium.org> > > > > This is based on earlier work by Thiago Goncales. It implements a new > > per process proc file which summarizes the contents of the smaps file > > but doesn't display any addresses. It gives more detailed information > > than statm like the PSS (proprotional set size). It differs from the > > original implementation in that it doesn't use the full blown set of > > seq operations, uses a different termination condition, and doesn't > > displayed "Locked" as that was broken on the original implemenation. > > > > This new proc file provides information faster than parsing the potentially > > huge smaps file. > > You can "parse" /proc/*/pagemap . RSS, swap are there.
/proc/*pagemap is generally restricted and I don't believe it would quickly give PSS. > > So which ones do you really need? PSS and Swap are the most important. RSS isn't precise enough because it counts shared pages fully, and there tends to be a lot of sharing. > Why the separate anon hugepages and anon regular pages? I'm not sure if it's necessary, but that's how it's broken out in smaps. > > > + seq_printf(m, > > + "Rss: %8lu kB\n" > > + "Pss: %8lu kB\n" > > + "Shared_Clean: %8lu kB\n" > > + "Shared_Dirty: %8lu kB\n" > > + "Private_Clean: %8lu kB\n" > > + "Private_Dirty: %8lu kB\n" > > + "Referenced: %8lu kB\n" > > + "Anonymous: %8lu kB\n" > > + "AnonHugePages: %8lu kB\n" > > + "Swap: %8lu kB\n", > > + mss_sum->resident >> 10, > > + (unsigned long)(mss_sum->pss >> (10 + PSS_SHIFT)), > > + mss_sum->shared_clean >> 10, > > + mss_sum->shared_dirty >> 10, > > + mss_sum->private_clean >> 10, > > + mss_sum->private_dirty >> 10, > > + mss_sum->referenced >> 10, > > + mss_sum->anonymous >> 10, > > + mss_sum->anonymous_thp >> 10, > > + mss_sum->swap >> 10);
