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SubjectRe: [PATCH 1/4] maps: PSS(proportional set size) accounting in smaps
On Thu, Aug 16, 2007 at 09:13:47PM -0500, Matt Mackall wrote:
> On Fri, Aug 17, 2007 at 06:05:17AM +0800, Fengguang Wu wrote:
> > The "proportional set size" (PSS) of a process is the count of pages it has in
> > memory, where each page is divided by the number of processes sharing it. So if
> > a process has 1000 pages all to itself, and 1000 shared with one other process,
> > its PSS will be 1500.
> > - "ELC: How much memory are applications really using?"
> >
> > The PSS proposed by Matt Mackall is a very nice metic for measuring an process's
> > memory footprint. So collect and export it via /proc/<pid>/smaps.
> >
> > Matt Mackall's pagemap/kpagemap and John Berthels's exmap can also do the job.
> > They are comprehensive tools. But for PSS, let's do it in the simple way.
> It's a bit odd that you attribute the description of PSS to LWN rather
> than me. But anyway:
> Acked-by: Matt Mackall <>

Sorry and thank you!
I'll change it in the next take.

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