Re: How do you accurately determine a process' RAM usage?

[Andrew Morton]

P@xxxxxxxxxxxxxx wrote:
>
> I wrote a tool to report how much RAM a
>  particular program (apache for e.g.) was using:
>  http://www.pixelbeat.org/scripts/ps_mem.py
> 
>  I was then pointed at the following:
>  http://wiki.apache.org/spamassassin/TopSharedMemoryBug
>  which describes how copy-on-write pages are
>  not counted as shared since 2.6.
> 
>  So how can one determine how much RAM a process is using?
>  Seems like a fundamental requirement to me.
>  Could we add a "SharedTotal" column to /proc/$$/statm for e.g. ?

Calculating this stuff accurately is very expensive.  You'll get a better
answer using proc-pid-smaps.patch from -mm, but even that won't tell you
things about sharing levels of the pages.

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