[Victor Stinner <vstin...@redhat.com>]
> I guess that INADA-san used pyperformance --track-memory.
>
> pyperf --track-memory doc:
> "--track-memory: get the memory peak usage. it is less accurate than
> tracemalloc, but has a lower overhead. On Linux, compute the sum of
> Private_Clean and Private_Dirty memory mappings of /proc/self/smaps.
> ...

So I'll take that as meaning essentially that it's reporting what RSS
would report if it ignored shared pages (so peak # of private pages
actually backed by physical RAM).

Clear as mud how MADV_FREE affects that.
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