linux-kernel - Imprecise definition for proportional set size in documentation

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Message-ID: <CAKEGsXR_ZDwydz2Ed3gvqCbnVA_vT3PZG0a2RLbgj5q4fP5LuQ@mail.gmail.com>
Date:   Wed, 21 Oct 2020 21:45:13 +0200
From:   Albert Netymk <albertnetymk@...il.com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Imprecise definition for proportional set size in documentation

>From https://www.kernel.org/doc/html/latest/filesystems/proc.html
```
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.
```
The definition is a bit imprecise if a process uses multiple-mapping.
A real example is ZGC in OpenJDK, as asked at
https://superuser.com/questions/1485370/linux-misreports-process-size-with-heap-multi-mapping

A more precise wording could be something like `..., where each page
is divided by the number of mappings associated with it.`

PS: I have read
https://www.kernel.org/doc/html/latest/admin-guide/reporting-bugs.html,
but it's still unclear to me whether a mail or a ticket in bugzilla is
preferred.  Since this is just a documentation issue, maybe a mail is
fine.

/Albert