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Subject: Re: Inconsistancies in /proc (status vs statm) leading to wrong
	documentation (proc.txt)
From: Albert Cahalan <albert@users.sf.net>
To: linux-kernel mailing list <linux-kernel@vger.kernel.org>
Cc: eric.valette@free.fr
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Eric Valette writes:

> I'm currently trying use mlockall for a soft RT application and was 
> concerned by the memory usage of my (big) RT process. So I stated to
> look at /proc/<PID>/status and /proc/<PID>/statm and then to the  
> documentation of statm (Documentation/filesystem/proc.txt) because
> unexplained values are rather useless.
>
> The doc currently says :
> -------------------------------------------------------------------------
>   Field    Content
>   size     total program size (pages)  (same as VmSize in status)

The documentation is incorrect. It was written to match a buggy
implementation in early 2.6.x kernels.

VmSize is the address space occupied, excluding memory-mapped IO.
The statm value is the address space occupied.

> May I suggest :
>  - To use consistent memory size units between status and statm,

No way. This would instantly break the "top" program.


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