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From: Lowell Gilbert <freebsd-lists@be-well.ilk.org>
To: Rod Person <rodperson@rodperson.com>
Subject: Re: Help porting Linux app - getting Free Memory and Real Memory
References: <5156316F.9050202@rodperson.com>
 <20130329032845.GG81066@server.rulingia.com>
Date: Fri, 29 Mar 2013 08:34:06 -0400
In-Reply-To: <20130329032845.GG81066@server.rulingia.com> (Peter Jeremy's
 message of "Fri, 29 Mar 2013 14:28:45 +1100")
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Peter Jeremy <peter@rulingia.com> writes:

> On 2013-Mar-29 20:27:27 -0400, Rod Person <rodperson@rodperson.com> wrote:
>>Everything is going we except that the program gives warnings that there
>>isn't enough free memory on the system to perform certain actions.
>
> That premise sounds suspiciously like the upstream author doesn't
> understand how Unix VM works.

To be more blunt, these checks may well be useless on Linux.
On a quick look, you seem to maintain three ports: idutils, mspdebug,
and jogl. I wouldn't expect a free-memory check to be appropriate on any
of those.

In any case, the definition of "free memory" is different between the VM
systems in Linux and BSD . Even if the checks do make sense, the FreeBSD
implementation would at the minimum have to include all of the pages
that are allocated but not mapped.