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Date:      Wed, 01 Apr 1998 18:41:19 -0800
From:      David Greenman <dg@root.com>
To:        Mikhail Teterin <mi@video-collage.com>
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: swap-leak in 2.2.5 ? 
Message-ID:  <199804020241.SAA09897@implode.root.com>
In-Reply-To: Your message of "Wed, 01 Apr 1998 21:23:08 EST." <199804020223.VAA29806@xxx.video-collage.com> 

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>David Greenman once stated:
>
>=   FreeBSD will slowly page infrequently used pages out in favor of
>=file caching, and 8MB (or 32+8) is about what you'd expect to see in
>=this case. Poul's problem seems to be different, however.
>
>Oh, this reminds me of something I wanted to ask. Is there a way to
>control this behavior? Can I specify a limit of the file cache, for
>example (with sysctl)? Or that some process is precious, and its pages
>should not be swaped for file cache (without coding madvise() into
>it)?

   The only way to do this would be to lock the pages in memory with mlock();
I don't know if the bugs have been fixed in that, however - it used to be
broken.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project

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