From owner-freebsd-hackers  Wed Oct 23 12:14: 4 2002
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Date: Wed, 23 Oct 2002 12:13:56 -0700
From: David Schultz <dschultz@uclink.Berkeley.EDU>
To: Poul-Henning Kamp <phk@critter.freebsd.dk>
Cc: Danny Braniss <danny@cs.huji.ac.il>, freebsd-hackers@FreeBSD.ORG
Subject: Re: malloc
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Mail-Followup-To: Poul-Henning Kamp <phk@critter.freebsd.dk>,
	Danny Braniss <danny@cs.huji.ac.il>, freebsd-hackers@FreeBSD.ORG
References: <20021023185024.GA468@HAL9000.homeunix.com> <44584.1035399419@critter.freebsd.dk>
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Thus spake Poul-Henning Kamp <phk@critter.freebsd.dk>:
> >A harder problem to solve is fragmentation for long-running
> >servers, where the RSS tends to creep upwards over time as virtual
> >memory fills with holes.
> 
> This is where you want to run phkmalloc with the 'H' option.
> It practically makes it a non-issue last I tried.

Perhaps phkmalloc could be made self-tuning with regards to 'H';
I doubt many people know when to use that feature.  For example,
you might have a heuristic where phkmalloc detects that the program
has been running for a long time or has called malloc() and free()
many times, so it starts using madvise() on some free pages.

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