From owner-cvs-all  Wed Nov  6 11:16: 3 2002
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Date: Wed, 6 Nov 2002 14:16:00 -0500 (EST)
From: Jeff Roberson <jroberson@chesapeake.net>
To: Poul-Henning Kamp <phk@FreeBSD.org>
Cc: cvs-committers@FreeBSD.org, <cvs-all@FreeBSD.org>
Subject: Re: cvs commit: src/sys/sys malloc.h src/sys/kern kern_malloc.c
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On Fri, 1 Nov 2002, Poul-Henning Kamp wrote:

> phk         2002/11/01 10:58:13 PST
>
>   Modified files:
>     sys/sys              malloc.h
>     sys/kern             kern_malloc.c
>   Log:
>   Introduce malloc_last_fail() which returns the number of seconds since
>   malloc(9) failed last time.  This is intended to help code adjust
>   memory usage to the current circumstances.
>
>   A typical use could be:
>           if (malloc_last_fail() < 60)
>                   reduce_cache_by_one();
>
>   Revision  Changes    Path
>   1.113     +16 -0     src/sys/kern/kern_malloc.c
>   1.68      +1 -0      src/sys/sys/malloc.h
>

I would like to add a 'flush' callback to uma.  So each zone could get a
callback when the system is low on memory and it could reduce it's memory
footprint.  This would be very effective for something like the vnode
cache or the directory cache, etc.

What do you think of this?  It would be trivial to add.

Cheers,
Jeff


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