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Date:      Sat, 17 Apr 1999 04:45:11 +0900
From:      "Daniel C. Sobral" <>
To:        David Schwartz <>
Cc:        chat@FreeBSD.ORG
Subject:   Re: swap-related problems
Message-ID:  <>
References:  <000001be8833$f9dd1d80$>

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David Schwartz wrote:
>         There might be a demand for, for example, separate swap for critical and
> non-critical processes. Or there may be a wish to reserve a certain amount
> of swap just for critical processes, or to require overcommittment to exceed
> a certain amount before 'critical' processes have their allocations fail.
>         This is a tuning question. It's easily possible to err in either direction.
>         The point is, however, that a well-behaved process can't behave well
> without adequate feedback. And a fully-overcommitting kernel generally can't
> provide that feedback. A never-overcommitting kernel can, but unfortunately,
> that simply requires too much swap. Surely a reasonable compromise can be
> struck.

Sure. We call it limiting a process/user datasize. This solution is
not more complicated than any other solution short of full
pre-allocation, even if you do not believe so.

Daniel C. Sobral			(8-DCS)

	"Well, Windows works, using a loose definition of 'works'..."

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