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Date:      Fri, 12 Jul 2002 22:23:37 -0700
From:      David Schultz <dschultz@uclink.Berkeley.EDU>
To:        Sean Kelly <smkelly@zombie.org>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: swapoff?
Message-ID:  <20020713052337.GA662@HAL9000.wox.org>
In-Reply-To: <20020713040247.GA82181@edgemaster.zombie.org>
References:  <20020713040247.GA82181@edgemaster.zombie.org>

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Thus spake Sean Kelly <smkelly@zombie.org>:
> My familiarity with the "workings" of FreeBSD is still pretty minimal. Are
> there certain reasons that there currently is no way to stop paging to a
> device/file?

I imagine the implementation of this would be complicated, as it
is in Linux.  You'd have to prevent further allocations on the
swap device, then figure out where to evict the pages already
allocated on the device.  You also have to be able to back out if
you run out of space to put things in the process.  Maybe someone
who is familiar with the race conditions involved will implement
it some day, but swapoff would only occasionally be useful... at
least until everyone is using hot-swappable swap.  ;-)

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