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Date:      Thu, 13 Mar 2003 22:46:14 -0800
From:      David Schultz <das@FreeBSD.org>
To:        Alfred Perlstein <bright@mu.org>
Cc:        Mike Silbersack <silby@silby.com>, src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sys/vm vm_map.c vm_map.h vm_pageout.c
Message-ID:  <20030314064614.GA20500@HAL9000.homeunix.com>
In-Reply-To: <20030313224223.GP4145@elvis.mu.org>
References:  <200303122313.h2CNDHMU046431@repoman.freebsd.org> <20030312175458.J32334@odysseus.silby.com> <20030313005115.GA11794@HAL9000.homeunix.com> <20030313154226.X682@odysseus.silby.com> <20030313224223.GP4145@elvis.mu.org>

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Thus spake Alfred Perlstein <bright@mu.org>:
> * Mike Silbersack <silby@silby.com> [030313 13:49] wrote:
> > 
> > On Wed, 12 Mar 2003, David Schultz wrote:
> > 
> > > With KSE, all of the threads in the process are made runnable.  I
> > > assume this is to get them to all exit the kernel as fast as
> > > possible so the process can die, although there may be a better
> > > solution.  Still, it shouldn't be a big problem.
> > 
> > Well, back when I was running tests, I found that if you had 1000s of
> > processes running, the kill signal could take so long to get delivered and
> > acted upon that the same process might have to be killed by the pageout
> > daemon 3-4 times before it actually died.
> 
> Shooting from the hip here, but why not just forcefully toss away the
> process's vmspace or a subset of it?  Basically have the pageout
> deamon deallocate the "to be killed" process's address space?

Sharing would just make that a pain.  You're not even guaranteed
to get anything out of cannibalizing the address space if it's
shared.  I think I'll wait until someone presents conclusive
evidence that the requirement that processes be swapped in before
they are killed is really an issue in practice.

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