Date: Wed, 22 Jan 2003 19:58:09 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: David Schultz <dschultz@uclink.Berkeley.EDU> Cc: Peter Wemm <peter@wemm.org>, Garrett Wollman <wollman@lcs.mit.edu>, arch@FreeBSD.ORG Subject: Re: getsysfd() patch #1 (Re: Virtual memory question) Message-ID: <200301230358.h0N3w98H017900@apollo.backplane.com> References: <200301222323.h0MNN7co043532@khavrinen.lcs.mit.edu> <20030123022158.E5F5B2A7EA@canning.wemm.org> <20030123030509.GA52151@HAL9000.homeunix.com>
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:> > shared memory; I don't see any need for ``semi-anonymous'' shared
:> > memory. The garbage-collection problem is already bad enough.
:>
:> Meanwhile, in the real world, it is exactly what we need at work.
:> Anonymous shared memory (MAP_ANON and /dev/zero) isn't good enough.
:
:I suppose it's too late to argue that the L4 interface would be
:sufficient to solve all these problems...
Hmm. It's probably a bit overkill for what we need. We would
probably want to implement Mach IPC instead (since NetBSD is already
working on Mach). But IPC interfaces aren't really the issue here
anyway. You still need something to pass (aka a descriptor). While
you can pass shared memory around with the Mach interface, it is more
designed for the short term shared memory accompanying a message and
not really designed for memory objects (which can be larger then a
process's VM space). I don't know how L4 deals with passing memory
around.
-Matt
Matthew Dillon
<dillon@backplane.com>
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