Date: Wed, 25 Jun 2003 19:21:19 +0400 From: Dmitry Sivachenko <demon@FreeBSD.org> To: Pawel Jakub Dawidek <nick@garage.freebsd.pl> Cc: freebsd-arch@FreeBSD.org Subject: Re: Jailed sysvipc implementation. Message-ID: <20030625152119.GA31396@fling-wing.demos.su> In-Reply-To: <20030625150221.GL7587@garage.freebsd.pl> References: <20030624164602.GW7587@garage.freebsd.pl> <20030625135106.GA19868@fling-wing.demos.su> <20030625140518.GA23435@fling-wing.demos.su> <20030625144849.GJ7587@garage.freebsd.pl> <20030625145233.GA28322@fling-wing.demos.su> <20030625150221.GL7587@garage.freebsd.pl>
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On Wed, Jun 25, 2003 at 05:02:21PM +0200, Pawel Jakub Dawidek wrote: > On Wed, Jun 25, 2003 at 06:52:33PM +0400, Dmitry Sivachenko wrote: > +> > But you got still *one* memory zones for every jail and main host. > +> > +> Yes, that is exactly what I want. > +> This is similar to separate IP stack for each jail: this is more powerful > +> solution, but more expensive (uses more kernel memory). > > But note that my implementation allocates memory "on demand". This is part of the problem: with single memory zone for all jails, less memory is allocated. With private memory zones, if m jails use IPC, you need to allocate m*M kbytes (for some value of M you consider sufficient for one jail). With one memory zone for all jails, it is enough to allocate N kbytes where M < N < m*M, because every jail will not use all M kbytes at the same time. > If IPC syscall will not be used inside of jail memory will not be allocated. > If think also that this will be trivial to add value to jail struct > that will thell if we want separate IPC memory zones for this jail or not. > > +> Jail is not a true virtual machine. > +> Let's keep it a *light* virtual machine replacement, with single IP stack, > +> one memory zones for all jails and host, etc. > > I think it should be and it isn't now because of implementaion problems. > Am I wrong? Poul? Robert? >
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