Date: Fri, 30 Apr 2004 08:30:04 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: phk@phk.freebsd.dk Cc: freebsd-current@freebsd.org Subject: Re: DEVFS in a chroot? Message-ID: <20040430.083004.116247770.imp@bsdimp.com> In-Reply-To: <7432.1083333726@critter.freebsd.dk> References: <20040430.075448.70646001.imp@bsdimp.com> <7432.1083333726@critter.freebsd.dk>
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In message: <7432.1083333726@critter.freebsd.dk>
"Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
: In message <20040430.075448.70646001.imp@bsdimp.com>, "M. Warner Losh" writes:
: >In message: <6695.1083331489@critter.freebsd.dk>
: > "Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
: >: In message <20040430.070341.26991317.imp@bsdimp.com>, "M. Warner Losh" writes:
: >: >In message: <5473.1083327210@critter.freebsd.dk>
: >: > "Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
: >: >: >Should I mount /var/chroot/dev as type devfs?
: >: >:
: >: >: Yes:
: >: >:
: >: >: mount -t devfs randomargument /var/chroot/dev
: >: >
: >: >What if I have hundreds of these chroots? We build our product inside
: >: >a chroot right now and I'm worried what the overhead of
: >: >mounting/unmounting this for every build would be...
: >:
: >: As far as I recall, our mountlist handling is not optimised for
: >: hundreds of simultaneous mountpoints: we basically walk the list.
: >: That said, I belive we only do so during the actual mount/unmount
: >: operations, so I do not think there is a performance issue as such.
: >
: >Would the performance issues be mitigated by mounting/unmounting devfs
: >all the time? Eg, only mount it while it is actively being used?
:
: I think you would actually make it worse that way...
How would that make it worse? Seems like I'm in a no win situation:
if I mount one for everybody, then the system grinds to a halt because
the mount lists are too long. If I mount and unmount it all the time,
things are also bad in some unspecified way.
Warner
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