Date: Tue, 10 Dec 1996 16:09:06 -0500 (EST) From: John Dyson <dyson@dyson.iquest.net> To: erich@lodgenet.com (Eric L. Hernes) Cc: kelly@fsl.noaa.gov, erich@lodgenet.com, scrappy@hub.org, hackers@freebsd.org Subject: Re: Multiple Buffer allocation of Shared Memory Message-ID: <199612102109.QAA00660@dyson.iquest.net> In-Reply-To: <199612102020.OAA17243@jake.lodgenet.com> from "Eric L. Hernes" at Dec 10, 96 02:20:37 pm
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> > correct me if I'm wrong here, but doesn't MFS allocate backing store > in swap, so it could be paged out via physical I/O too. In either case > the physical IO appears async -- the physio won't happen until > the system needs ram, or the pages are inactive. If you've got enough > ram, the mmap'ed file won't be flushed out no matter what the underlying > FS is. Or do I just have too much faith in the VM system? ;-) > It is flushed on msync paged out when memory gets scarce. I think that the update process also syncs the mmaped regions (with vnode backing.) John
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