Date: Thu, 30 Mar 2000 16:36:44 -0800 From: Peter Wemm <peter@netplex.com.au> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: "Daniel O'Connor" <doconnor@gsoft.com.au>, cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/alpha/include vmparam.h src/sys/conf opt Message-ID: <20000331003644.BFE8E1CDF@overcee.netplex.com.au> In-Reply-To: Message from Matthew Dillon <dillon@apollo.backplane.com> of "Thu, 30 Mar 2000 08:51:34 PST." <200003301651.IAA73393@apollo.backplane.com>
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Matthew Dillon wrote: > > : > :Matthew Dillon wrote: > :> : > :> :"Daniel O'Connor" wrote: > :> :> > :> :> On 30-Mar-00 Peter Wemm wrote: > :> :> > that comment is bogus.. The only practical limit is how much phys ica > : l > :> :> > ram you want to lock up as this stuff isn't paged out or swap back ed. > :> :> > :> :> Is it [easily] possible to make its pageable? > :> : > :> :I don't know. Probably, if one wanted to cut/paste code from the likes > :> :of the swap-backed code in the vn device. > :> > :> I couldn't find the beginning of this thread, but if you are talking > :> about making the PV entries pageable, it isn't possible. > : > :No, the shared memory segments themselves, not the PV entries. Presently > :the pages are wired directly into the processes that attach to them and > :they are not pageable. (which is a distinct advantage over using mmap for > :temporary storage if you don't want pagedaemon messing with it - even for > :MAP_ANON) > : > :Cheers, > :-Peter > > I'm still confused. SysV shared memory segments are swap-backed. No, I'm the one that is confused. I had missed the fact that it was using a swap pager object. Cheers, -Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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