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
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