Date: Thu, 30 Mar 2000 02:47:00 -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: <20000330104700.44DEE1CD7@overcee.netplex.com.au> In-Reply-To: Message from Matthew Dillon <dillon@apollo.backplane.com> of "Wed, 29 Mar 2000 23:53:58 PST." <200003300753.XAA68882@apollo.backplane.com>
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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 physica
l
> :> > ram you want to lock up as this stuff isn't paged out or swap backed.
> :>
> :> 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
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