Date: Wed, 2 Sep 1998 18:30:53 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, tlambert@primenet.com Cc: current@FreeBSD.ORG, jdp@polstra.com, reilly@zeta.org.au Subject: Re: ELF binaries size Message-ID: <199809020830.SAA18187@godzilla.zeta.org.au>
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>> >I think Bruce is mistaking the dual mapping for a single mapping, >> >on the theory that in a unified VM and buffer cache, there can be >> >only one instance of a page hung off the VP. >> >> Nah. The dual mapping is precisely what costs a full page of real memory. > >The page is wasted through padding in the image, or it is wasted >through padding in the execution class loader. Either way, it is >wasted in the in-memory image of the application. No, padding in (relatively cheap) disk space saves an average of half a page in (relatively expensive) memory. >The savings are disk-space only. Perhaps not even there, because file systems allocate in blocks, or at least fragments. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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