Messages in this thread |  | | | Date | Thu, 8 Oct 1998 13:22:37 -0400 (EDT) | | From | Kenneth Albanowski <> | | Subject | Re: 'disposable' dirty pages [was: Out Of Memory in v. 2.1] |
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On Thu, 8 Oct 1998, Alan Cox wrote:
> > Which isn't quite true, unfortunately. To make this true, the act of > > making the page DISCARDABLE should also zero it. Otherwise, you can tell > > whether a page was discarded by whether it contains data, which in turn > > Not if you marked it discardable - you just said that zeroed it.
Well, that's the issue. It's more efficient if it doesn't.
> Since a page thats discarded will be returned as zero you just need a flag > around if you care. Another approach would be to fault such pages so you > pick up the buserr
Or just set up DISCARDABLE to at read/write not only clears the DISCARDABLE flag, but also zeros the memory. That would make it indistinguishable from a zero mapping.
Hmm... It's starting to sound like we are reinventing either zero mapping, or lazy clear of zero pages...
-- Kenneth Albanowski (kjahds@kjahds.com, CIS: 70705,126)
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