Messages in this thread | | | Date | Mon, 16 Aug 1999 23:39:12 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [bigmem-patch] 4GB with Linux on IA32 |
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On Tue, 17 Aug 1999, Andrea Arcangeli wrote: > > This other incremental patch will make the bigmem code safe w.r.t. raw-io:
Well, it makes it safe, but doesn't actually make it _work_. As such, it's not very usable. I suspect it had better be our current fix, though.
I also suspect that we can't just break all drivers, so for now I would just make this work for anonymous pages and ignore direct-IO. The driver issue is going to need some serious thinking, and doing it for anonymous pages only may be enough for many things. Especially if anonymous pages _prefer_ the high-memory pages.
Oh, and copied-on-write pages count as anonymous, I assume you did that already (ie when you allocate a new page and copy the old contents into it, you might as well consider the new page to be anonymous, even though it gets its initial data from a potentially non-anonymous page).
Linus
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