Messages in this thread |  | | Date | Mon, 29 Oct 2001 15:25:36 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: please revert bogus patch to vmscan.c |
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On Mon, 29 Oct 2001, Benjamin LaHaise wrote: > > I think it's far more expensive to pull a page back in from disk.
Note that _if_ the page is so often accessed that it stays in the TLB, it won't ever hit the disk. We _will_ do a TLB invalidate when we unmap it, and it will get re-mapped long before it's written out.
So it's more likely to result in extra soft-faults, but considering that if the system is paging stuff out we'll almost certainly be doing enough context switches that the thing doesn't matter.
And avoiding the extra TLB flush (for _every_ page scanned) is noticeable according to Andrea.
Linus
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