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mmap modified data not to be swapped out but saved?

Subject: mmap modified data not to be swapped out but saved?
From: Ben Dougall <email@hidden>
Date: Sat, 2 Oct 2004 11:21:02 +0100
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with mmap once you've read in some of a file and made some modifications is there anyway to avoid those modifications being swapped out to the backing store? what would be preferable is in the event of the system needing more memory, rather than swapping out those modifications, save them directly to the original file -- is that what happens now, by default maybe, or is there anyway of doing that?

thanks, ben.

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