Messages in this thread | | | Date | Fri, 12 Mar 2004 21:51:04 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] per-backing dev unplugging #2 |
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On Fri, Mar 12 2004, Chris Mason wrote: > On Fri, 2004-03-12 at 15:34, Jens Axboe wrote: > > > > > I don't see how this can make too much of a difference, aside of perhaps > > just moving the window a little. If page->mapping can disappear here, > > that's still a possibility. > > As Andrew pointed out, the mapping struct won't disappear, but > page->mapping may go null. So the idea is to use barriers to get a > trusted copy of page->mapping, and use the copy everywhere.
So trusting an atomic assignment of mapping = page->mapping, it should work. It feels a bit icky, though.
-- Jens Axboe
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