Messages in this thread | | | Date | Fri, 26 Jan 2007 23:00:05 +1100 | From | Nick Piggin <> | Subject | Re: [RFC] Track mlock()ed pages |
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Andrew Morton wrote: > On Thu, 25 Jan 2007 22:36:17 -0800 (PST) > Christoph Lameter <clameter@sgi.com> wrote: >
>>>I can't think of an easy way to do this without per-page state. ie. >>>another page flag. >> >>Thats what I am trying to avoid. > > > You could perhaps go for a walk across all the other vmas which presently > map this page. If any of them have VM_LOCKED, don't increment the counter. > Similar on removal: only decrement the counter when the final mlocked VMA > is dropping the pte.
Can't do with un-racily because you can't get that information atomically, AFAIKS. When / if we ever lock the page in fault handler, this could become easier... but that seems nasty to do in fault path, even if only for VM_LOCKED vmas.
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