Messages in this thread | | | Date | Tue, 15 Feb 2005 07:49:06 -0800 | From | Paul Jackson <> | Subject | Re: [RFC 2.6.11-rc2-mm2 7/7] mm: manual page migration -- sys_page_migrate |
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Robin wrote: > Then how do you handle overlapping nodes. If I am doing a 5->4, 4->3, > 3->2, 2->1 shift ...
Then do the shifts in the other order, first 2->1, then 3->2, ...
So now you ask, what if you are doing a rotation? Use a temporary node: 2->tmp, 3->2, ..., N->(N-1), tmp->N.
So now you ask, what if you are doing a rotation involving _all_ nodes, and have nothing you can use as a temporary node?
Argh I say ... would anyone really do that? Or perhaps it makes sense to have the system call take a virtual address range (and hence a pid). In which case, you can do one page at a time, if need be, and get any foolhardy migration possible.
Or perhaps some integration with Andi's mbind/mempolicy make sense. I'm not quite following Andi's comments on this, so I can't say one way or the other if this is good.
-- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@sgi.com> 1.650.933.1373, 1.925.600.0401 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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