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Hanna Linder <hannal@us.ibm.com> writes: > LSE Con Call Minutes from Feb21 > > Minutes compiled by Hanna Linder hannal@us.ibm.com, please post > corrections to lse-tech@lists.sf.net. > > Object Based Reverse Mapping: > (Dave McCracken, Ben LaHaise, Rik van Riel, Martin Bligh, Gerrit Huizenga) > > Ben said none of the users have been complaining about > performance with the existing rmap. Martin disagreed and said Linus, > Andrew Morton and himself have all agreed there is a problem. > One of the problems Martin is already hitting on high cpu machines with > large memory is the space consumption by all the pte-chains filling up > memory and killing the machine. There is also a performance impact of > maintaining the chains. Note: rmap chains can be restricted to an arbitrary length, or an arbitrary total count trivially. All you have to do is allow a fixed limit on the number of people who can map a page simultaneously. The selection of which chain to unmap can be a bit tricky but is relatively straight forward. Why doesn't someone who is seeing this just hack this up? Eric - 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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