| Subject | Re: Minutes from Feb 21 LSE Call | From | (Eric W. Biederman) | Date | 22 Feb 2003 17:42:53 -0700 |
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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?
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