Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 20 Feb 2003 17:44:17 -0800 | From | "Martin J. Bligh" <> | Subject | Re: Performance of partial object-based rmap |
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> The performance delta between 2.5.62-mjb1 and 2.5.62-mjb2 is caused > by the partial object-based rmap patch (written by Dave McCracken). > I expect this patch to have an increasing impact on workloads with > more processes, and it should give a substantial space saving as > well as a performance increase. Results from 16x NUMA-Q system ... > > Profile comparison: > > before > 15525 page_remove_rmap > 6415 page_add_rmap > > after > 2055 page_add_rmap > 1983 page_remove_rmap
Did some space consumption comparisons on make -j 256:
before: 24116 pte_chain objects in slab cache after: 716 pte_chain objects in slab cache
The vast majority of anonymous pages (for which we're using the non object based method) are singletons, and hence use pte_direct ... hence the massive space reduction.
M.
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