Messages in this thread | | | Subject | Re: [PATCH 2.5.43-mm2] New shared page table patch | From | (Eric W. Biederman) | Date | 21 Oct 2002 08:55:24 -0600 |
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"Martin J. Bligh" <mbligh@aracnet.com> writes:
> >> For reference, one of the tests was TPC-H. My code reduced the number of > >> allocated pte_chains from 5 million to 50 thousand. > > > > Don't tease, what did that do for performance? I see that someone has > > already posted a possible problem, and the code would pass for complex for > > most people, so is the gain worth the pain? > > In many cases, this will stop the box from falling over flat on it's > face due to ZONE_NORMAL exhaustion (from pte-chains), or even total > RAM exhaustion (from PTEs). Thus the performance gain is infinite ;-)
So why has no one written a pte_chain reaper? It is perfectly sane to allocate a swap entry and move an entire pte_chain to the swap cache.
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