On Fri, 22 Jun 2012 10:24:58 -0400
"John Stoffel" [off-list ref] wrote:

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"Rik" == Rik van Riel [off-list ref] writes:

Rik> A long time ago, we decided to limit the number of VMAs per
Rik> process to 64k. As it turns out, there actually are programs
Rik> using tens of thousands of VMAs.


Rik> Performance

Rik> Testing performance with a benchmark that allocates tens
Rik> of thousands of VMAs, unmaps them and mmaps them some more
Rik> in a loop, shows promising results.

How are the numbers for applications which only map a few VMAs?  Is
there any impact there?

Johannes did a test for that: https://lkml.org/lkml/2012/6/22/219

Some regression with such a workload is unavoidable, I expect.  We have
to work out whether the pros outweigh the cons.  This involves handwaving.

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