On Fri, 22 Jun 2012 10:24:58 -0400 "John Stoffel" <john@xxxxxxxxxxx> wrote: > >>>>> "Rik" == Rik van Riel <riel@xxxxxxxxxxx> 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>