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    SubjectRE: [PATCHv24 00/16] Contiguous Memory Allocator

    On Tuesday, April 10, 2012 7:20 PM Sandeep Patil wrote:

    > >> This is (yet another) update of CMA patches.
    > >
    > >
    > > How well CMA is supposed to work if you have mlocked processes? I've
    > > been testing these patches, and noticed that by creating a small mlocked
    > > process you start to get plenty of test_pages_isolated() failure warnings,
    > > and bigger allocations will always fail.
    > CMIIW, I think mlocked pages are never migrated. The reason is because
    > __isolate_lru_pages() does not isolate Unevictable pages right now.
    > Minchan added support to allow this but the patch was dropped.
    > See the discussion at :

    Right, we are aware of this limitation. We are working on solving it but we didn't
    consider it a blocker for the core CMA patches. Such issues can be easily fixed with
    the incremental patches.

    Best regards
    Marek Szyprowski
    Samsung Poland R&D Center

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