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    SubjectRe: mapped pagecache pages vs unmapped pages
    On 04/06/2012 08:29 AM, Alexey Ivanov wrote:

    > In progress of migration from FreeBSD to Linux and we found some strange behavior: periodically running tasks (like rsync/p2p deployment) evict mapped pages from memory.
    > From my little research I've found following lkml thread:
    > And more precisely this commit:;a=commit;h=4f98a2fee8acdb4ac84545df98cccecfd130f8db
    > which along with splitting LRU into "anon" and "file" removed support of reclaim_mapped.
    > Is there a knob to prioritize mapped memory over unmapped (without modifying all apps to use O_DIRECT/fadvise/madvise or mlocking our data in memory) or at least some way to change proportion of Active(file)/Inactive(file)?

    Hi Alexey,

    Cc to linux-mm mailing list.

    I have met the similar problem and I have sent a mail to discuss it.
    Maybe it can help you

    Now Konstantin has sent a patch set to try to expand vm_flags from 32
    bit to 64 bit. Then we can add the new flag into vm_flags and
    prioritize mmaped pages in madvise(2).


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