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    SubjectRe: O_DIRECT question
    On Thu, 11 Jan 2007 13:50:53 +0800
    Aubrey <> wrote:

    > Firstly I want to say I'm working on no-mmu arch and uClinux.
    > After much of file operations VFS cache eat up all of the memory.
    > At this time, if an application request memory which order > 3, the
    > kernel will report failure.

    nommu kernels should probably run reclaim for higher-order allocations as

    That's rather a blunt instrument. The "lumpy reclaim" patches in -mm
    provide a much better approach, but they need more work yet (although I
    don't immediately recall what's needed).

    In the interim you could do the old "echo 3 > /proc/sys/vm/drop_caches"
    thing, but that's terribly crude - drop_caches is really only for debugging
    and benchmarking.
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