lkml.org 
[lkml]   [2007]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: O_DIRECT question
    On Thu, 11 Jan 2007 13:50:53 +0800
    Aubrey <aubreylee@gmail.com> 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
    well.

    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.
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-01-11 07:45    [W:0.020 / U:150.272 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site