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    SubjectRe: The VFS cache is not freed when there is not enough free memory to allocate
    On 11/22/06, Peter Zijlstra <> wrote:
    > Mel's patches alone aren't quite enough, you also need some reclaim
    > modifications, I'll ping Andy to see how far he's on that.

    I think so. A quick look at Mei's patch, I found the patch can't help our case.
    The current situation is that the application need 8 M memory, but
    ther is only 5M free memory, cached memory eat almost 40Mbyte. When
    the application is requesting the memory, kernel just report failure,
    not attempt to release the VFS cache and try it again.
    root:/mnt> cat /proc/meminfo
    MemTotal: 54196 kB
    MemFree: 5520 kB <== only 5M free
    Buffers: 76 kB
    Cached: 44696 kB <== cache eat 40MB
    SwapCached: 0 kB
    Active: 21092 kB
    Inactive: 23680 kB
    HighTotal: 0 kB
    HighFree: 0 kB
    LowTotal: 54196 kB
    LowFree: 5520 kB
    SwapTotal: 0 kB
    SwapFree: 0 kB
    Dirty: 0 kB
    Writeback: 0 kB
    AnonPages: 0 kB
    Mapped: 0 kB
    Slab: 3720 kB
    PageTables: 0 kB
    NFS_Unstable: 0 kB
    Bounce: 0 kB
    CommitLimit: 27096 kB
    Committed_AS: 0 kB
    VmallocTotal: 0 kB
    VmallocUsed: 0 kB
    VmallocChunk: 0 kB

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      Last update: 2006-11-22 12:13    [W:0.021 / U:40.624 seconds]
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