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    SubjectRe: Reducing inode cache usage on 2.4?
    James Pearson <> wrote:
    > It seems the inode cache has priority over cached file data.

    It does. If the machine is full of unmapped clean pagecache pages the
    kernel won't even try to reclaim inodes. This should help a bit:

    --- 24/mm/vmscan.c~a 2004-12-17 17:18:31.660254712 -0800
    +++ 24-akpm/mm/vmscan.c 2004-12-17 17:18:41.821709936 -0800
    @@ -659,13 +659,13 @@ int fastcall try_to_free_pages_zone(zone

    do {
    nr_pages = shrink_caches(classzone, gfp_mask, nr_pages, &failed_swapout);
    - if (nr_pages <= 0)
    - return 1;
    shrink_dcache_memory(vm_vfs_scan_ratio, gfp_mask);
    shrink_icache_memory(vm_vfs_scan_ratio, gfp_mask);
    #ifdef CONFIG_QUOTA
    shrink_dqcache_memory(vm_vfs_scan_ratio, gfp_mask);
    + if (nr_pages <= 0)
    + return 1;
    if (!failed_swapout)
    failed_swapout = !swap_out(classzone);
    } while (--tries);

    > What triggers the 'normal ageing round'? Is it possible to trigger this
    > earlier (at a lower memory usage), or give a higher priority to cached data?

    You could also try lowering /proc/sys/vm/vm_mapped_ratio. That will cause
    inodes to be reaped more easily, but will also cause more swapout.
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      Last update: 2005-03-22 14:08    [W:0.022 / U:38.192 seconds]
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