lkml.org 
[lkml]   [2004]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[PATCH] shrink hash sizes on small machines, take 2
    The following attempts to cleanly address the low end of the problem,
    something like my calc_hash_order or Marcelo's approach should be used
    to attack the upper end of the problem.

    8<

    Shrink hashes on small systems

    Base hash sizes on available memory rather than total memory. An
    additional 50% above current used memory is considered reserved for
    the purposes of hash sizing to compensate for the hashes themselves
    and the remainder of kernel and userspace initialization.

    Index: tiny/fs/dcache.c
    ===================================================================
    --- tiny.orig/fs/dcache.c 2004-03-25 13:36:09.000000000 -0600
    +++ tiny/fs/dcache.c 2004-04-10 18:14:42.000000000 -0500
    @@ -28,6 +28,7 @@
    #include <asm/uaccess.h>
    #include <linux/security.h>
    #include <linux/seqlock.h>
    +#include <linux/swap.h>

    #define DCACHE_PARANOIA 1
    /* #define DCACHE_DEBUG 1 */
    @@ -1619,13 +1620,21 @@

    void __init vfs_caches_init(unsigned long mempages)
    {
    - names_cachep = kmem_cache_create("names_cache",
    - PATH_MAX, 0,
    + unsigned long reserve;
    +
    + /* Base hash sizes on available memory, with a reserve equal to
    + 150% of current kernel size */
    +
    + reserve = (mempages - nr_free_pages()) * 3/2;
    + mempages -= reserve;
    +
    + names_cachep = kmem_cache_create("names_cache",
    + PATH_MAX, 0,
    SLAB_HWCACHE_ALIGN, NULL, NULL);
    if (!names_cachep)
    panic("Cannot create names SLAB cache");

    - filp_cachep = kmem_cache_create("filp",
    + filp_cachep = kmem_cache_create("filp",
    sizeof(struct file), 0,
    SLAB_HWCACHE_ALIGN, filp_ctor, filp_dtor);
    if(!filp_cachep)
    @@ -1633,7 +1642,7 @@

    dcache_init(mempages);
    inode_init(mempages);
    - files_init(mempages);
    + files_init(mempages);
    mnt_init(mempages);
    bdev_cache_init();
    chrdev_init();
    --
    Matt Mackall : http://www.selenic.com : Linux development and consulting
    -
    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: 2005-03-22 14:02    [W:0.023 / U:0.428 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site