• Paul Jackson's avatar
    [PATCH] cpuset memory spread: slab cache filesystems · 4b6a9316
    Paul Jackson authored
    
    
    Mark file system inode and similar slab caches subject to SLAB_MEM_SPREAD
    memory spreading.
    
    If a slab cache is marked SLAB_MEM_SPREAD, then anytime that a task that's
    in a cpuset with the 'memory_spread_slab' option enabled goes to allocate
    from such a slab cache, the allocations are spread evenly over all the
    memory nodes (task->mems_allowed) allowed to that task, instead of favoring
    allocation on the node local to the current cpu.
    
    The following inode and similar caches are marked SLAB_MEM_SPREAD:
    
        file                               cache
        ====                               =====
        fs/adfs/super.c                    adfs_inode_cache
        fs/affs/super.c                    affs_inode_cache
        fs/befs/linuxvfs.c                 befs_inode_cache
        fs/bfs/inode.c                     bfs_inode_cache
        fs/block_dev.c                     bdev_cache
        fs/cifs/cifsfs.c                   cifs_inode_cache
        fs/coda/inode.c                    coda_inode_cache
        fs/dquot.c                         dquot
        fs/efs/super.c                     efs_inode_cache
        fs/ext2/super.c                    ext2_inode_cache
        fs/ext2/xattr.c (fs/mbcache.c)     ext2_xattr
        fs/ext3/super.c                    ext3_inode_cache
        fs/ext3/xattr.c (fs/mbcache.c)     ext3_xattr
        fs/fat/cache.c                     fat_cache
        fs/fat/inode.c                     fat_inode_cache
        fs/freevxfs/vxfs_super.c           vxfs_inode
        fs/hpfs/super.c                    hpfs_inode_cache
        fs/isofs/inode.c                   isofs_inode_cache
        fs/jffs/inode-v23.c                jffs_fm
        fs/jffs2/super.c                   jffs2_i
        fs/jfs/super.c                     jfs_ip
        fs/minix/inode.c                   minix_inode_cache
        fs/ncpfs/inode.c                   ncp_inode_cache
        fs/nfs/direct.c                    nfs_direct_cache
        fs/nfs/inode.c                     nfs_inode_cache
        fs/ntfs/super.c                    ntfs_big_inode_cache_name
        fs/ntfs/super.c                    ntfs_inode_cache
        fs/ocfs2/dlm/dlmfs.c               dlmfs_inode_cache
        fs/ocfs2/super.c                   ocfs2_inode_cache
        fs/proc/inode.c                    proc_inode_cache
        fs/qnx4/inode.c                    qnx4_inode_cache
        fs/reiserfs/super.c                reiser_inode_cache
        fs/romfs/inode.c                   romfs_inode_cache
        fs/smbfs/inode.c                   smb_inode_cache
        fs/sysv/inode.c                    sysv_inode_cache
        fs/udf/super.c                     udf_inode_cache
        fs/ufs/super.c                     ufs_inode_cache
        net/socket.c                       sock_inode_cache
        net/sunrpc/rpc_pipe.c              rpc_inode_cache
    
    The choice of which slab caches to so mark was quite simple.  I marked
    those already marked SLAB_RECLAIM_ACCOUNT, except for fs/xfs, dentry_cache,
    inode_cache, and buffer_head, which were marked in a previous patch.  Even
    though SLAB_RECLAIM_ACCOUNT is for a different purpose, it marks the same
    potentially large file system i/o related slab caches as we need for memory
    spreading.
    
    Given that the rule now becomes "wherever you would have used a
    SLAB_RECLAIM_ACCOUNT slab cache flag before (usually the inode cache), use
    the SLAB_MEM_SPREAD flag too", this should be easy enough to maintain.
    Future file system writers will just copy one of the existing file system
    slab cache setups and tend to get it right without thinking.
    Signed-off-by: default avatarPaul Jackson <pj@sgi.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    4b6a9316
super.c 102 KB