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    SubjectRe: huge debug_objects_cache. swapping but 25% mem free
    On Wed, 1 Feb 2012 19:29:32 +0100
    Johannes Stezenbach <js@sig21.net> wrote:

    > On Mon, Jan 30, 2012 at 04:40:48PM +0100, Johannes Stezenbach wrote:
    > >
    > > According to slabtop debug_objects_cache eats half the
    > > memory, is this expected? The Kconfig help text does not
    > > suggest it.
    >
    > FWIW, today after running full backup using rsync:
    >
    > OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
    > 4025450 4025447 99% 0.36K 183977 22 1471816K debug_objects_cache
    > 170266 87241 51% 1.74K 9645 18 308640K ext3_inode_cache
    > 54855 40215 73% 0.58K 2034 27 32544K dentry
    > 38124 12474 32% 0.42K 2119 18 16952K buffer_head
    > 17794 17464 98% 0.51K 574 31 9184K sysfs_dir_cache
    > 11434 8494 74% 0.87K 713 18 11408K radix_tree_node
    > 11400 5570 48% 0.38K 570 20 4560K kmalloc-64
    >
    > /sys/kernel/debug/debug_objects/stats:
    > max_chain :870
    > warnings :0
    > fixups :0
    > pool_free :258
    > pool_min_free :252
    > pool_used :4025193
    > pool_max_used :4025195
    >
    >
    > then after "echo 3 >/proc/sys/vm/drop_caches":
    >
    > OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
    > 4030488 4030485 99% 0.36K 184206 22 1473648K debug_objects_cache
    > 17955 9071 50% 0.58K 665 27 10640K dentry
    > 17763 17455 98% 0.51K 573 31 9168K sysfs_dir_cache
    > 9408 9156 97% 0.33K 392 24 3136K kmalloc-8
    >
    >
    > I'm still not sure if this is normal behaviour of DEBUG_OBJECTS or a bug?

    Bug. It appears that you hadn't been using CONFIG_DEBUG_OBJECTS before
    3.2 so we don't know if it is a regression.



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