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    SubjectRe: WARNING: at mm/page_alloc.c:1159 get_page_from_freelist+0x325/0x655()
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    On Wed, 2009-06-17 at 13:28 +0100, Mel Gorman wrote:
    > On Wed, Jun 17, 2009 at 01:11:17PM +0100, Catalin Marinas wrote:
    > > On Wed, 2009-06-17 at 13:31 +0200, Ingo Molnar wrote:
    > > > a new warning started popping up today, in the new page allocator
    > > > code. The allocation came from kmemleak:
    > > >
    > > > WARNING: at mm/page_alloc.c:1159 get_page_from_freelist+0x325/0x655()
    > > > Hardware name: System Product Name
    > > > Modules linked in:
    > > > Pid: 4367, comm: ifup Not tainted 2.6.30-tip-04303-g5ada65e-dirty #54431
    > > > Call Trace:
    > > > [<ffffffff810dba73>] ? get_page_from_freelist+0x325/0x655
    > > > [<ffffffff8106f140>] warn_slowpath_common+0x88/0xcb
    > > > [<ffffffff8106f1a5>] warn_slowpath_null+0x22/0x38
    > > > [<ffffffff810dba73>] get_page_from_freelist+0x325/0x655
    > > > [<ffffffff810dc18c>] __alloc_pages_nodemask+0x14c/0x5b0
    > > > [<ffffffff811063e1>] ? deactivate_slab+0xce/0x16b
    > > > [<ffffffff8103b1c8>] ? native_sched_clock+0x40/0x79
    > > > [<ffffffff811063e1>] ? deactivate_slab+0xce/0x16b
    > > > [<ffffffff811063e1>] ? deactivate_slab+0xce/0x16b
    > > > [<ffffffff81102417>] alloc_pages_current+0xcc/0xeb
    > > > [<ffffffff81107a78>] alloc_slab_page+0x2a/0x7e
    > > > [<ffffffff81107b27>] new_slab+0x5b/0x210
    > > > [<ffffffff811063fa>] ? deactivate_slab+0xe7/0x16b
    > > > [<ffffffff81108253>] __slab_alloc+0x214/0x3da
    > > > [<ffffffff8110f58d>] ? kmemleak_alloc+0x83/0x35a
    > > > [<ffffffff8110f58d>] ? kmemleak_alloc+0x83/0x35a
    > > > [<ffffffff8110863c>] kmem_cache_alloc+0xac/0x14e
    > > > [<ffffffff8110f58d>] kmemleak_alloc+0x83/0x35a
    > > > [<ffffffff812b6436>] ? cfq_get_queue+0x101/0x231
    > > > [<ffffffff81108511>] kmem_cache_alloc_node+0xf8/0x177
    > > > [<ffffffff812b6436>] ? cfq_get_queue+0x101/0x231
    > > > [<ffffffff812b6436>] cfq_get_queue+0x101/0x231
    > >
    > > Kmemleak needs to allocate memory for the pointer tracing and it
    > > currently passes the same gfp flags as those used by the original
    > > caller. In this case cfq_find_alloc_queue uses __GFP_NOFAIL.
    > >
    > > The reason for this was to avoid GFP_ATOMIC if the caller wasn't
    > > requiring it. I think the approach below is better:
    > >
    >
    > How about defining a GFP_SLAB_KMEMLEAK_MASK the subset of flags that kmemleak
    > should use? Based on this patch, the following appears to be it's definition.
    >
    > __GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGH

    Do you mean defining one in the gfp.h file? I think this would be better
    placed in the kmemleak.c file as no other part of Linux would be using
    it.

    I personally find defining the GFP_KMEMLEAK_MASK as (GFP_KERNEL |
    GFP_ATOMIC) more readable than using the individual bits since this
    states clearly what type of allocations would be allowed (and safer if
    someone later decides to improve the GFP_KERNEL or GFP_ATOMIC
    definitions).

    --
    Catalin



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