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    SubjectRe: kmemleak, cpu usage jump out of nowhere
    it seems that you are using 32bit kernel. please check if this one help.

    Thanks

    Yinghai

    Subject: [PATCH -v3] x86,mm: fix 32bit numa sparsemem

    Borislav Petkov <borislav.petkov@amd.com> reported his 32bit numa has problem:

    [ 0.000000] Reserving total of 4c00 pages for numa KVA remap
    [ 0.000000] kva_start_pfn ~ 32800 max_low_pfn ~ 375fe
    [ 0.000000] max_pfn = 238000
    [ 0.000000] 8202MB HIGHMEM available.
    [ 0.000000] 885MB LOWMEM available.
    [ 0.000000] mapped low ram: 0 - 375fe000
    [ 0.000000] low ram: 0 - 375fe000
    [ 0.000000] alloc (nid=8 100000 - 7ee00000) (1000000 - ffffffff) 1000 1000 => 34e7000
    [ 0.000000] alloc (nid=8 100000 - 7ee00000) (1000000 - ffffffff) 200 40 => 34c9d80
    [ 0.000000] alloc (nid=0 100000 - 7ee00000) (1000000 - ffffffffffffffff) 180 40 => 34e6140
    [ 0.000000] alloc (nid=1 80000000 - c7e60000) (1000000 - ffffffffffffffff) 240 40 => 80000000
    [ 0.000000] BUG: unable to handle kernel paging request at 40000000
    [ 0.000000] IP: [<c2c8cff1>] __alloc_memory_core_early+0x147/0x1d6
    [ 0.000000] *pdpt = 0000000000000000 *pde = f000ff53f000ff00
    ...
    [ 0.000000] Call Trace:
    [ 0.000000] [<c2c8b4f8>] ? __alloc_bootmem_node+0x216/0x22f
    [ 0.000000] [<c2c90c9b>] ? sparse_early_usemaps_alloc_node+0x5a/0x10b
    [ 0.000000] [<c2c9149e>] ? sparse_init+0x1dc/0x499
    [ 0.000000] [<c2c79118>] ? paging_init+0x168/0x1df
    [ 0.000000] [<c2c780ff>] ? native_pagetable_setup_start+0xef/0x1bb
    looks like it allocate much high address for bootmem.

    try to cut limit with get_max_mapped()

    -v3: make alloc_bootmem_node could fallback to other node.
    just like old alloc_bootmem_node did

    need this patch for 2.6.34 and 2.6.35

    Reported-by: Borislav Petkov <borislav.petkov@amd.com>
    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    Cc: stable@kernel.org

    ---
    mm/bootmem.c | 24 ++++++++++++++++++++----
    mm/page_alloc.c | 3 +++
    2 files changed, 23 insertions(+), 4 deletions(-)
    Index: linux-2.6/mm/page_alloc.c
    ===================================================================
    --- linux-2.6.orig/mm/page_alloc.c
    +++ linux-2.6/mm/page_alloc.c
    @@ -3634,6 +3634,9 @@ void * __init __alloc_memory_core_early(
    int i;
    void *ptr;

    + if (limit > get_max_mapped())
    + limit = get_max_mapped();
    +
    /* need to go over early_node_map to find out good range for node */
    for_each_active_range_index_in_nid(i, nid) {
    u64 addr;
    Index: linux-2.6/mm/bootmem.c
    ===================================================================
    --- linux-2.6.orig/mm/bootmem.c
    +++ linux-2.6/mm/bootmem.c
    @@ -833,15 +833,24 @@ static void * __init ___alloc_bootmem_no
    void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
    unsigned long align, unsigned long goal)
    {
    + void *ptr;
    +
    if (WARN_ON_ONCE(slab_is_available()))
    return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

    #ifdef CONFIG_NO_BOOTMEM
    - return __alloc_memory_core_early(pgdat->node_id, size, align,
    + ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
    + goal, -1ULL);
    + if (ptr)
    + return ptr;
    +
    + ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
    goal, -1ULL);
    #else
    - return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
    + ptr = ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
    #endif
    +
    + return ptr;
    }

    void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
    @@ -977,14 +986,21 @@ void * __init __alloc_bootmem_low(unsign
    void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
    unsigned long align, unsigned long goal)
    {
    + void *ptr;
    +
    if (WARN_ON_ONCE(slab_is_available()))
    return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);

    #ifdef CONFIG_NO_BOOTMEM
    - return __alloc_memory_core_early(pgdat->node_id, size, align,
    + ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
    + goal, ARCH_LOW_ADDRESS_LIMIT);
    + if (ptr)
    + return ptr;
    + ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
    goal, ARCH_LOW_ADDRESS_LIMIT);
    #else
    - return ___alloc_bootmem_node(pgdat->bdata, size, align,
    + ptr = ___alloc_bootmem_node(pgdat->bdata, size, align,
    goal, ARCH_LOW_ADDRESS_LIMIT);
    #endif
    + return ptr;
    }

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