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    Subject[PATCH] [45/48] x86_64: Inhibit machine from asserting an NMI when doing Alt-SysRq-M operation.
    Date

    From: Konrad Rzeszutek <konrad@darnok.org>
    This patch touches the NMI watchdog every MAX_ORDER_NR_PAGES
    to inhibit the machine from triggering an NMI while the CPUs
    are locked. This situation is happening on boxes with more
    than 64CPUs and 128GB of RAM when Alt-SysRq-m is performed.

    It has been succesfully tested for regression on uni, 2, 4, 8
    32, and 64 CPU boxes with various memory configuration.

    Signed-off-by: Andi Kleen <ak@suse.de>

    ---
    arch/x86_64/mm/init.c | 6 ++++++
    1 file changed, 6 insertions(+)

    Index: linux/arch/x86_64/mm/init.c
    ===================================================================
    --- linux.orig/arch/x86_64/mm/init.c
    +++ linux/arch/x86_64/mm/init.c
    @@ -27,6 +27,7 @@
    #include <linux/dma-mapping.h>
    #include <linux/module.h>
    #include <linux/memory_hotplug.h>
    +#include <linux/nmi.h>

    #include <asm/processor.h>
    #include <asm/system.h>
    @@ -73,6 +74,11 @@ void show_mem(void)

    for_each_online_pgdat(pgdat) {
    for (i = 0; i < pgdat->node_spanned_pages; ++i) {
    + /* this loop can take a while with 256 GB and 4k pages
    + so update the NMI watchdog */
    + if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) {
    + touch_nmi_watchdog();
    + }
    page = pfn_to_page(pgdat->node_start_pfn + i);
    total++;
    if (PageReserved(page))
    -
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