The patch titled
Inhibit NMI watchdog when Alt-SysRq-T operation is underway
has been added to the -mm tree. Its filename is
inhibit-nmi-watchdog-when-alt-sysrq-t-operation-is-underway.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Inhibit NMI watchdog when Alt-SysRq-T operation is underway
From: Konrad Rzeszutek <konrad@xxxxxxxxxx>
On large memory configuration with not so fast CPUs the NMI watchdog is
triggered when memory addresses are being gathered and printed. The code
paths for Alt-SysRq-t are sprinkled with touch_nmi_watchdog in various
places but not in this routine (or in the loop that utilizes this
function). The patch has been tested for regression on large CPU+memory
configuration (128 logical CPUs + 224 GB) and 1,2,4,16-CPU sockets with
various memory sizes (1,2,4,6,20).
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86_64/kernel/traps.c | 1 +
1 files changed, 1 insertion(+)
diff -puN arch/x86_64/kernel/traps.c~inhibit-nmi-watchdog-when-alt-sysrq-t-operation-is-underway arch/x86_64/kernel/traps.c
--- a/arch/x86_64/kernel/traps.c~inhibit-nmi-watchdog-when-alt-sysrq-t-operation-is-underway
+++ a/arch/x86_64/kernel/traps.c
@@ -397,6 +397,7 @@ static int print_trace_stack(void *data,
static void print_trace_address(void *data, unsigned long addr)
{
+ touch_nmi_watchdog();
printk_address(addr);
}
_
Patches currently in -mm which might be from konrad@xxxxxxxxxx are
inhibit-nmi-watchdog-when-alt-sysrq-t-operation-is-underway.patch
i386-speedup-touch_nmi_watchdog.patch
x86_64-speedup-touch_nmi_watchdog.patch
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