From 1c978b935e81da9434342f0bc8263c6cfe1214ce Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek <konrad@darnok.org>
Date: Tue, 17 Jul 2007 04:03:56 -0700
Subject: [PATCH] Inhibit NMI watchdog when Alt-SysRq-T operation is underway
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@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/x86_64/kernel/traps.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 6963b64a76cae..74cbeb2e99a63 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -330,6 +330,7 @@ static int print_trace_stack(void *data, char *name)
static void print_trace_address(void *data, unsigned long addr)
{
+ touch_nmi_watchdog();
printk_address(addr);
}
--
2.30.2