lkml.org 
[lkml]   [2007]   [Jul]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
SubjectRe: [PATCH] Inhibit NMI watchdog when Alt-SysRq-T operation is underway.
On Mon, Jul 09, 2007 at 10:02:42AM -0400, Konrad Rzeszutek wrote:
> 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).

And the patch:

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index aac1c0b..b6e7d67 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -330,6 +330,10 @@ static int print_trace_stack(void *data,

static void print_trace_address(void *data, unsigned long addr)
{
+ static int i = 0;
+ if (i && ((i % 8) == 0))
+ touch_nmi_watchdog();
+ i++;
printk_address(addr);
}

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2007-07-09 17:57    [W:0.046 / U:0.892 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site