Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1c978b93 authored by Konrad Rzeszutek's avatar Konrad Rzeszutek Committed by Linus Torvalds
Browse files

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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2a41de48

arch/x86_64/kernel/traps.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

}