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x86: stop nmi softlockup warnings in show_mem() 

When dumping memory via sysrq-m it is possible to take a bogus NMI
watchdog or softlockup watchdog because the dump can take a long time on
big memory systems.

Occasionally tickle the watchdog when doing the dump.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Prarit Bhargava 2007-10-17 18:04:34 +02:00 committed by Thomas Gleixner
parent 509a80c49c
commit 27eb0b288f
1 changed files with 3 additions and 0 deletions
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3
arch/x86/mm/pgtable_32.c
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@ -6,6 +6,7 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/nmi.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/highmem.h>
@ -39,6 +40,8 @@ void show_mem(void)
for_each_online_pgdat(pgdat) {
pgdat_resize_lock(pgdat, &flags);
for (i = 0; i < pgdat->node_spanned_pages; ++i) {
if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
touch_nmi_watchdog();
page = pgdat_page_nr(pgdat, i);
total++;
if (PageHighMem(page))