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Commit 27eb0b28 authored by Prarit Bhargava's avatar Prarit Bhargava Committed by Thomas Gleixner
Browse files

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: default avatarPrarit Bhargava <prarit@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 509a80c4

arch/x86/mm/pgtable_32.c

+3 −0
Original line number Diff line number Diff line
@@ -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))