mm/vmstat.c: do not show lowmem reserve protection information of empty zone (26e7dead) · Commits · 戴 / test

Because the lowmem reserve protection of a zone can't tell anything if the zone is empty, except of adding one more line in /proc/zoneinfo. Let's remove it from that zone's showing. Signed-off-by:

Baoquan He <bhe@redhat.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20200402140113.3696-4-bhe@redhat.com Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

mm/vmstat.c

+6 −6

Original line number	Diff line number	Diff line
		@@ -1592,6 +1592,12 @@ static void zoneinfo_show_print(struct seq_file m, pg_data_t pgdat,
		zone->present_pages,
		zone_managed_pages(zone));

		/* If unpopulated, no other information is useful */
		if (!populated_zone(zone)) {
		seq_putc(m, '\n');
		return;
		}

		seq_printf(m,
		"\n protection: (%ld",
		zone->lowmem_reserve[0]);
		@@ -1599,12 +1605,6 @@ static void zoneinfo_show_print(struct seq_file m, pg_data_t pgdat,
		seq_printf(m, ", %ld", zone->lowmem_reserve[i]);
		seq_putc(m, ')');

		/* If unpopulated, no other information is useful */
		if (!populated_zone(zone)) {
		seq_putc(m, '\n');
		return;
		}

		for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
		seq_printf(m, "\n %-12s %lu", zone_stat_name(i),
		zone_page_state(zone, i));

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