From: Wei Yang <richard.weiyang@gmail.com>
To: akpm@linux-foundation.org, mhocko@suse.com
Cc: mgorman@techsingularity.net, linux-mm@kvack.org,
Wei Yang <richard.weiyang@gmail.com>
Subject: [PATCH] mm, page_alloc: skip zone who has no managed_pages in calculate_totalreserve_pages()
Date: Mon, 12 Nov 2018 15:14:04 +0800 [thread overview]
Message-ID: <20181112071404.13620-1-richard.weiyang@gmail.com> (raw)
Zone with no managed_pages doesn't contribute totalreserv_pages. And the
more nodes we have, the more empty zones there are.
This patch skip the zones to save some cycles.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
mm/page_alloc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a919ba5cb3c8..567de15e1106 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7246,6 +7246,9 @@ static void calculate_totalreserve_pages(void)
struct zone *zone = pgdat->node_zones + i;
long max = 0;
+ if (!managed_zone(zone))
+ continue;
+
/* Find valid and maximum lowmem_reserve in the zone */
for (j = i; j < MAX_NR_ZONES; j++) {
if (zone->lowmem_reserve[j] > max)
--
2.15.1
next reply other threads:[~2018-11-12 7:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-12 7:14 Wei Yang [this message]
2018-11-12 8:09 ` Michal Hocko
2018-11-12 14:26 ` Wei Yang
2018-11-12 14:40 ` Michal Hocko
2018-11-13 1:39 ` Wei Yang
2018-11-13 8:08 ` Michal Hocko
2018-11-13 8:16 ` Wei Yang
2018-11-13 9:07 ` Michal Hocko
2018-11-13 9:14 ` Wei Yang
2018-11-14 7:43 ` Wei Yang
2018-11-14 7:48 ` Michal Hocko
2018-11-14 8:20 ` Wei Yang
2018-11-14 8:54 ` Michal Hocko
2018-11-13 3:11 ` [PATCH] mm, page_alloc: skip to set lowmem_reserve[] for empty zones Wei Yang
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