lkml.org 
[lkml]   [2017]   [Jul]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/9] mm, page_alloc: do not set_cpu_numa_mem on empty nodes initialization
Date
From: Michal Hocko <mhocko@suse.com>

__build_all_zonelists reinitializes each online cpu local node for
CONFIG_HAVE_MEMORYLESS_NODES. This makes sense because previously memory
less nodes could gain some memory during memory hotplug and so the local
node should be changed for CPUs close to such a node. It makes less
sense to do that unconditionally for a newly creaded NUMA node which is
still offline and without any memory.

Let's also simplify the cpu loop and use for_each_online_cpu instead of
an explicit cpu_online check for all possible cpus.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
mm/page_alloc.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7746824a425d..ebc3311555b1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5096,10 +5096,8 @@ static int __build_all_zonelists(void *data)

build_zonelists(pgdat);
}
- }

#ifdef CONFIG_HAVE_MEMORYLESS_NODES
- for_each_possible_cpu(cpu) {
/*
* We now know the "local memory node" for each node--
* i.e., the node of the first zone in the generic zonelist.
@@ -5108,10 +5106,10 @@ static int __build_all_zonelists(void *data)
* secondary cpus' numa_mem as they come on-line. During
* node/memory hotplug, we'll fixup all on-line cpus.
*/
- if (cpu_online(cpu))
+ for_each_online_cpu(cpu)
set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu)));
- }
#endif
+ }

return 0;
}
--
2.11.0
\
 
 \ /
  Last update: 2017-07-14 10:03    [W:0.962 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site