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| author | Michal Hocko <mhocko@suse.com> | 2017-09-07 02:20:20 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-07 03:27:25 +0300 |
| commit | d9c9a0b9729c35c96ef7bee4ded56d9441bebd58 (patch) | |
| tree | 35f4cfc9b87e72b5a571af0be3fd49ec6012763d | |
| parent | afb6ebb3faeb382f7c8b4478f2a84cee37bb8610 (diff) | |
| download | linux-d9c9a0b9729c35c96ef7bee4ded56d9441bebd58.tar.xz | |
mm, page_alloc: do not set_cpu_numa_mem on empty nodes initialization
__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.
Link: http://lkml.kernel.org/r/20170721143915.14161-4-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/page_alloc.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 94e64784a8be..94fb4370e000 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5160,10 +5160,8 @@ 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. @@ -5172,10 +5170,10 @@ 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; } |