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| author | Wei Yang <richard.weiyang@gmail.com> | 2017-09-07 02:19:33 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-07 03:27:25 +0300 |
| commit | c11525830f92dea58353ace0f074ece5d9ef37c8 (patch) | |
| tree | 02b6f2a03dc2384e29a16994ff4eac22bb34a5f4 | |
| parent | 912d572d63b8cd19c303f357b627de492bd6bdef (diff) | |
| download | linux-c11525830f92dea58353ace0f074ece5d9ef37c8.tar.xz | |
mm/memory_hotplug: just build zonelist for newly added node
Commit 9adb62a5df9c ("mm/hotplug: correctly setup fallback zonelists
when creating new pgdat") tries to build the correct zonelist for a
newly added node, while it is not necessary to rebuild it for already
exist nodes.
In build_zonelists(), it will iterate on nodes with memory. For a newly
added node, it will have memory until node_states_set_node() is called
in online_pages().
This patch avoids rebuilding the zonelists for already existing nodes.
build_zonelists_node() uses managed_zone(zone) checks, so it should not
include empty zones anyway. So effectively we avoid some pointless work
under stop_machine().
[akpm@linux-foundation.org: tweak comment text]
[akpm@linux-foundation.org: coding-style tweak, per Vlastimil]
Link: http://lkml.kernel.org/r/20170626035822.50155-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Xishi Qiu <qiuxishi@huawei.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 | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9327a940e373..dcc8a1cf55b6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5282,14 +5282,18 @@ static int __build_all_zonelists(void *data) memset(node_load, 0, sizeof(node_load)); #endif + /* + * This node is hotadded and no memory is yet present. So just + * building zonelists is fine - no need to touch other nodes. + */ if (self && !node_online(self->node_id)) { build_zonelists(self); - } - - for_each_online_node(nid) { - pg_data_t *pgdat = NODE_DATA(nid); + } else { + for_each_online_node(nid) { + pg_data_t *pgdat = NODE_DATA(nid); - build_zonelists(pgdat); + build_zonelists(pgdat); + } } /* |