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mm, oom: ensure memoryless node zonelist always includes zones

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With memoryless node support being worked on, it's possible that for
optimizations that a node may not have a non-NULL zonelist.  When
CONFIG_NUMA is enabled and node 0 is memoryless, this means the zonelist
for first_online_node may become NULL.

The oom killer requires a zonelist that includes all memory zones for
the sysrq trigger and pagefault out of memory handler.

Ensure that a non-NULL zonelist is always passed to the oom killer.

[[email protected]: fix non-numa build]
Signed-off-by: David Rientjes <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Rientjes 2014-08-06 16:07:50 -07:00 • committed by Linus Torvalds
commit 8d060bf490
3 changed files with 12 additions and 3 deletions
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2
mm/oom_kill.c
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@ -694,7 +694,7 @@ void pagefault_out_of_memory(void)
if (mem_cgroup_oom_synchronize(true))
return;
zonelist = node_zonelist(first_online_node, GFP_KERNEL);
zonelist = node_zonelist(first_memory_node, GFP_KERNEL);
if (try_set_zonelist_oom(zonelist, GFP_KERNEL)) {
out_of_memory(NULL, 0, 0, NULL, false);
clear_zonelist_oom(zonelist, GFP_KERNEL);