On some system, there are memory-less-nodes. (IOW, cpu-only-node)
Then,there are online nodes which has no memory.
Now, below code is used to detect the context where oom happens.
===
static inline int constrained_alloc(struct zonelist *zonelist, gfp_t gfp_mask)
{
#ifdef CONFIG_NUMA
struct zone **z;
nodemask_t nodes = node_online_map;
for (z = zonelist->zones; *z; z++)
if (cpuset_zone_allowed_softwall(*z, gfp_mask))
node_clear(zone_to_nid(*z), nodes);
else
return CONSTRAINT_CPUSET;
if (!nodes_empty(nodes))
return CONSTRAINT_MEMORY_POLICY;
#endif
return CONSTRAINT_NONE;
}
==
Because the zonelist never incldues memory-less-zone, above nodemask cannot be
empty if there is a memoly-less-node, never returns CONSTRAINT_NONE.
It looks select_bad_process() and panic_on_oom is checked only when
above function returns CONSTRAINT_NONE. This means current dies every time.
Does anyone have good idea for fix this ?
-Kame
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