On Tue, 13 Mar 2012 12:37:06 +0530
"Aneesh Kumar K.V" [off-list ref] wrote:

+static int mem_cgroup_hugetlb_usage(struct mem_cgroup *memcg)
+{
+	int idx;
+	for (idx = 0; idx < hugetlb_max_hstate; idx++) {
+		if (memcg->hugepage[idx].usage > 0)
+			return memcg->hugepage[idx].usage;
+	}
+	return 0;
+}

Please document the function?  Had you done this, I might have been
able to work out why the function bales out on the first used hugepage
size, but I can't :(

This could have used for_each_hstate(), had that macro been better
designed (or updated).

Upon return this function coerces an unsigned long long into an "int". 
We decided last week that more than 2^32 hugepages was not
inconceivable, so I guess that's a bug.

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