Quoting Oren Laadan (orenl@librato.com):

Now we can do "external" checkpoint, i.e. act on another task.

...

 long do_checkpoint(struct ckpt_ctx *ctx, pid_t pid)
 {
 	long ret;

+	ret = init_checkpoint_ctx(ctx, pid);
+	if (ret < 0)
+		return ret;
+
+	if (ctx->root_freezer) {
+		ret = cgroup_freezer_begin_checkpoint(ctx->root_freezer);
+		if (ret < 0)
+			return ret;
+	}

Self-checkpoint of a task in root freezer is now denied, though.

Was that intentional?

-serge

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