Date: Wed, 22 Jul 2009 12:52:23 -0500
From: "Serge E. Hallyn" <serue@us.ibm.com>
To: Oren Laadan <orenl@librato.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@osdl.org>,
       containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, linux-api@vger.kernel.org,
       Dave Hansen <dave@linux.vnet.ibm.com>, Ingo Molnar <mingo@elte.hu>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Alexander Viro <viro@zeniv.linux.org.uk>,
       Pavel Emelyanov <xemul@openvz.org>,
       Alexey Dobriyan <adobriyan@gmail.com>,
       Oren Laadan <orenl@cs.columbia.edu>
Subject: Re: [RFC v17][PATCH 22/60] c/r: external checkpoint of a task
	other than ourself
Message-ID: <20090722175223.GA19389@us.ibm.com>
References: <1248256822-23416-1-git-send-email-orenl@librato.com> <1248256822-23416-23-git-send-email-orenl@librato.com>
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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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