linux-kernel - Re: [RFC v17][PATCH 22/60] c/r: external checkpoint of a task other than ourself

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Message-ID: <20090722175223.GA19389@us.ibm.com>
Date:	Wed, 22 Jul 2009 12:52:23 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Oren Laadan <orenl@...rato.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...l.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org, Dave Hansen <dave@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Oren Laadan <orenl@...columbia.edu>
Subject: Re: [RFC v17][PATCH 22/60] c/r: external checkpoint of a task
	other than ourself

Quoting Oren Laadan (orenl@...rato.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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