linux-kernel - Re: [RFC v9][PATCH 12/13] Checkpoint multiple processes

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Message-ID: <20081114034130.GA14171@us.ibm.com>
Date:	Thu, 13 Nov 2008 21:41:30 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Oren Laadan <orenl@...columbia.edu>
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, Thomas Gleixner <tglx@...utronix.de>,
	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>
Subject: Re: [RFC v9][PATCH 12/13] Checkpoint multiple processes

Quoting Oren Laadan (orenl@...columbia.edu):
> Checkpointing of multiple processes works by recording the tasks tree
> structure below a given task (usually this task is the container init).
> 
> For a given task, do a DFS scan of the tasks tree and collect them
> into an array (keeping a reference to each task). Using DFS simplifies
> the recreation of tasks either in user space or kernel space. For each
> task collected, test if it can be checkpointed, and save its pid, tgid,
> and ppid.
> 
> The actual work is divided into two passes: a first scan counts the
> tasks, then memory is allocated and a second scan fills the array.
> 
> The logic is suitable for creation of processes during restart either
> in userspace or by the kernel.
> 
> Currently we ignore threads and zombies, as well as session ids.
> 
> Signed-off-by: Oren Laadan <orenl@...columbia.edu>

Looks good.

Acked-by: Serge Hallyn <serue@...ibm.com>

thanks,
-serge
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