linux-kernel - Re: [RFC v12][PATCH 13/14] Checkpoint multiple processes

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Message-ID: <496E206A.6020003@cs.columbia.edu>
Date:	Wed, 14 Jan 2009 12:27:06 -0500
From:	Oren Laadan <orenl@...columbia.edu>
To:	Nathan Lynch <ntl@...ox.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, Thomas Gleixner <tglx@...utronix.de>,
	Serge Hallyn <serue@...ibm.com>,
	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>,
	Mike Waychison <mikew@...gle.com>
Subject: Re: [RFC v12][PATCH 13/14] Checkpoint multiple processes



Nathan Lynch wrote:
>> +/* count number of tasks in tree (and optionally fill pid's in array) */
>> +static int cr_tree_count_tasks(struct cr_ctx *ctx)
>> +{
>> +	struct task_struct *root = ctx->root_task;
>> +	struct task_struct *task = root;
>> +	struct task_struct *parent = NULL;
>> +	struct task_struct **tasks_arr = ctx->tasks_arr;
>> +	int tasks_nr = ctx->tasks_nr;
>> +	int nr = 0;
>> +
>> +	read_lock(&tasklist_lock);
>> +
>> +	/* count tasks via DFS scan of the tree */
>> +	while (1) {
>> +		if (tasks_arr) {
>> +			/* unlikely, but ... */
>> +			if (nr == tasks_nr)
>> +				return -EBUSY;	/* cleanup in cr_ctx_free() */
> 
> Returns without unlocking tasklist_lock?
> 

Thanks. Will fix.

Oren.
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