linux-kernel - Re: [PATCH] mm, sched, numa: Create a per-task MPOL

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Message-ID: <20130826161457.GB10002@twins.programming.kicks-ass.net>
Date:	Mon, 26 Aug 2013 18:14:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm, sched, numa: Create a per-task MPOL_INTERLEAVE policy

On Mon, Aug 26, 2013 at 06:10:27PM +0200, Peter Zijlstra wrote:
> +	if (pol == new) {
> +		/*
> +		 * XXX 'borrowed' from do_set_mempolicy()

This should probably also say something like:

 /*
  * This is safe without holding mm->mmap_sem for show_numa_map()
  * because this is only used for a NULL->pol transition, not
  * pol1->pol2 transitions.
  */

> +		 */
> +		pol->v.nodes = nodes;
> +		p->mempolicy = pol;
> +		p->flags |= PF_MEMPOLICY;
> +		p->il_next = first_node(nodes);
> +		new = NULL;
> +	} else {
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