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From: Christoph Lameter <clameter@sgi.com>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Paul Jackson <pj@sgi.com>, David Rientjes <rientjes@google.com>,
	Mel Gorman <mel@csn.ul.ie>,
	torvalds@linux-foundation.org, Eric Whitney <eric.whitney@hp.com>
Subject: Re: [2.6.24 regression][BUGFIX] numactl --interleave=all doesn't works on memoryless node.
Date: Tue, 5 Feb 2008 14:12:11 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802051406500.14665@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <1202248652.5332.51.camel@localhost>

On Tue, 5 Feb 2008, Lee Schermerhorn wrote:

> mbind(2), on the other hand, just masks off any nodes in the 
> nodemask that are not included in the caller's mems_allowed.

Ok so we temporarily adopt these semantics for set_mempolicy.

> 1) modify contextualize_policy to just remove the non-allowed
>    nodes, as is currently done in-line for mbind().  This
>    guarantees that the resulting mask includes only nodes with
>    memory.

Right make ssense. we already contextualize for cpusets.

> Index: Linux/mm/mempolicy.c
> ===================================================================
> --- Linux.orig/mm/mempolicy.c	2008-02-05 11:25:17.000000000 -0500
> +++ Linux/mm/mempolicy.c	2008-02-05 16:03:11.000000000 -0500
> @@ -131,7 +131,7 @@ static int mpol_check_policy(int mode, n
>  			return -EINVAL;
>  		break;
>  	}
> - 	return nodes_subset(*nodes, node_states[N_HIGH_MEMORY]) ? 0 : -EINVAL;
> + 	return 0;
>  }

Hmmm... That is a pretty drastic change.

> @@ -188,8 +188,6 @@ static struct mempolicy *mpol_new(int mo
>  	switch (mode) {
>  	case MPOL_INTERLEAVE:
>  		policy->v.nodes = *nodes;
> -		nodes_and(policy->v.nodes, policy->v.nodes,
> -					node_states[N_HIGH_MEMORY]);
>  		if (nodes_weight(policy->v.nodes) == 0) {
>  			kmem_cache_free(policy_cache, policy);
>  			return ERR_PTR(-EINVAL);

Do we really need to remove these lines if we change set_mempolicy?

> @@ -426,9 +424,13 @@ static int contextualize_policy(int mode
>  	if (!nodes)
>  		return 0;
>  
> +	/*
> +	 * Restrict the nodes to the allowed nodes in the cpuset.
> +	 * This is guaranteed to be a subset of nodes with memory.
> +	 */
>  	cpuset_update_task_memory_state();
> -	if (!cpuset_nodes_subset_current_mems_allowed(*nodes))
> -		return -EINVAL;
> +	nodes_and(*nodes, *nodes, cpuset_current_mems_allowed);
> +
>  	return mpol_check_policy(mode, nodes);
>  }
>  

Ditto?

> @@ -797,7 +799,7 @@ static long do_mbind(unsigned long start
>  	if (end == start)
>  		return 0;
>  
> -	if (mpol_check_policy(mode, nmask))
> +	if (contextualize_policy(mode, nmask))
>  		return -EINVAL;
>  
>  	new = mpol_new(mode, nmask);
> @@ -915,10 +917,6 @@ asmlinkage long sys_mbind(unsigned long 
>  	err = get_nodes(&nodes, nmask, maxnode);
>  	if (err)
>  		return err;
> -#ifdef CONFIG_CPUSETS
> -	/* Restrict the nodes to the allowed nodes in the cpuset */
> -	nodes_and(nodes, nodes, current->mems_allowed);
> -#endif

Would just removing #ifdef CONFIG_CPUSETS work? mems_allowed falls back to 
node_possible_map.... Shouldnt that be node_online_map?


  reply	other threads:[~2008-02-05 22:12 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-02  8:12 [2.6.24-rc8-mm1][regression?] " KOSAKI Motohiro
2008-02-02  9:09 ` Andi Kleen
2008-02-02  9:37   ` KOSAKI Motohiro
2008-02-02 11:30     ` Andi Kleen
2008-02-04 19:03       ` Christoph Lameter
2008-02-04 18:20     ` Lee Schermerhorn
2008-02-05  9:26       ` [2.6.24 regression][BUGFIX] " KOSAKI Motohiro
2008-02-05 21:57         ` Lee Schermerhorn
2008-02-05 22:12           ` Christoph Lameter [this message]
2008-02-06 16:00             ` Lee Schermerhorn
2008-02-05 22:15           ` Paul Jackson
2008-02-06  2:17           ` David Rientjes
2008-02-06 16:11             ` Lee Schermerhorn
2008-02-06  6:49           ` KOSAKI Motohiro
2008-02-06 17:38         ` Lee Schermerhorn
2008-02-07  8:31           ` KOSAKI Motohiro
2008-02-08 19:45         ` [PATCH 2.6.24-mm1] Mempolicy: silently restrict nodemask to allowed nodes V3 Lee Schermerhorn
2008-02-09 18:11           ` KOSAKI Motohiro
2008-02-10  5:29           ` KOSAKI Motohiro
2008-02-10  5:49             ` Greg KH
2008-02-10  7:42               ` Linus Torvalds
2008-02-10 10:31                 ` Andrew Morton
2008-02-11 16:47                 ` Lee Schermerhorn
2008-02-12  4:30                   ` [PATCH for 2.6.24][regression fix] " KOSAKI Motohiro
2008-02-12  5:06                     ` David Rientjes
2008-02-12  5:07                     ` Andrew Morton
2008-02-12 13:18                       ` KOSAKI Motohiro
2008-02-05 10:17       ` [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node Paul Jackson
2008-02-05 11:14         ` KOSAKI Motohiro
2008-02-05 19:56         ` David Rientjes
2008-02-05 20:51           ` Paul Jackson
2008-02-05 21:03             ` David Rientjes
2008-02-05 21:33               ` Paul Jackson
2008-02-05 22:04                 ` Lee Schermerhorn
2008-02-05 22:44                   ` David Rientjes
2008-02-05 22:50                   ` Paul Jackson
2008-02-05 14:31       ` Mel Gorman
2008-02-05 15:23         ` Lee Schermerhorn
2008-02-05 18:12           ` Christoph Lameter
2008-02-05 18:27             ` Lee Schermerhorn
2008-02-05 19:04               ` Christoph Lameter
2008-02-05 19:15                 ` Paul Jackson
2008-02-05 20:06                   ` David Rientjes

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