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From: "Huang, Ying" <ying.huang@intel.com>
To: Gregory Price <gourry.memverge@gmail.com>
Cc: linux-mm@kvack.org,  linux-kernel@vger.kernel.org,
  linux-doc@vger.kernel.org,  linux-fsdevel@vger.kernel.org,
  linux-api@vger.kernel.org,  corbet@lwn.net,  akpm@linux-foundation.org,
  gregory.price@memverge.com,  honggyu.kim@sk.com,  rakie.kim@sk.com,
  hyeongtak.ji@sk.com,  mhocko@kernel.org,  vtavarespetr@micron.com,
  jgroves@micron.com,  ravis.opensrc@micron.com,  sthanneeru@micron.com,
  emirakhur@micron.com,  Hasan.Maruf@amd.com,  seungjun.ha@samsung.com,
  hannes@cmpxchg.org,  dan.j.williams@intel.com,  Srinivasulu Thanneeru
 <sthanneeru.opensrc@micron.com>
Subject: Re: [PATCH v2 3/3] mm/mempolicy: introduce MPOL_WEIGHTED_INTERLEAVE
 for weighted interleaving
In-Reply-To: <20240119175730.15484-4-gregory.price@memverge.com> (Gregory
	Price's message of "Fri, 19 Jan 2024 12:57:30 -0500")
References: <20240119175730.15484-1-gregory.price@memverge.com>
	<20240119175730.15484-4-gregory.price@memverge.com>
Date: Tue, 23 Jan 2024 11:02:03 +0800
Message-ID: <87jzo0vjkk.fsf@yhuang6-desk2.ccr.corp.intel.com>
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Gregory Price <gourry.memverge@gmail.com> writes:

> When a system has multiple NUMA nodes and it becomes bandwidth hungry,
> using the current MPOL_INTERLEAVE could be an wise option.
>
> However, if those NUMA nodes consist of different types of memory such
> as socket-attached DRAM and CXL/PCIe attached DRAM, the round-robin
> based interleave policy does not optimally distribute data to make use
> of their different bandwidth characteristics.
>
> Instead, interleave is more effective when the allocation policy follows
> each NUMA nodes' bandwidth weight rather than a simple 1:1 distribution.
>
> This patch introduces a new memory policy, MPOL_WEIGHTED_INTERLEAVE,
> enabling weighted interleave between NUMA nodes.  Weighted interleave
> allows for proportional distribution of memory across multiple numa
> nodes, preferably apportioned to match the bandwidth of each node.
>
> For example, if a system has 1 CPU node (0), and 2 memory nodes (0,1),
> with bandwidth of (100GB/s, 50GB/s) respectively, the appropriate
> weight distribution is (2:1).
>
> Weights for each node can be assigned via the new sysfs extension:
> /sys/kernel/mm/mempolicy/weighted_interleave/
>
> For now, the default value of all nodes will be `1`, which matches
> the behavior of standard 1:1 round-robin interleave. An extension
> will be added in the future to allow default values to be registered
> at kernel and device bringup time.
>
> The policy allocates a number of pages equal to the set weights. For
> example, if the weights are (2,1), then 2 pages will be allocated on
> node0 for every 1 page allocated on node1.
>
> The new flag MPOL_WEIGHTED_INTERLEAVE can be used in set_mempolicy(2)
> and mbind(2).
>
> There are 3 integration points:
>
> weighted_interleave_nodes:
>     Counts the number of allocations as they occur, and applies the
>     weight for the current node.  When the weight reaches 0, switch
>     to the next node.
>
> weighted_interleave_nid:
>     Gets the total weight of the nodemask as well as each individual
>     node weight, then calculates the node based on the given index.
>
> bulk_array_weighted_interleave:
>     Gets the total weight of the nodemask as well as each individual
>     node weight, then calculates the number of "interleave rounds" as
>     well as any delta ("partial round").  Calculates the number of
>     pages for each node and allocates them.
>
>     If a node was scheduled for interleave via interleave_nodes, the
>     current weight (pol->cur_weight) will be allocated first, before
>     the remaining bulk calculation is done.
>
> One piece of complexity is the interaction between a recent refactor
> which split the logic to acquire the "ilx" (interleave index) of an
> allocation and the actually application of the interleave.  The
> calculation of the `interleave index` is done by `get_vma_policy()`,
> while the actual selection of the node will be later appliex by the
> relevant weighted_interleave function.
>
> Suggested-by: Hasan Al Maruf <Hasan.Maruf@amd.com>
> Signed-off-by: Gregory Price <gregory.price@memverge.com>
> Co-developed-by: Rakie Kim <rakie.kim@sk.com>
> Signed-off-by: Rakie Kim <rakie.kim@sk.com>
> Co-developed-by: Honggyu Kim <honggyu.kim@sk.com>
> Signed-off-by: Honggyu Kim <honggyu.kim@sk.com>
> Co-developed-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
> Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
> Co-developed-by: Srinivasulu Thanneeru <sthanneeru.opensrc@micron.com>
> Signed-off-by: Srinivasulu Thanneeru <sthanneeru.opensrc@micron.com>
> Co-developed-by: Ravi Jonnalagadda <ravis.opensrc@micron.com>
> Signed-off-by: Ravi Jonnalagadda <ravis.opensrc@micron.com>
> ---
>  .../admin-guide/mm/numa_memory_policy.rst     |   9 +
>  include/linux/mempolicy.h                     |   5 +
>  include/uapi/linux/mempolicy.h                |   1 +
>  mm/mempolicy.c                                | 234 +++++++++++++++++-
>  4 files changed, 246 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/admin-guide/mm/numa_memory_policy.rst b/Documentation/admin-guide/mm/numa_memory_policy.rst
> index eca38fa81e0f..a70f20ce1ffb 100644
> --- a/Documentation/admin-guide/mm/numa_memory_policy.rst
> +++ b/Documentation/admin-guide/mm/numa_memory_policy.rst
> @@ -250,6 +250,15 @@ MPOL_PREFERRED_MANY
>  	can fall back to all existing numa nodes. This is effectively
>  	MPOL_PREFERRED allowed for a mask rather than a single node.
>  
> +MPOL_WEIGHTED_INTERLEAVE
> +	This mode operates the same as MPOL_INTERLEAVE, except that
> +	interleaving behavior is executed based on weights set in
> +	/sys/kernel/mm/mempolicy/weighted_interleave/
> +
> +	Weighted interleave allocates pages on nodes according to a
> +	weight.  For example if nodes [0,1] are weighted [5,2], 5 pages
> +	will be allocated on node0 for every 2 pages allocated on node1.
> +
>  NUMA memory policy supports the following optional mode flags:
>  
>  MPOL_F_STATIC_NODES
> diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
> index 931b118336f4..c1a083eb0dd5 100644
> --- a/include/linux/mempolicy.h
> +++ b/include/linux/mempolicy.h
> @@ -54,6 +54,11 @@ struct mempolicy {
>  		nodemask_t cpuset_mems_allowed;	/* relative to these nodes */
>  		nodemask_t user_nodemask;	/* nodemask passed by user */
>  	} w;
> +
> +	/* Weighted interleave settings */
> +	struct {
> +		u8 cur_weight;
> +	} wil;
>  };
>  
>  /*
> diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h
> index a8963f7ef4c2..1f9bb10d1a47 100644
> --- a/include/uapi/linux/mempolicy.h
> +++ b/include/uapi/linux/mempolicy.h
> @@ -23,6 +23,7 @@ enum {
>  	MPOL_INTERLEAVE,
>  	MPOL_LOCAL,
>  	MPOL_PREFERRED_MANY,
> +	MPOL_WEIGHTED_INTERLEAVE,
>  	MPOL_MAX,	/* always last member of enum */
>  };
>  
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index 427bddf115df..aa3b2389d3e0 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -19,6 +19,13 @@
>   *                for anonymous memory. For process policy an process counter
>   *                is used.
>   *
> + * weighted interleave
> + *                Allocate memory interleaved over a set of nodes based on
> + *                a set of weights (per-node), with normal fallback if it
> + *                fails.  Otherwise operates the same as interleave.
> + *                Example: nodeset(0,1) & weights (2,1) - 2 pages allocated
> + *                on node 0 for every 1 page allocated on node 1.
> + *
>   * bind           Only allocate memory on a specific set of nodes,
>   *                no fallback.
>   *                FIXME: memory is allocated starting with the first node
> @@ -313,6 +320,7 @@ static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags,
>  	policy->mode = mode;
>  	policy->flags = flags;
>  	policy->home_node = NUMA_NO_NODE;
> +	policy->wil.cur_weight = 0;
>  
>  	return policy;
>  }
> @@ -425,6 +433,10 @@ static const struct mempolicy_operations mpol_ops[MPOL_MAX] = {
>  		.create = mpol_new_nodemask,
>  		.rebind = mpol_rebind_preferred,
>  	},
> +	[MPOL_WEIGHTED_INTERLEAVE] = {
> +		.create = mpol_new_nodemask,
> +		.rebind = mpol_rebind_nodemask,
> +	},
>  };
>  
>  static bool migrate_folio_add(struct folio *folio, struct list_head *foliolist,
> @@ -846,7 +858,8 @@ static long do_set_mempolicy(unsigned short mode, unsigned short flags,
>  
>  	old = current->mempolicy;
>  	current->mempolicy = new;
> -	if (new && new->mode == MPOL_INTERLEAVE)
> +	if (new && (new->mode == MPOL_INTERLEAVE ||
> +		    new->mode == MPOL_WEIGHTED_INTERLEAVE))
>  		current->il_prev = MAX_NUMNODES-1;
>  	task_unlock(current);
>  	mpol_put(old);
> @@ -872,6 +885,7 @@ static void get_policy_nodemask(struct mempolicy *pol, nodemask_t *nodes)
>  	case MPOL_INTERLEAVE:
>  	case MPOL_PREFERRED:
>  	case MPOL_PREFERRED_MANY:
> +	case MPOL_WEIGHTED_INTERLEAVE:
>  		*nodes = pol->nodes;
>  		break;
>  	case MPOL_LOCAL:
> @@ -956,6 +970,13 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
>  		} else if (pol == current->mempolicy &&
>  				pol->mode == MPOL_INTERLEAVE) {
>  			*policy = next_node_in(current->il_prev, pol->nodes);
> +		} else if (pol == current->mempolicy &&
> +				(pol->mode == MPOL_WEIGHTED_INTERLEAVE)) {
> +			if (pol->wil.cur_weight)
> +				*policy = current->il_prev;
> +			else
> +				*policy = next_node_in(current->il_prev,
> +						       pol->nodes);
>  		} else {
>  			err = -EINVAL;
>  			goto out;
> @@ -1785,7 +1806,8 @@ struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
>  	pol = __get_vma_policy(vma, addr, ilx);
>  	if (!pol)
>  		pol = get_task_policy(current);
> -	if (pol->mode == MPOL_INTERLEAVE) {
> +	if (pol->mode == MPOL_INTERLEAVE ||
> +	    pol->mode == MPOL_WEIGHTED_INTERLEAVE) {

Should change the comments above get_vma_policy() definition too.

>  		*ilx += vma->vm_pgoff >> order;
>  		*ilx += (addr - vma->vm_start) >> (PAGE_SHIFT + order);
>  	}
> @@ -1835,6 +1857,28 @@ bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone)
>  	return zone >= dynamic_policy_zone;
>  }
>  
> +static unsigned int weighted_interleave_nodes(struct mempolicy *policy)
> +{
> +	unsigned int next;
> +	struct task_struct *me = current;
> +	u8 __rcu *table;
> +
> +	next = next_node_in(me->il_prev, policy->nodes);
> +	if (next == MAX_NUMNODES)
> +		return next;
> +
> +	rcu_read_lock();
> +	table = rcu_dereference(iw_table);
> +	if (!policy->wil.cur_weight)
> +		policy->wil.cur_weight = table ? table[next] : 1;
> +	rcu_read_unlock();
> +
> +	policy->wil.cur_weight--;
> +	if (!policy->wil.cur_weight)
> +		me->il_prev = next;
> +	return next;
> +}
> +
>  /* Do dynamic interleaving for a process */
>  static unsigned int interleave_nodes(struct mempolicy *policy)
>  {
> @@ -1869,6 +1913,9 @@ unsigned int mempolicy_slab_node(void)
>  	case MPOL_INTERLEAVE:
>  		return interleave_nodes(policy);
>  
> +	case MPOL_WEIGHTED_INTERLEAVE:
> +		return weighted_interleave_nodes(policy);
> +
>  	case MPOL_BIND:
>  	case MPOL_PREFERRED_MANY:
>  	{
> @@ -1907,6 +1954,39 @@ static unsigned int read_once_policy_nodemask(struct mempolicy *pol,
>  	return nodes_weight(*mask);
>  }
>  
> +static unsigned int weighted_interleave_nid(struct mempolicy *pol, pgoff_t ilx)
> +{
> +	nodemask_t nodemask;
> +	unsigned int target, nr_nodes;
> +	u8 __rcu *table;
> +	unsigned int weight_total = 0;
> +	u8 weight;
> +	int nid;
> +
> +	nr_nodes = read_once_policy_nodemask(pol, &nodemask);
> +	if (!nr_nodes)
> +		return numa_node_id();
> +
> +	rcu_read_lock();
> +	table = rcu_dereference(iw_table);
> +	/* calculate the total weight */
> +	for_each_node_mask(nid, nodemask)
> +		weight_total += table ? table[nid] : 1;
> +
> +	/* Calculate the node offset based on totals */
> +	target = ilx % weight_total;
> +	nid = first_node(nodemask);
> +	while (target) {
> +		weight = table ? table[nid] : 1;
> +		if (target < weight)
> +			break;
> +		target -= weight;
> +		nid = next_node_in(nid, nodemask);
> +	}
> +	rcu_read_unlock();
> +	return nid;
> +}
> +
>  /*
>   * Do static interleaving for interleave index @ilx.  Returns the ilx'th
>   * node in pol->nodes (starting from ilx=0), wrapping around if ilx
> @@ -1967,6 +2047,11 @@ static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *pol,
>  		*nid = (ilx == NO_INTERLEAVE_INDEX) ?
>  			interleave_nodes(pol) : interleave_nid(pol, ilx);
>  		break;
> +	case MPOL_WEIGHTED_INTERLEAVE:
> +		*nid = (ilx == NO_INTERLEAVE_INDEX) ?
> +			weighted_interleave_nodes(pol) :
> +			weighted_interleave_nid(pol, ilx);
> +		break;
>  	}
>  
>  	return nodemask;
> @@ -2028,6 +2113,7 @@ bool init_nodemask_of_mempolicy(nodemask_t *mask)
>  	case MPOL_PREFERRED_MANY:
>  	case MPOL_BIND:
>  	case MPOL_INTERLEAVE:
> +	case MPOL_WEIGHTED_INTERLEAVE:
>  		*mask = mempolicy->nodes;
>  		break;
>  
> @@ -2127,7 +2213,8 @@ struct page *alloc_pages_mpol(gfp_t gfp, unsigned int order,
>  		 * If the policy is interleave or does not allow the current
>  		 * node in its nodemask, we allocate the standard way.
>  		 */
> -		if (pol->mode != MPOL_INTERLEAVE &&
> +		if ((pol->mode != MPOL_INTERLEAVE &&
> +		    pol->mode != MPOL_WEIGHTED_INTERLEAVE) &&
>  		    (!nodemask || node_isset(nid, *nodemask))) {
>  			/*
>  			 * First, try to allocate THP only on local node, but
> @@ -2263,6 +2350,135 @@ static unsigned long alloc_pages_bulk_array_interleave(gfp_t gfp,
>  	return total_allocated;
>  }
>  
> +static unsigned long alloc_pages_bulk_array_weighted_interleave(gfp_t gfp,
> +		struct mempolicy *pol, unsigned long nr_pages,
> +		struct page **page_array)
> +{
> +	struct task_struct *me = current;
> +	unsigned long total_allocated = 0;
> +	unsigned long nr_allocated;
> +	unsigned long rounds;
> +	unsigned long node_pages, delta;
> +	u8 weight, resume_weight;
> +	u8 __rcu *table;
> +	u8 *weights;
> +	unsigned int weight_total = 0;
> +	unsigned long rem_pages = nr_pages;
> +	nodemask_t nodes;
> +	int nnodes, node, weight_nodes, resume_node;
> +	int prev_node = NUMA_NO_NODE;

It appears that we should initialize prev_node with me->il_prev?
Details are as below.

> +	bool delta_depleted = false;
> +	int i;
> +
> +	if (!nr_pages)
> +		return 0;
> +
> +	nnodes = read_once_policy_nodemask(pol, &nodes);
> +	if (!nnodes)
> +		return 0;
> +
> +	/* Continue allocating from most recent node and adjust the nr_pages */
> +	if (pol->wil.cur_weight) {
> +		node = next_node_in(me->il_prev, nodes);
> +		node_pages = pol->wil.cur_weight;
> +		if (node_pages > rem_pages)
> +			node_pages = rem_pages;
> +		nr_allocated = __alloc_pages_bulk(gfp, node, NULL, node_pages,
> +						  NULL, page_array);
> +		page_array += nr_allocated;
> +		total_allocated += nr_allocated;
> +		/* if that's all the pages, no need to interleave */
> +		if (rem_pages <= pol->wil.cur_weight) {
> +			pol->wil.cur_weight -= rem_pages;

If "pol->wil.cur_weight == 0" here, we need to change me->il_prev?

> +			return total_allocated;
> +		}
> +		/* Otherwise we adjust nr_pages down, and continue from there */
> +		rem_pages -= pol->wil.cur_weight;
> +		pol->wil.cur_weight = 0;
> +		prev_node = node;
> +	}

        else {
                prev_node = me->il_prev;
        }

> +
> +	/* fetch the weights for this operation and calculate total weight */
> +	weights = kmalloc(nnodes, GFP_KERNEL);
> +	if (!weights)
> +		return total_allocated;
> +
> +	rcu_read_lock();
> +	table = rcu_dereference(iw_table);
> +	weight_nodes = 0;

We can replace "weight_nodes" with "i" and use a "for" loop?

> +	while (weight_nodes < nnodes) {
> +		node = next_node_in(prev_node, nodes);

IIUC, "node" will not change in the loop, so all "weight" below will be
the same value.  To keep it simple, I think we can just copy weights
from the global iw_table and consider the default value?

> +		weight = table ? table[node] : 1;
> +		weights[weight_nodes++] = weight;
> +		weight_total += weight;
> +	}
> +	rcu_read_unlock();
> +
> +	/*
> +	 * Now we can continue allocating from 0 instead of an offset
> +	 * We calculate the number of rounds and any partial rounds so
> +	 * that we minimize the number of calls to __alloc_pages_bulk
> +	 * This requires us to track which node we should resume from.
> +	 *
> +	 * if (rounds > 0) and (delta == 0), resume_node will always be
> +	 * the current me->il_prev
> +	 *
> +	 * if (delta > 0) and delta is depleted exactly on a node-weight
> +	 * boundary, resume node will be the node last allocated from when
> +	 * delta reached 0.
> +	 *
> +	 * if (delta > 0) and delta is not depleted on a node-weight boundary,
> +	 * resume node will be the node prior to the node last allocated from.
> +	 *
> +	 * (rounds == 0) and (delta == 0) is not possible (earlier exit)
> +	 */
> +	rounds = rem_pages / weight_total;
> +	delta = rem_pages % weight_total;
> +	/* If no delta, we'll resume from current prev_node and first weight */
> +	for (i = 0; i < nnodes; i++) {
> +		node = next_node_in(prev_node, nodes);
> +		weight = weights[i];
> +		node_pages = weight * rounds;
> +		/* If a delta exists, add this node's portion of the delta */
> +		if (delta >= weight) {
> +			node_pages += weight;
> +			delta -= weight;
> +			resume_node = node;
> +			resume_weight = i < (nnodes - 1) ? weights[i+1] :
> +							   weights[0];
> +			/* stop tracking iff (delta == weight) */
> +			delta_depleted = !delta;
> +		} else if (delta) { /* <= weight */

The comment is unnecessary and wrong.

> +			/* if delta depleted, resume from this node */
> +			node_pages += delta;
> +			delta = 0;
> +			resume_node = prev_node;
> +			resume_weight = weight - (node_pages % weight);
> +			delta_depleted = true; /* stop tracking */
> +		} else if (!delta_depleted) {
> +			/* if there was no delta, track last allocated node */
> +			resume_node = node;
> +			resume_weight = i < (nnodes - 1) ? weights[i+1] :
> +							   weights[0];
> +		}

Can the above code be simplified as something like below?

        resume_node = prev_node;
        resume_weight = 0;
        for (...) {
                ...
                if (delta > weight) {
			node_pages += weight;
			delta -= weight;
		} else if (delta) {
			node_pages += delta;
        		/* if delta depleted, resume from this node */
                        if (delta < weight) {
                                resume_node = prev_node;
                                resume_weight = weight - delta;
                        } else {
                                resume_node = node;
                        }
			delta = 0;
                }
                ...
        }

--
Best Regards,
Huang, Ying

> +		/* node_pages can be 0 if an allocation fails and rounds == 0 */
> +		if (!node_pages)
> +			break;
> +		nr_allocated = __alloc_pages_bulk(gfp, node, NULL, node_pages,
> +						  NULL, page_array);
> +		page_array += nr_allocated;
> +		total_allocated += nr_allocated;
> +		if (total_allocated == nr_pages)
> +			break;
> +		prev_node = node;
> +	}
> +	/* resume allocating from the calculated node and weight */
> +	me->il_prev = resume_node;
> +	pol->wil.cur_weight = resume_weight;
> +	kfree(weights);
> +	return total_allocated;
> +}
> +
>  static unsigned long alloc_pages_bulk_array_preferred_many(gfp_t gfp, int nid,
>  		struct mempolicy *pol, unsigned long nr_pages,
>  		struct page **page_array)
> @@ -2303,6 +2519,10 @@ unsigned long alloc_pages_bulk_array_mempolicy(gfp_t gfp,
>  		return alloc_pages_bulk_array_interleave(gfp, pol,
>  							 nr_pages, page_array);
>  
> +	if (pol->mode == MPOL_WEIGHTED_INTERLEAVE)
> +		return alloc_pages_bulk_array_weighted_interleave(
> +				  gfp, pol, nr_pages, page_array);
> +
>  	if (pol->mode == MPOL_PREFERRED_MANY)
>  		return alloc_pages_bulk_array_preferred_many(gfp,
>  				numa_node_id(), pol, nr_pages, page_array);
> @@ -2378,6 +2598,7 @@ bool __mpol_equal(struct mempolicy *a, struct mempolicy *b)
>  	case MPOL_INTERLEAVE:
>  	case MPOL_PREFERRED:
>  	case MPOL_PREFERRED_MANY:
> +	case MPOL_WEIGHTED_INTERLEAVE:
>  		return !!nodes_equal(a->nodes, b->nodes);
>  	case MPOL_LOCAL:
>  		return true;
> @@ -2514,6 +2735,10 @@ int mpol_misplaced(struct folio *folio, struct vm_area_struct *vma,
>  		polnid = interleave_nid(pol, ilx);
>  		break;
>  
> +	case MPOL_WEIGHTED_INTERLEAVE:
> +		polnid = weighted_interleave_nid(pol, ilx);
> +		break;
> +
>  	case MPOL_PREFERRED:
>  		if (node_isset(curnid, pol->nodes))
>  			goto out;
> @@ -2888,6 +3113,7 @@ static const char * const policy_modes[] =
>  	[MPOL_PREFERRED]  = "prefer",
>  	[MPOL_BIND]       = "bind",
>  	[MPOL_INTERLEAVE] = "interleave",
> +	[MPOL_WEIGHTED_INTERLEAVE] = "weighted interleave",
>  	[MPOL_LOCAL]      = "local",
>  	[MPOL_PREFERRED_MANY]  = "prefer (many)",
>  };
> @@ -2947,6 +3173,7 @@ int mpol_parse_str(char *str, struct mempolicy **mpol)
>  		}
>  		break;
>  	case MPOL_INTERLEAVE:
> +	case MPOL_WEIGHTED_INTERLEAVE:
>  		/*
>  		 * Default to online nodes with memory if no nodelist
>  		 */
> @@ -3057,6 +3284,7 @@ void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
>  	case MPOL_PREFERRED_MANY:
>  	case MPOL_BIND:
>  	case MPOL_INTERLEAVE:
> +	case MPOL_WEIGHTED_INTERLEAVE:
>  		nodes = pol->nodes;
>  		break;
>  	default: