mm: filter based on a nodemask as well as a gfp_mask
The MPOL_BIND policy creates a zonelist that is used for allocations controlled by that mempolicy. As the per-node zonelist is already being filtered based on a zone id, this patch adds a version of __alloc_pages() that takes a nodemask for further filtering. This eliminates the need for MPOL_BIND to create a custom zonelist. A positive benefit of this is that allocations using MPOL_BIND now use the local node's distance-ordered zonelist instead of a custom node-id-ordered zonelist. I.e., pages will be allocated from the closest allowed node with available memory. [Lee.Schermerhorn@hp.com: Mempolicy: update stale documentation and comments] [Lee.Schermerhorn@hp.com: Mempolicy: make dequeue_huge_page_vma() obey MPOL_BIND nodemask] [Lee.Schermerhorn@hp.com: Mempolicy: make dequeue_huge_page_vma() obey MPOL_BIND nodemask rework] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Hugh Dickins <hugh@veritas.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman
Linus Torvalds
Родитель
dd1a239f6f
Коммит
19770b3260
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@ -182,14 +182,9 @@ Components of Memory Policies
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The Default mode does not use the optional set of nodes.
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MPOL_BIND: This mode specifies that memory must come from the
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set of nodes specified by the policy.
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The memory policy APIs do not specify an order in which the nodes
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will be searched. However, unlike "local allocation", the Bind
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policy does not consider the distance between the nodes. Rather,
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allocations will fallback to the nodes specified by the policy in
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order of numeric node id. Like everything in Linux, this is subject
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to change.
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set of nodes specified by the policy. Memory will be allocated from
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the node in the set with sufficient free memory that is closest to
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the node where the allocation takes place.
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MPOL_PREFERRED: This mode specifies that the allocation should be
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attempted from the single node specified in the policy. If that
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@ -360,16 +360,17 @@ void invalidate_bdev(struct block_device *bdev)
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*/
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static void free_more_memory(void)
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{
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struct zoneref *zrefs;
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struct zone *zone;
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int nid;
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wakeup_pdflush(1024);
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yield();
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for_each_online_node(nid) {
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zrefs = first_zones_zonelist(node_zonelist(nid, GFP_NOFS),
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gfp_zone(GFP_NOFS));
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if (zrefs->zone)
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(void)first_zones_zonelist(node_zonelist(nid, GFP_NOFS),
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gfp_zone(GFP_NOFS), NULL,
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&zone);
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if (zone)
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try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0,
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GFP_NOFS);
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}
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@ -26,7 +26,7 @@ extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
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#define cpuset_current_mems_allowed (current->mems_allowed)
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void cpuset_init_current_mems_allowed(void);
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void cpuset_update_task_memory_state(void);
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int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl);
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int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
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extern int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask);
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extern int __cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask);
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@ -103,7 +103,7 @@ static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
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static inline void cpuset_init_current_mems_allowed(void) {}
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static inline void cpuset_update_task_memory_state(void) {}
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static inline int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
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static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
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{
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return 1;
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}
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@ -182,6 +182,10 @@ static inline void arch_alloc_page(struct page *page, int order) { }
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extern struct page *__alloc_pages(gfp_t, unsigned int, struct zonelist *);
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extern struct page *
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__alloc_pages_nodemask(gfp_t, unsigned int,
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struct zonelist *, nodemask_t *nodemask);
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static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
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unsigned int order)
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{
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@ -54,19 +54,20 @@ struct mm_struct;
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* mmap_sem.
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*
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* Freeing policy:
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* When policy is MPOL_BIND v.zonelist is kmalloc'ed and must be kfree'd.
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* All other policies don't have any external state. mpol_free() handles this.
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* Mempolicy objects are reference counted. A mempolicy will be freed when
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* mpol_free() decrements the reference count to zero.
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*
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* Copying policy objects:
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* For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this.
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* mpol_copy() allocates a new mempolicy and copies the specified mempolicy
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* to the new storage. The reference count of the new object is initialized
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* to 1, representing the caller of mpol_copy().
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*/
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struct mempolicy {
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atomic_t refcnt;
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short policy; /* See MPOL_* above */
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union {
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struct zonelist *zonelist; /* bind */
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short preferred_node; /* preferred */
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nodemask_t nodes; /* interleave */
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nodemask_t nodes; /* interleave/bind */
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/* undefined for default */
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} v;
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nodemask_t cpuset_mems_allowed; /* mempolicy relative to these nodes */
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@ -151,7 +152,8 @@ extern void mpol_fix_fork_child_flag(struct task_struct *p);
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extern struct mempolicy default_policy;
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extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
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unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol);
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unsigned long addr, gfp_t gfp_flags,
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struct mempolicy **mpol, nodemask_t **nodemask);
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extern unsigned slab_node(struct mempolicy *policy);
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extern enum zone_type policy_zone;
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@ -239,8 +241,11 @@ static inline void mpol_fix_fork_child_flag(struct task_struct *p)
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}
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static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
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unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol)
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unsigned long addr, gfp_t gfp_flags,
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struct mempolicy **mpol, nodemask_t **nodemask)
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{
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*mpol = NULL;
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*nodemask = NULL;
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return node_zonelist(0, gfp_flags);
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}
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@ -749,36 +749,60 @@ static inline int zonelist_node_idx(struct zoneref *zoneref)
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#endif /* CONFIG_NUMA */
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}
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static inline void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
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{
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zoneref->zone = zone;
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zoneref->zone_idx = zone_idx(zone);
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}
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/**
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* next_zones_zonelist - Returns the next zone at or below highest_zoneidx within the allowed nodemask using a cursor within a zonelist as a starting point
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* @z - The cursor used as a starting point for the search
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* @highest_zoneidx - The zone index of the highest zone to return
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* @nodes - An optional nodemask to filter the zonelist with
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* @zone - The first suitable zone found is returned via this parameter
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*
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* This function returns the next zone at or below a given zone index that is
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* within the allowed nodemask using a cursor as the starting point for the
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* search. The zoneref returned is a cursor that is used as the next starting
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* point for future calls to next_zones_zonelist().
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*/
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struct zoneref *next_zones_zonelist(struct zoneref *z,
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enum zone_type highest_zoneidx,
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nodemask_t *nodes,
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struct zone **zone);
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/* Returns the first zone at or below highest_zoneidx in a zonelist */
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/**
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* first_zones_zonelist - Returns the first zone at or below highest_zoneidx within the allowed nodemask in a zonelist
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* @zonelist - The zonelist to search for a suitable zone
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* @highest_zoneidx - The zone index of the highest zone to return
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* @nodes - An optional nodemask to filter the zonelist with
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* @zone - The first suitable zone found is returned via this parameter
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*
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* This function returns the first zone at or below a given zone index that is
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* within the allowed nodemask. The zoneref returned is a cursor that can be
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* used to iterate the zonelist with next_zones_zonelist. The cursor should
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* not be used by the caller as it does not match the value of the zone
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* returned.
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*/
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static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
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enum zone_type highest_zoneidx)
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enum zone_type highest_zoneidx,
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nodemask_t *nodes,
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struct zone **zone)
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{
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struct zoneref *z;
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/* Find the first suitable zone to use for the allocation */
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z = zonelist->_zonerefs;
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while (zonelist_zone_idx(z) > highest_zoneidx)
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z++;
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return z;
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return next_zones_zonelist(zonelist->_zonerefs, highest_zoneidx, nodes,
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zone);
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}
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/* Returns the next zone at or below highest_zoneidx in a zonelist */
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static inline struct zoneref *next_zones_zonelist(struct zoneref *z,
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enum zone_type highest_zoneidx)
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{
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/* Find the next suitable zone to use for the allocation */
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while (zonelist_zone_idx(z) > highest_zoneidx)
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z++;
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return z;
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}
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/**
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* for_each_zone_zonelist_nodemask - helper macro to iterate over valid zones in a zonelist at or below a given zone index and within a nodemask
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* @zone - The current zone in the iterator
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* @z - The current pointer within zonelist->zones being iterated
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* @zlist - The zonelist being iterated
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* @highidx - The zone index of the highest zone to return
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* @nodemask - Nodemask allowed by the allocator
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*
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* This iterator iterates though all zones at or below a given zone index and
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* within a given nodemask
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*/
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#define for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, nodemask) \
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for (z = first_zones_zonelist(zlist, highidx, nodemask, &zone); \
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zone; \
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z = next_zones_zonelist(z, highidx, nodemask, &zone)) \
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/**
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* for_each_zone_zonelist - helper macro to iterate over valid zones in a zonelist at or below a given zone index
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@ -790,11 +814,7 @@ static inline struct zoneref *next_zones_zonelist(struct zoneref *z,
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* This iterator iterates though all zones at or below a given zone index.
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*/
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#define for_each_zone_zonelist(zone, z, zlist, highidx) \
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for (z = first_zones_zonelist(zlist, highidx), \
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zone = zonelist_zone(z++); \
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zone; \
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z = next_zones_zonelist(z, highidx), \
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zone = zonelist_zone(z++))
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for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, NULL)
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#ifdef CONFIG_SPARSEMEM
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#include <asm/sparsemem.h>
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@ -1958,22 +1958,14 @@ nodemask_t cpuset_mems_allowed(struct task_struct *tsk)
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}
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/**
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* cpuset_zonelist_valid_mems_allowed - check zonelist vs. curremt mems_allowed
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* @zl: the zonelist to be checked
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* cpuset_nodemask_valid_mems_allowed - check nodemask vs. curremt mems_allowed
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* @nodemask: the nodemask to be checked
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*
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* Are any of the nodes on zonelist zl allowed in current->mems_allowed?
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* Are any of the nodes in the nodemask allowed in current->mems_allowed?
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*/
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int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
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int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
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{
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int i;
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for (i = 0; zl->_zonerefs[i].zone; i++) {
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int nid = zonelist_node_idx(&zl->_zonerefs[i]);
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if (node_isset(nid, current->mems_allowed))
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return 1;
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}
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return 0;
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return nodes_intersects(*nodemask, current->mems_allowed);
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}
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/*
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@ -95,12 +95,14 @@ static struct page *dequeue_huge_page_vma(struct vm_area_struct *vma,
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int nid;
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struct page *page = NULL;
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struct mempolicy *mpol;
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nodemask_t *nodemask;
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struct zonelist *zonelist = huge_zonelist(vma, address,
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htlb_alloc_mask, &mpol);
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htlb_alloc_mask, &mpol, &nodemask);
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struct zone *zone;
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struct zoneref *z;
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for_each_zone_zonelist(zone, z, zonelist, MAX_NR_ZONES - 1) {
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for_each_zone_zonelist_nodemask(zone, z, zonelist,
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MAX_NR_ZONES - 1, nodemask) {
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nid = zone_to_nid(zone);
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if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask) &&
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!list_empty(&hugepage_freelists[nid])) {
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|
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184
mm/mempolicy.c
184
mm/mempolicy.c
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@ -163,42 +163,25 @@ static int mpol_check_policy(int mode, nodemask_t *nodes)
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return 0;
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}
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/* Generate a custom zonelist for the BIND policy. */
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static struct zonelist *bind_zonelist(nodemask_t *nodes)
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/* Check that the nodemask contains at least one populated zone */
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static int is_valid_nodemask(nodemask_t *nodemask)
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{
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struct zonelist *zl;
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int num, max, nd;
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enum zone_type k;
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int nd, k;
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max = 1 + MAX_NR_ZONES * nodes_weight(*nodes);
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max++; /* space for zlcache_ptr (see mmzone.h) */
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zl = kmalloc(sizeof(struct zone *) * max, GFP_KERNEL);
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if (!zl)
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return ERR_PTR(-ENOMEM);
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zl->zlcache_ptr = NULL;
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num = 0;
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/* First put in the highest zones from all nodes, then all the next
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lower zones etc. Avoid empty zones because the memory allocator
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doesn't like them. If you implement node hot removal you
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have to fix that. */
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k = MAX_NR_ZONES - 1;
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while (1) {
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for_each_node_mask(nd, *nodes) {
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struct zone *z = &NODE_DATA(nd)->node_zones[k];
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if (z->present_pages > 0)
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zoneref_set_zone(z, &zl->_zonerefs[num++]);
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/* Check that there is something useful in this mask */
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k = policy_zone;
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for_each_node_mask(nd, *nodemask) {
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struct zone *z;
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for (k = 0; k <= policy_zone; k++) {
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z = &NODE_DATA(nd)->node_zones[k];
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if (z->present_pages > 0)
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return 1;
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}
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if (k == 0)
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break;
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k--;
|
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}
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if (num == 0) {
|
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kfree(zl);
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return ERR_PTR(-EINVAL);
|
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}
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zl->_zonerefs[num].zone = NULL;
|
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zl->_zonerefs[num].zone_idx = 0;
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return zl;
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return 0;
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}
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/* Create a new policy */
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|
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@ -229,12 +212,11 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
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policy->v.preferred_node = -1;
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break;
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case MPOL_BIND:
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policy->v.zonelist = bind_zonelist(nodes);
|
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if (IS_ERR(policy->v.zonelist)) {
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void *error_code = policy->v.zonelist;
|
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if (!is_valid_nodemask(nodes)) {
|
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kmem_cache_free(policy_cache, policy);
|
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return error_code;
|
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return ERR_PTR(-EINVAL);
|
||||
}
|
||||
policy->v.nodes = *nodes;
|
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break;
|
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}
|
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policy->policy = mode;
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@ -500,19 +482,12 @@ static long do_set_mempolicy(int mode, nodemask_t *nodes)
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/* Fill a zone bitmap for a policy */
|
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static void get_zonemask(struct mempolicy *p, nodemask_t *nodes)
|
||||
{
|
||||
int i;
|
||||
|
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nodes_clear(*nodes);
|
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switch (p->policy) {
|
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case MPOL_BIND:
|
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for (i = 0; p->v.zonelist->_zonerefs[i].zone; i++) {
|
||||
struct zoneref *zref;
|
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zref = &p->v.zonelist->_zonerefs[i];
|
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node_set(zonelist_node_idx(zref), *nodes);
|
||||
}
|
||||
break;
|
||||
case MPOL_DEFAULT:
|
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break;
|
||||
case MPOL_BIND:
|
||||
/* Fall through */
|
||||
case MPOL_INTERLEAVE:
|
||||
*nodes = p->v.nodes;
|
||||
break;
|
||||
|
|
@ -1160,6 +1135,18 @@ static struct mempolicy * get_vma_policy(struct task_struct *task,
|
|||
return pol;
|
||||
}
|
||||
|
||||
/* Return a nodemask representing a mempolicy */
|
||||
static nodemask_t *nodemask_policy(gfp_t gfp, struct mempolicy *policy)
|
||||
{
|
||||
/* Lower zones don't get a nodemask applied for MPOL_BIND */
|
||||
if (unlikely(policy->policy == MPOL_BIND) &&
|
||||
gfp_zone(gfp) >= policy_zone &&
|
||||
cpuset_nodemask_valid_mems_allowed(&policy->v.nodes))
|
||||
return &policy->v.nodes;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Return a zonelist representing a mempolicy */
|
||||
static struct zonelist *zonelist_policy(gfp_t gfp, struct mempolicy *policy)
|
||||
{
|
||||
|
|
@ -1172,12 +1159,17 @@ static struct zonelist *zonelist_policy(gfp_t gfp, struct mempolicy *policy)
|
|||
nd = numa_node_id();
|
||||
break;
|
||||
case MPOL_BIND:
|
||||
/* Lower zones don't get a policy applied */
|
||||
/* Careful: current->mems_allowed might have moved */
|
||||
if (gfp_zone(gfp) >= policy_zone)
|
||||
if (cpuset_zonelist_valid_mems_allowed(policy->v.zonelist))
|
||||
return policy->v.zonelist;
|
||||
/*FALL THROUGH*/
|
||||
/*
|
||||
* Normally, MPOL_BIND allocations node-local are node-local
|
||||
* within the allowed nodemask. However, if __GFP_THISNODE is
|
||||
* set and the current node is part of the mask, we use the
|
||||
* the zonelist for the first node in the mask instead.
|
||||
*/
|
||||
nd = numa_node_id();
|
||||
if (unlikely(gfp & __GFP_THISNODE) &&
|
||||
unlikely(!node_isset(nd, policy->v.nodes)))
|
||||
nd = first_node(policy->v.nodes);
|
||||
break;
|
||||
case MPOL_INTERLEAVE: /* should not happen */
|
||||
case MPOL_DEFAULT:
|
||||
nd = numa_node_id();
|
||||
|
|
@ -1220,7 +1212,14 @@ unsigned slab_node(struct mempolicy *policy)
|
|||
* Follow bind policy behavior and start allocation at the
|
||||
* first node.
|
||||
*/
|
||||
return zonelist_node_idx(policy->v.zonelist->_zonerefs);
|
||||
struct zonelist *zonelist;
|
||||
struct zone *zone;
|
||||
enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL);
|
||||
zonelist = &NODE_DATA(numa_node_id())->node_zonelists[0];
|
||||
(void)first_zones_zonelist(zonelist, highest_zoneidx,
|
||||
&policy->v.nodes,
|
||||
&zone);
|
||||
return zone->node;
|
||||
}
|
||||
|
||||
case MPOL_PREFERRED:
|
||||
|
|
@ -1278,25 +1277,31 @@ static inline unsigned interleave_nid(struct mempolicy *pol,
|
|||
* @vma = virtual memory area whose policy is sought
|
||||
* @addr = address in @vma for shared policy lookup and interleave policy
|
||||
* @gfp_flags = for requested zone
|
||||
* @mpol = pointer to mempolicy pointer for reference counted 'BIND policy
|
||||
* @mpol = pointer to mempolicy pointer for reference counted mempolicy
|
||||
* @nodemask = pointer to nodemask pointer for MPOL_BIND nodemask
|
||||
*
|
||||
* Returns a zonelist suitable for a huge page allocation.
|
||||
* If the effective policy is 'BIND, returns pointer to policy's zonelist.
|
||||
* If the effective policy is 'BIND, returns pointer to local node's zonelist,
|
||||
* and a pointer to the mempolicy's @nodemask for filtering the zonelist.
|
||||
* If it is also a policy for which get_vma_policy() returns an extra
|
||||
* reference, we must hold that reference until after allocation.
|
||||
* reference, we must hold that reference until after the allocation.
|
||||
* In that case, return policy via @mpol so hugetlb allocation can drop
|
||||
* the reference. For non-'BIND referenced policies, we can/do drop the
|
||||
* the reference. For non-'BIND referenced policies, we can/do drop the
|
||||
* reference here, so the caller doesn't need to know about the special case
|
||||
* for default and current task policy.
|
||||
*/
|
||||
struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr,
|
||||
gfp_t gfp_flags, struct mempolicy **mpol)
|
||||
gfp_t gfp_flags, struct mempolicy **mpol,
|
||||
nodemask_t **nodemask)
|
||||
{
|
||||
struct mempolicy *pol = get_vma_policy(current, vma, addr);
|
||||
struct zonelist *zl;
|
||||
|
||||
*mpol = NULL; /* probably no unref needed */
|
||||
if (pol->policy == MPOL_INTERLEAVE) {
|
||||
*nodemask = NULL; /* assume !MPOL_BIND */
|
||||
if (pol->policy == MPOL_BIND) {
|
||||
*nodemask = &pol->v.nodes;
|
||||
} else if (pol->policy == MPOL_INTERLEAVE) {
|
||||
unsigned nid;
|
||||
|
||||
nid = interleave_nid(pol, vma, addr, HPAGE_SHIFT);
|
||||
|
|
@ -1376,14 +1381,15 @@ alloc_page_vma(gfp_t gfp, struct vm_area_struct *vma, unsigned long addr)
|
|||
/*
|
||||
* slow path: ref counted policy -- shared or vma
|
||||
*/
|
||||
struct page *page = __alloc_pages(gfp, 0, zl);
|
||||
struct page *page = __alloc_pages_nodemask(gfp, 0,
|
||||
zl, nodemask_policy(gfp, pol));
|
||||
__mpol_free(pol);
|
||||
return page;
|
||||
}
|
||||
/*
|
||||
* fast path: default or task policy
|
||||
*/
|
||||
return __alloc_pages(gfp, 0, zl);
|
||||
return __alloc_pages_nodemask(gfp, 0, zl, nodemask_policy(gfp, pol));
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1415,7 +1421,8 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
|
|||
pol = &default_policy;
|
||||
if (pol->policy == MPOL_INTERLEAVE)
|
||||
return alloc_page_interleave(gfp, order, interleave_nodes(pol));
|
||||
return __alloc_pages(gfp, order, zonelist_policy(gfp, pol));
|
||||
return __alloc_pages_nodemask(gfp, order,
|
||||
zonelist_policy(gfp, pol), nodemask_policy(gfp, pol));
|
||||
}
|
||||
EXPORT_SYMBOL(alloc_pages_current);
|
||||
|
||||
|
|
@ -1440,14 +1447,6 @@ struct mempolicy *__mpol_copy(struct mempolicy *old)
|
|||
}
|
||||
*new = *old;
|
||||
atomic_set(&new->refcnt, 1);
|
||||
if (new->policy == MPOL_BIND) {
|
||||
int sz = ksize(old->v.zonelist);
|
||||
new->v.zonelist = kmemdup(old->v.zonelist, sz, GFP_KERNEL);
|
||||
if (!new->v.zonelist) {
|
||||
kmem_cache_free(policy_cache, new);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
}
|
||||
return new;
|
||||
}
|
||||
|
||||
|
|
@ -1461,21 +1460,12 @@ int __mpol_equal(struct mempolicy *a, struct mempolicy *b)
|
|||
switch (a->policy) {
|
||||
case MPOL_DEFAULT:
|
||||
return 1;
|
||||
case MPOL_BIND:
|
||||
/* Fall through */
|
||||
case MPOL_INTERLEAVE:
|
||||
return nodes_equal(a->v.nodes, b->v.nodes);
|
||||
case MPOL_PREFERRED:
|
||||
return a->v.preferred_node == b->v.preferred_node;
|
||||
case MPOL_BIND: {
|
||||
int i;
|
||||
for (i = 0; a->v.zonelist->_zonerefs[i].zone; i++) {
|
||||
struct zone *za, *zb;
|
||||
za = zonelist_zone(&a->v.zonelist->_zonerefs[i]);
|
||||
zb = zonelist_zone(&b->v.zonelist->_zonerefs[i]);
|
||||
if (za != zb)
|
||||
return 0;
|
||||
}
|
||||
return b->v.zonelist->_zonerefs[i].zone == NULL;
|
||||
}
|
||||
default:
|
||||
BUG();
|
||||
return 0;
|
||||
|
|
@ -1487,8 +1477,6 @@ void __mpol_free(struct mempolicy *p)
|
|||
{
|
||||
if (!atomic_dec_and_test(&p->refcnt))
|
||||
return;
|
||||
if (p->policy == MPOL_BIND)
|
||||
kfree(p->v.zonelist);
|
||||
p->policy = MPOL_DEFAULT;
|
||||
kmem_cache_free(policy_cache, p);
|
||||
}
|
||||
|
|
@ -1779,6 +1767,8 @@ static void mpol_rebind_policy(struct mempolicy *pol,
|
|||
switch (pol->policy) {
|
||||
case MPOL_DEFAULT:
|
||||
break;
|
||||
case MPOL_BIND:
|
||||
/* Fall through */
|
||||
case MPOL_INTERLEAVE:
|
||||
nodes_remap(tmp, pol->v.nodes, *mpolmask, *newmask);
|
||||
pol->v.nodes = tmp;
|
||||
|
|
@ -1791,32 +1781,6 @@ static void mpol_rebind_policy(struct mempolicy *pol,
|
|||
*mpolmask, *newmask);
|
||||
*mpolmask = *newmask;
|
||||
break;
|
||||
case MPOL_BIND: {
|
||||
nodemask_t nodes;
|
||||
struct zoneref *z;
|
||||
struct zonelist *zonelist;
|
||||
|
||||
nodes_clear(nodes);
|
||||
for (z = pol->v.zonelist->_zonerefs; z->zone; z++)
|
||||
node_set(zonelist_node_idx(z), nodes);
|
||||
nodes_remap(tmp, nodes, *mpolmask, *newmask);
|
||||
nodes = tmp;
|
||||
|
||||
zonelist = bind_zonelist(&nodes);
|
||||
|
||||
/* If no mem, then zonelist is NULL and we keep old zonelist.
|
||||
* If that old zonelist has no remaining mems_allowed nodes,
|
||||
* then zonelist_policy() will "FALL THROUGH" to MPOL_DEFAULT.
|
||||
*/
|
||||
|
||||
if (!IS_ERR(zonelist)) {
|
||||
/* Good - got mem - substitute new zonelist */
|
||||
kfree(pol->v.zonelist);
|
||||
pol->v.zonelist = zonelist;
|
||||
}
|
||||
*mpolmask = *newmask;
|
||||
break;
|
||||
}
|
||||
default:
|
||||
BUG();
|
||||
break;
|
||||
|
|
@ -1879,9 +1843,7 @@ static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
|
|||
break;
|
||||
|
||||
case MPOL_BIND:
|
||||
get_zonemask(pol, &nodes);
|
||||
break;
|
||||
|
||||
/* Fall through */
|
||||
case MPOL_INTERLEAVE:
|
||||
nodes = pol->v.nodes;
|
||||
break;
|
||||
|
|
|
|||
30
mm/mmzone.c
30
mm/mmzone.c
|
|
@ -42,3 +42,33 @@ struct zone *next_zone(struct zone *zone)
|
|||
return zone;
|
||||
}
|
||||
|
||||
static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
|
||||
{
|
||||
#ifdef CONFIG_NUMA
|
||||
return node_isset(zonelist_node_idx(zref), *nodes);
|
||||
#else
|
||||
return 1;
|
||||
#endif /* CONFIG_NUMA */
|
||||
}
|
||||
|
||||
/* Returns the next zone at or below highest_zoneidx in a zonelist */
|
||||
struct zoneref *next_zones_zonelist(struct zoneref *z,
|
||||
enum zone_type highest_zoneidx,
|
||||
nodemask_t *nodes,
|
||||
struct zone **zone)
|
||||
{
|
||||
/*
|
||||
* Find the next suitable zone to use for the allocation.
|
||||
* Only filter based on nodemask if it's set
|
||||
*/
|
||||
if (likely(nodes == NULL))
|
||||
while (zonelist_zone_idx(z) > highest_zoneidx)
|
||||
z++;
|
||||
else
|
||||
while (zonelist_zone_idx(z) > highest_zoneidx ||
|
||||
(z->zone && !zref_in_nodemask(z, nodes)))
|
||||
z++;
|
||||
|
||||
*zone = zonelist_zone(z++);
|
||||
return z;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1377,7 +1377,7 @@ static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z)
|
|||
* a page.
|
||||
*/
|
||||
static struct page *
|
||||
get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
|
||||
get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
|
||||
struct zonelist *zonelist, int high_zoneidx, int alloc_flags)
|
||||
{
|
||||
struct zoneref *z;
|
||||
|
|
@ -1388,16 +1388,17 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
|
|||
int zlc_active = 0; /* set if using zonelist_cache */
|
||||
int did_zlc_setup = 0; /* just call zlc_setup() one time */
|
||||
|
||||
z = first_zones_zonelist(zonelist, high_zoneidx);
|
||||
classzone_idx = zonelist_zone_idx(z);
|
||||
preferred_zone = zonelist_zone(z);
|
||||
(void)first_zones_zonelist(zonelist, high_zoneidx, nodemask,
|
||||
&preferred_zone);
|
||||
classzone_idx = zone_idx(preferred_zone);
|
||||
|
||||
zonelist_scan:
|
||||
/*
|
||||
* Scan zonelist, looking for a zone with enough free.
|
||||
* See also cpuset_zone_allowed() comment in kernel/cpuset.c.
|
||||
*/
|
||||
for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
|
||||
for_each_zone_zonelist_nodemask(zone, z, zonelist,
|
||||
high_zoneidx, nodemask) {
|
||||
if (NUMA_BUILD && zlc_active &&
|
||||
!zlc_zone_worth_trying(zonelist, z, allowednodes))
|
||||
continue;
|
||||
|
|
@ -1447,9 +1448,9 @@ try_next_zone:
|
|||
/*
|
||||
* This is the 'heart' of the zoned buddy allocator.
|
||||
*/
|
||||
struct page *
|
||||
__alloc_pages(gfp_t gfp_mask, unsigned int order,
|
||||
struct zonelist *zonelist)
|
||||
static struct page *
|
||||
__alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
|
||||
struct zonelist *zonelist, nodemask_t *nodemask)
|
||||
{
|
||||
const gfp_t wait = gfp_mask & __GFP_WAIT;
|
||||
enum zone_type high_zoneidx = gfp_zone(gfp_mask);
|
||||
|
|
@ -1478,7 +1479,7 @@ restart:
|
|||
return NULL;
|
||||
}
|
||||
|
||||
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
|
||||
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
|
||||
zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET);
|
||||
if (page)
|
||||
goto got_pg;
|
||||
|
|
@ -1523,7 +1524,7 @@ restart:
|
|||
* Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc.
|
||||
* See also cpuset_zone_allowed() comment in kernel/cpuset.c.
|
||||
*/
|
||||
page = get_page_from_freelist(gfp_mask, order, zonelist,
|
||||
page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist,
|
||||
high_zoneidx, alloc_flags);
|
||||
if (page)
|
||||
goto got_pg;
|
||||
|
|
@ -1536,7 +1537,7 @@ rebalance:
|
|||
if (!(gfp_mask & __GFP_NOMEMALLOC)) {
|
||||
nofail_alloc:
|
||||
/* go through the zonelist yet again, ignoring mins */
|
||||
page = get_page_from_freelist(gfp_mask, order,
|
||||
page = get_page_from_freelist(gfp_mask, nodemask, order,
|
||||
zonelist, high_zoneidx, ALLOC_NO_WATERMARKS);
|
||||
if (page)
|
||||
goto got_pg;
|
||||
|
|
@ -1571,7 +1572,7 @@ nofail_alloc:
|
|||
drain_all_pages();
|
||||
|
||||
if (likely(did_some_progress)) {
|
||||
page = get_page_from_freelist(gfp_mask, order,
|
||||
page = get_page_from_freelist(gfp_mask, nodemask, order,
|
||||
zonelist, high_zoneidx, alloc_flags);
|
||||
if (page)
|
||||
goto got_pg;
|
||||
|
|
@ -1587,8 +1588,9 @@ nofail_alloc:
|
|||
* a parallel oom killing, we must fail if we're still
|
||||
* under heavy pressure.
|
||||
*/
|
||||
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
|
||||
zonelist, high_zoneidx, ALLOC_WMARK_HIGH|ALLOC_CPUSET);
|
||||
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask,
|
||||
order, zonelist, high_zoneidx,
|
||||
ALLOC_WMARK_HIGH|ALLOC_CPUSET);
|
||||
if (page) {
|
||||
clear_zonelist_oom(zonelist, gfp_mask);
|
||||
goto got_pg;
|
||||
|
|
@ -1637,6 +1639,20 @@ got_pg:
|
|||
return page;
|
||||
}
|
||||
|
||||
struct page *
|
||||
__alloc_pages(gfp_t gfp_mask, unsigned int order,
|
||||
struct zonelist *zonelist)
|
||||
{
|
||||
return __alloc_pages_internal(gfp_mask, order, zonelist, NULL);
|
||||
}
|
||||
|
||||
struct page *
|
||||
__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
|
||||
struct zonelist *zonelist, nodemask_t *nodemask)
|
||||
{
|
||||
return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(__alloc_pages);
|
||||
|
||||
/*
|
||||
|
|
@ -1880,6 +1896,12 @@ void show_free_areas(void)
|
|||
show_swap_cache_info();
|
||||
}
|
||||
|
||||
static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
|
||||
{
|
||||
zoneref->zone = zone;
|
||||
zoneref->zone_idx = zone_idx(zone);
|
||||
}
|
||||
|
||||
/*
|
||||
* Builds allocation fallback zone lists.
|
||||
*
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче