[Andrew, I have been unable to find a NUMA-capable tester for this patch,
so can we please put this in to -mm for some exposure?]
From: Pekka Enberg <[email protected]>
This patch cleans up __cache_alloc and __cache_alloc_node functions. We no
longer need to do NUMA_BUILD tricks and the UMA allocation path is much
simpler. Note: we now do alternate_node_alloc() for kmem_cache_alloc_node as
well.
Cc: Andy Whitcroft <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Manfred Spraul <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Paul Jackson <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
---
mm/slab.c | 165 +++++++++++++++++++++++++++++++-------------------------------
1 file changed, 84 insertions(+), 81 deletions(-)
Index: 2.6/mm/slab.c
===================================================================
--- 2.6.orig/mm/slab.c
+++ 2.6/mm/slab.c
@@ -3197,35 +3197,6 @@ static inline void *____cache_alloc(stru
return objp;
}
-static __always_inline void *__cache_alloc(struct kmem_cache *cachep,
- gfp_t flags, void *caller)
-{
- unsigned long save_flags;
- void *objp = NULL;
-
- cache_alloc_debugcheck_before(cachep, flags);
-
- local_irq_save(save_flags);
-
- if (unlikely(NUMA_BUILD &&
- current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY)))
- objp = alternate_node_alloc(cachep, flags);
-
- if (!objp)
- objp = ____cache_alloc(cachep, flags);
- /*
- * We may just have run out of memory on the local node.
- * ____cache_alloc_node() knows how to locate memory on other nodes
- */
- if (NUMA_BUILD && !objp)
- objp = ____cache_alloc_node(cachep, flags, numa_node_id());
- local_irq_restore(save_flags);
- objp = cache_alloc_debugcheck_after(cachep, flags, objp,
- caller);
- prefetchw(objp);
- return objp;
-}
-
#ifdef CONFIG_NUMA
/*
* Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY.
@@ -3383,7 +3354,90 @@ must_grow:
done:
return obj;
}
-#endif
+
+/**
+ * __do_cache_alloc_node - Allocate an object on the specified node
+ * @cachep: The cache to allocate from.
+ * @flags: See kmalloc().
+ * @nodeid: node number of the target node.
+ *
+ * Fallback to other node is possible if __GFP_THISNODE is not set.
+ */
+static __always_inline void *
+__do_cache_alloc_node(struct kmem_cache *cache, gfp_t flags, int nodeid)
+{
+ void *obj;
+
+ if (nodeid == -1 || nodeid == numa_node_id()) {
+ if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) {
+ obj = alternate_node_alloc(cache, flags);
+ if (obj)
+ goto out;
+ }
+
+ /*
+ * Use the locally cached objects if possible. However,
+ * ____cache_alloc does not allow fallback to other nodes.
+ * It may fail while we still have objects on other nodes
+ * available.
+ */
+ obj = ____cache_alloc(cache, flags);
+ if (obj)
+ goto out;
+
+ /* Fall back to other nodes. */
+ obj = ____cache_alloc_node(cache, flags, numa_node_id());
+ } else {
+ if (likely(cache->nodelists[nodeid]))
+ obj = ____cache_alloc_node(cache, flags, nodeid);
+ else {
+ /* Node is not bootstrapped yet. */
+ if (!(flags & __GFP_THISNODE))
+ obj = fallback_alloc(cache, flags);
+ else
+ obj = NULL;
+ }
+ }
+ out:
+ return obj;
+}
+
+#else
+
+static __always_inline void *
+__do_cache_alloc_node(struct kmem_cache *cache, gfp_t flags, int nodeid)
+{
+ /*
+ * For UMA, we always allocate from the local cache.
+ */
+ return ____cache_alloc(cache, flags);
+}
+#endif /* CONFIG_NUMA */
+
+static __always_inline void *
+__cache_alloc_node(struct kmem_cache *cache, gfp_t flags, int nodeid,
+ void *caller)
+{
+ unsigned long save_flags;
+ void *obj;
+
+ cache_alloc_debugcheck_before(cache, flags);
+ local_irq_save(save_flags);
+ obj = __do_cache_alloc_node(cache, flags, nodeid);
+ local_irq_restore(save_flags);
+ obj = cache_alloc_debugcheck_after(cache, flags, obj, caller);
+ return obj;
+}
+
+static __always_inline void *
+__cache_alloc(struct kmem_cache *cache, gfp_t flags, void *caller)
+{
+ void *obj;
+
+ obj = __cache_alloc_node(cache, flags, -1, caller);
+ prefetchw(obj);
+ return obj;
+}
/*
* Caller needs to acquire correct kmem_list's list_lock
@@ -3582,57 +3636,6 @@ out:
}
#ifdef CONFIG_NUMA
-/**
- * kmem_cache_alloc_node - Allocate an object on the specified node
- * @cachep: The cache to allocate from.
- * @flags: See kmalloc().
- * @nodeid: node number of the target node.
- * @caller: return address of caller, used for debug information
- *
- * Identical to kmem_cache_alloc but it will allocate memory on the given
- * node, which can improve the performance for cpu bound structures.
- *
- * Fallback to other node is possible if __GFP_THISNODE is not set.
- */
-static __always_inline void *
-__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
- int nodeid, void *caller)
-{
- unsigned long save_flags;
- void *ptr = NULL;
-
- cache_alloc_debugcheck_before(cachep, flags);
- local_irq_save(save_flags);
-
- if (unlikely(nodeid == -1))
- nodeid = numa_node_id();
-
- if (likely(cachep->nodelists[nodeid])) {
- if (nodeid == numa_node_id()) {
- /*
- * Use the locally cached objects if possible.
- * However ____cache_alloc does not allow fallback
- * to other nodes. It may fail while we still have
- * objects on other nodes available.
- */
- ptr = ____cache_alloc(cachep, flags);
- }
- if (!ptr) {
- /* ___cache_alloc_node can fall back to other nodes */
- ptr = ____cache_alloc_node(cachep, flags, nodeid);
- }
- } else {
- /* Node not bootstrapped yet */
- if (!(flags & __GFP_THISNODE))
- ptr = fallback_alloc(cachep, flags);
- }
-
- local_irq_restore(save_flags);
- ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller);
-
- return ptr;
-}
-
void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
{
return __cache_alloc_node(cachep, flags, nodeid,
-
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