From de3083ec3e6bfb1ab60bc8a410f37702529f953c Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 27 Sep 2006 01:50:03 -0700 Subject: [PATCH] [PATCH] slab: fix kmalloc_node applying memory policies if nodeid == numa_node_id() kmalloc_node() falls back to ___cache_alloc() under certain conditions and at that point memory policies may be applied redirecting the allocation away from the current node. Therefore kmalloc_node(...,numa_node_id()) or kmalloc_node(...,-1) may not return memory from the local node. Fix this by doing the policy check in __cache_alloc() instead of ____cache_alloc(). This version here is a cleanup of Kiran's patch. - Tested on ia64. - Extra material removed. - Consolidate the exit path if alternate_node_alloc() returned an object. [akpm@osdl.org: warning fix] Signed-off-by: Alok N Kataria Signed-off-by: Ravikiran Thirumalai Signed-off-by: Shai Fultheim Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/slab.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index c52ebf9c446..69e11c45002 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3028,14 +3028,6 @@ static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) void *objp; struct array_cache *ac; -#ifdef CONFIG_NUMA - if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { - objp = alternate_node_alloc(cachep, flags); - if (objp != NULL) - return objp; - } -#endif - check_irq_off(); ac = cpu_cache_get(cachep); if (likely(ac->avail)) { @@ -3053,12 +3045,19 @@ static __always_inline void *__cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller) { unsigned long save_flags; - void *objp; + void *objp = NULL; cache_alloc_debugcheck_before(cachep, flags); local_irq_save(save_flags); - objp = ____cache_alloc(cachep, flags); + +#ifdef CONFIG_NUMA + if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) + objp = alternate_node_alloc(cachep, flags); +#endif + + if (!objp) + objp = ____cache_alloc(cachep, flags); local_irq_restore(save_flags); objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); -- 2.46.0