From 756dee75872a2a764b478e18076360b8a4ec9045 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Fri, 18 Dec 2009 16:26:21 -0600 Subject: SLUB: Get rid of dynamic DMA kmalloc cache allocation Dynamic DMA kmalloc cache allocation is troublesome since the new percpu allocator does not support allocations in atomic contexts. Reserve some statically allocated kmalloc_cpu structures instead. Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slub.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) (limited to 'mm/slub.c') diff --git a/mm/slub.c b/mm/slub.c index d6c9ecf629d5..cdb7f0214af0 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2092,7 +2092,7 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags) { int cpu; - if (s < kmalloc_caches + SLUB_PAGE_SHIFT && s >= kmalloc_caches) + if (s < kmalloc_caches + KMALLOC_CACHES && s >= kmalloc_caches) /* * Boot time creation of the kmalloc array. Use static per cpu data * since the per cpu allocator is not available yet. @@ -2539,7 +2539,7 @@ EXPORT_SYMBOL(kmem_cache_destroy); * Kmalloc subsystem *******************************************************************/ -struct kmem_cache kmalloc_caches[SLUB_PAGE_SHIFT] __cacheline_aligned; +struct kmem_cache kmalloc_caches[KMALLOC_CACHES] __cacheline_aligned; EXPORT_SYMBOL(kmalloc_caches); static int __init setup_slub_min_order(char *str) @@ -2629,6 +2629,7 @@ static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags) char *text; size_t realsize; unsigned long slabflags; + int i; s = kmalloc_caches_dma[index]; if (s) @@ -2649,18 +2650,13 @@ static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags) text = kasprintf(flags & ~SLUB_DMA, "kmalloc_dma-%d", (unsigned int)realsize); - if (flags & __GFP_WAIT) - s = kmalloc(kmem_size, flags & ~SLUB_DMA); - else { - int i; + s = NULL; + for (i = 0; i < KMALLOC_CACHES; i++) + if (!kmalloc_caches[i].size) + break; - s = NULL; - for (i = 0; i < SLUB_PAGE_SHIFT; i++) - if (kmalloc_caches[i].size) { - s = kmalloc_caches + i; - break; - } - } + BUG_ON(i >= KMALLOC_CACHES); + s = kmalloc_caches + i; /* * Must defer sysfs creation to a workqueue because we don't know @@ -2674,7 +2670,7 @@ static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags) if (!s || !text || !kmem_cache_open(s, flags, text, realsize, ARCH_KMALLOC_MINALIGN, slabflags, NULL)) { - kfree(s); + s->size = 0; kfree(text); goto unlock_out; } -- cgit v1.2.1