Alex Chiang wrote:
* Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>:On Thu, 14 Jan 2010, Alex Chiang wrote:coffee0:/usr/src/linux-2.6 # addr2line 0xa0000001001add60 -e vmlinux /usr/src/linux-2.6/include/linux/mm.h:543 538 #ifdef NODE_NOT_IN_PAGE_FLAGS 539 extern int page_to_nid(struct page *page); 540 #else 541 static inline int page_to_nid(struct page *page) 542 { 543 return (page->flags >> NODES_PGSHIFT) & NODES_MASK; 544 } 545 #endifThat may mean that early_kmem_node_alloc gets a screwy page number from the page allocator? ???? Can you print the address of page returned from new_slab() in early_kmem_cache_node_alloc()?diff --git a/mm/slub.c b/mm/slub.c index 9e86e6b..2909cc4 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2062,7 +2062,7 @@ init_kmem_cache_node(struct kmem_cache_node *n, struct kme m_cache *s) #endif }-static DEFINE_PER_CPU(struct kmem_cache_cpu, kmalloc_percpu[SLUB_PAGE_SHIFT]);+static DEFINE_PER_CPU(struct kmem_cache_cpu, kmalloc_percpu[KMALLOC_CACHES]);static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags){ @@ -2100,6 +2100,7 @@ static void early_kmem_cache_node_alloc(gfp_t gfpflags, in t node) BUG_ON(kmalloc_caches->size < sizeof(struct kmem_cache_node));page = new_slab(kmalloc_caches, gfpflags, node);+ printk("page from new_slab() %#llx\n", page);BUG_ON(!page);if (page_to_nid(page) != node) { Memory: 66849344k/66910528k available (8033k code, 110720k reserved, 10805k data, 1984k init) page from new_slab() 0xa07fffffff900000 page from new_slab() 0xa07fffffe39000e0 SLUB: Unable to allocate memory from node 2 SLUB: Allocating a useless per node structure in order to be able to continue SLUB: Genslabs=18, HWalign=128, Order=0-3, MinObjects=0, CPUs=16, Nodes=1024 [...] Unable to handle kernel paging request at virtual address a07ffffe5a7838a8 modprobe[6043]: Oops 8813272891392 [1] Modules linked in: sr_mod(+) sg container(+) button usbhid ohci_hcd ehci_hcd usbcore fan thermal processor thermal_sys Pid: 6043, CPU 9, comm: modprobe psr : 0000101008526010 ifs : 8000000000000b1d ip : [<a0000001001add60>] Not tainted (2.6.33-rc3-next-20100111-dirty) ip is at kmem_cache_open+0x420/0xb40
Christoph, we've seen similar issue on s390: http://git.kernel.org/?p=linux/kernel/git/penberg/slab-2.6.git;a=commitdiff;h=ff64d6c42abaffdb8686c77930eafb4da5b676f5Maybe your changes are trigger a latent bug with DEFINE_PER_CPU handling in SLUB?
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