Hi Sachin,
On Fri, 5 Jun 2009, Sachin Sant wrote:
> I can still recreate this bug on a Power 6 hardware with today's next tree.
> I can recreate this problem at will.
> Let me know if i can help in debugging this problem.
Can you please reproduce the issue with this debugging patch applied and
post the result?
Pekka
>From 27189e1e1d2890e98cb029bd1121c86b8c53ecd9 Mon Sep 17 00:00:00 2001
From: Pekka Enberg <penb...@cs.helsinki.fi>
Date: Sun, 7 Jun 2009 11:03:50 +0300
Subject: [PATCH] slqb: debugging
Signed-off-by: Pekka Enberg <penb...@cs.helsinki.fi>
---
mm/slqb.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/mm/slqb.c b/mm/slqb.c
index 29bb005..dce39d4 100644
--- a/mm/slqb.c
+++ b/mm/slqb.c
@@ -1382,6 +1382,8 @@ static noinline void *__slab_alloc_page(struct kmem_cache
*s,
l = &c->list;
page->list = l;
+ printk(KERN_INFO "%s: cpu=%d, cache_cpu=%p, cache_list=%p\n",
__func__, cpu, c, l);
+
spin_lock(&l->page_lock);
l->nr_slabs++;
l->nr_partial++;
@@ -1393,11 +1395,15 @@ static noinline void *__slab_alloc_page(struct
kmem_cache *s,
} else {
#ifdef CONFIG_NUMA
struct kmem_cache_node *n;
+ int nid;
- n = s->node_slab[slqb_page_to_nid(page)];
+ nid = slqb_page_to_nid(page);
+ n = s->node_slab[nid];
l = &n->list;
page->list = l;
+ printk(KERN_INFO "%s: nid=%d, cache_node=%p, cache_list=%p\n",
__func__, nid, n, l);
+
spin_lock(&n->list_lock);
spin_lock(&l->page_lock);
l->nr_slabs++;
@@ -2028,6 +2034,8 @@ static void free_kmem_cache_nodes(struct kmem_cache *s)
for_each_node_state(node, N_NORMAL_MEMORY) {
struct kmem_cache_node *n;
+ printk(KERN_INFO "%s: cache=%s, node=%d\n", __func__, s->name,
node);
+
n = s->node_slab[node];
if (n) {
kmem_cache_free(&kmem_node_cache, n);
@@ -2043,8 +2051,11 @@ static int alloc_kmem_cache_nodes(struct kmem_cache *s)
for_each_node_state(node, N_NORMAL_MEMORY) {
struct kmem_cache_node *n;
+ printk(KERN_INFO "%s: cache=%s, node=%d\n", __func__, s->name,
node);
+
n = kmem_cache_alloc_node(&kmem_node_cache, GFP_KERNEL, node);
if (!n) {
+ printk(KERN_INFO "%s: %s: kmem_cache_alloc_node()
failed for node %d\n", __func__, s->name, node);
free_kmem_cache_nodes(s);
return 0;
}
--
1.5.6.4
>
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