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Date: Mon, 28 Mar 2016 14:26:55 +0900
From: js1304@...il.com
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 05/11] mm/slab: clean-up kmem_cache_node setup
From: Joonsoo Kim <iamjoonsoo.kim@....com>
There are mostly same code for setting up kmem_cache_node either
in cpuup_prepare() or alloc_kmem_cache_node(). Factor out and
clean-up them.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
mm/slab.c | 167 +++++++++++++++++++++++++-------------------------------------
1 file changed, 67 insertions(+), 100 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 569d7db..b96f381 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -898,6 +898,62 @@ static int init_cache_node_node(int node)
return 0;
}
+static int setup_kmem_cache_node(struct kmem_cache *cachep,
+ int node, gfp_t gfp, bool force_change)
+{
+ int ret = -ENOMEM;
+ struct kmem_cache_node *n;
+ struct array_cache *old_shared = NULL;
+ struct array_cache *new_shared = NULL;
+ struct alien_cache **new_alien = NULL;
+ LIST_HEAD(list);
+
+ if (use_alien_caches) {
+ new_alien = alloc_alien_cache(node, cachep->limit, gfp);
+ if (!new_alien)
+ goto fail;
+ }
+
+ if (cachep->shared) {
+ new_shared = alloc_arraycache(node,
+ cachep->shared * cachep->batchcount, 0xbaadf00d, gfp);
+ if (!new_shared)
+ goto fail;
+ }
+
+ ret = init_cache_node(cachep, node, gfp);
+ if (ret)
+ goto fail;
+
+ n = get_node(cachep, node);
+ spin_lock_irq(&n->list_lock);
+ if (n->shared) {
+ free_block(cachep, n->shared->entry,
+ n->shared->avail, node, &list);
+ }
+
+ if (!n->shared || force_change) {
+ old_shared = n->shared;
+ n->shared = new_shared;
+ new_shared = NULL;
+ }
+
+ if (!n->alien) {
+ n->alien = new_alien;
+ new_alien = NULL;
+ }
+
+ spin_unlock_irq(&n->list_lock);
+ slabs_destroy(cachep, &list);
+
+fail:
+ kfree(old_shared);
+ kfree(new_shared);
+ free_alien_cache(new_alien);
+
+ return ret;
+}
+
static void cpuup_canceled(long cpu)
{
struct kmem_cache *cachep;
@@ -969,7 +1025,6 @@ free_slab:
static int cpuup_prepare(long cpu)
{
struct kmem_cache *cachep;
- struct kmem_cache_node *n = NULL;
int node = cpu_to_mem(cpu);
int err;
@@ -988,44 +1043,9 @@ static int cpuup_prepare(long cpu)
* array caches
*/
list_for_each_entry(cachep, &slab_caches, list) {
- struct array_cache *shared = NULL;
- struct alien_cache **alien = NULL;
-
- if (cachep->shared) {
- shared = alloc_arraycache(node,
- cachep->shared * cachep->batchcount,
- 0xbaadf00d, GFP_KERNEL);
- if (!shared)
- goto bad;
- }
- if (use_alien_caches) {
- alien = alloc_alien_cache(node, cachep->limit, GFP_KERNEL);
- if (!alien) {
- kfree(shared);
- goto bad;
- }
- }
- n = get_node(cachep, node);
- BUG_ON(!n);
-
- spin_lock_irq(&n->list_lock);
- if (!n->shared) {
- /*
- * We are serialised from CPU_DEAD or
- * CPU_UP_CANCELLED by the cpucontrol lock
- */
- n->shared = shared;
- shared = NULL;
- }
-#ifdef CONFIG_NUMA
- if (!n->alien) {
- n->alien = alien;
- alien = NULL;
- }
-#endif
- spin_unlock_irq(&n->list_lock);
- kfree(shared);
- free_alien_cache(alien);
+ err = setup_kmem_cache_node(cachep, node, GFP_KERNEL, false);
+ if (err)
+ goto bad;
}
return 0;
@@ -3652,72 +3672,19 @@ EXPORT_SYMBOL(kfree);
/*
* This initializes kmem_cache_node or resizes various caches for all nodes.
*/
-static int alloc_kmem_cache_node(struct kmem_cache *cachep, gfp_t gfp)
+static int setup_kmem_cache_node_node(struct kmem_cache *cachep, gfp_t gfp)
{
+ int ret;
int node;
struct kmem_cache_node *n;
- struct array_cache *new_shared;
- struct alien_cache **new_alien = NULL;
for_each_online_node(node) {
-
- if (use_alien_caches) {
- new_alien = alloc_alien_cache(node, cachep->limit, gfp);
- if (!new_alien)
- goto fail;
- }
-
- new_shared = NULL;
- if (cachep->shared) {
- new_shared = alloc_arraycache(node,
- cachep->shared*cachep->batchcount,
- 0xbaadf00d, gfp);
- if (!new_shared) {
- free_alien_cache(new_alien);
- goto fail;
- }
- }
-
- n = get_node(cachep, node);
- if (n) {
- struct array_cache *shared = n->shared;
- LIST_HEAD(list);
-
- spin_lock_irq(&n->list_lock);
-
- if (shared)
- free_block(cachep, shared->entry,
- shared->avail, node, &list);
-
- n->shared = new_shared;
- if (!n->alien) {
- n->alien = new_alien;
- new_alien = NULL;
- }
- n->free_limit = (1 + nr_cpus_node(node)) *
- cachep->batchcount + cachep->num;
- spin_unlock_irq(&n->list_lock);
- slabs_destroy(cachep, &list);
- kfree(shared);
- free_alien_cache(new_alien);
- continue;
- }
- n = kmalloc_node(sizeof(struct kmem_cache_node), gfp, node);
- if (!n) {
- free_alien_cache(new_alien);
- kfree(new_shared);
+ ret = setup_kmem_cache_node(cachep, node, gfp, true);
+ if (ret)
goto fail;
- }
- kmem_cache_node_init(n);
- n->next_reap = jiffies + REAPTIMEOUT_NODE +
- ((unsigned long)cachep) % REAPTIMEOUT_NODE;
- n->shared = new_shared;
- n->alien = new_alien;
- n->free_limit = (1 + nr_cpus_node(node)) *
- cachep->batchcount + cachep->num;
- cachep->node[node] = n;
}
+
return 0;
fail:
@@ -3759,7 +3726,7 @@ static int __do_tune_cpucache(struct kmem_cache *cachep, int limit,
cachep->shared = shared;
if (!prev)
- goto alloc_node;
+ goto setup_node;
for_each_online_cpu(cpu) {
LIST_HEAD(list);
@@ -3776,8 +3743,8 @@ static int __do_tune_cpucache(struct kmem_cache *cachep, int limit,
}
free_percpu(prev);
-alloc_node:
- return alloc_kmem_cache_node(cachep, gfp);
+setup_node:
+ return setup_kmem_cache_node_node(cachep, gfp);
}
static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
--
1.9.1
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