[PATCH] slab: remove cachep->spinlock

Remove cachep->spinlock.  Locking has moved to the kmem_list3 and most of
the structures protected earlier by cachep->spinlock is now protected by
the l3->list_lock.  slab cache tunables like batchcount are accessed always
with the cache_chain_mutex held.

Patch tested on SMP and NUMA kernels with dbench processes running,
constant onlining/offlining, and constant cache tuning, all at the same
time.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Cc: Christoph Lameter <christoph@lameter.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 11 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 7b6f9f10e757..2cd80203984b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -372,17 +372,19 @@ static void kmem_list3_init(struct kmem_list3 *parent)
 struct kmem_cache {
 /* 1) per-cpu data, touched during every alloc/free */
         struct array_cache *array[NR_CPUS];
+/* 2) Cache tunables. Protected by cache_chain_mutex */
         unsigned int batchcount;
         unsigned int limit;
         unsigned int shared;
+
         unsigned int buffer_size;
-/* 2) touched by every alloc & free from the backend */
+/* 3) touched by every alloc & free from the backend */
         struct kmem_list3 *nodelists[MAX_NUMNODES];
+
         unsigned int flags;             /* constant flags */
         unsigned int num;               /* # of objs per slab */
-        spinlock_t spinlock;
 
-/* 3) cache_grow/shrink */
+/* 4) cache_grow/shrink */
         /* order of pgs per slab (2^n) */
         unsigned int gfporder;
 
@@ -401,11 +403,11 @@ struct kmem_cache {
         /* de-constructor func */
         void (*dtor) (void *, struct kmem_cache *, unsigned long);
 
-/* 4) cache creation/removal */
+/* 5) cache creation/removal */
         const char *name;
         struct list_head next;
 
-/* 5) statistics */
+/* 6) statistics */
 #if STATS
         unsigned long num_active;
         unsigned long num_allocations;
@@ -661,7 +663,6 @@ static struct kmem_cache cache_cache = {
         .shared = 1,
         .buffer_size = sizeof(struct kmem_cache),
         .flags = SLAB_NO_REAP,
-        .spinlock = SPIN_LOCK_UNLOCKED,
         .name = "kmem_cache",
 #if DEBUG
         .obj_size = sizeof(struct kmem_cache),
@@ -2057,7 +2058,6 @@ kmem_cache_create (const char *name, size_t size, size_t align,
         cachep->gfpflags = 0;
         if (flags & SLAB_CACHE_DMA)
                 cachep->gfpflags |= GFP_DMA;
-        spin_lock_init(&cachep->spinlock);
         cachep->buffer_size = size;
 
         if (flags & CFLGS_OFF_SLAB)
@@ -3425,6 +3425,7 @@ static void do_ccupdate_local(void *info)
         new->new[smp_processor_id()] = old;
 }
 
+/* Always called with the cache_chain_mutex held */
 static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
                                 int batchcount, int shared)
 {
@@ -3446,11 +3447,9 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
         smp_call_function_all_cpus(do_ccupdate_local, (void *)&new);
 
         check_irq_on();
-        spin_lock(&cachep->spinlock);
         cachep->batchcount = batchcount;
         cachep->limit = limit;
         cachep->shared = shared;
-        spin_unlock(&cachep->spinlock);
 
         for_each_online_cpu(i) {
                 struct array_cache *ccold = new.new[i];
@@ -3471,6 +3470,7 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
         return 0;
 }
 
+/* Called with cache_chain_mutex held always */
 static void enable_cpucache(struct kmem_cache *cachep)
 {
         int err;
@@ -3705,7 +3705,6 @@ static int s_show(struct seq_file *m, void *p)
         int node;
         struct kmem_list3 *l3;
 
-        spin_lock(&cachep->spinlock);
         active_objs = 0;
         num_slabs = 0;
         for_each_online_node(node) {
@@ -3788,7 +3787,6 @@ static int s_show(struct seq_file *m, void *p)
         }
 #endif
         seq_putc(m, '\n');
-        spin_unlock(&cachep->spinlock);
         return 0;
 }