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[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>
This commit is contained in:
Ravikiran G Thirumalai 2006-03-22 00:08:12 -08:00 committed by Linus Torvalds
parent a737b3e2fc
commit b5d8ca7c50
1 changed files with 9 additions and 11 deletions
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20
mm/slab.c
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@ -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;
}