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SubjectRe: NUMA aware slab allocator V2
On Wed, May 11, 2005 at 08:17:08AM -0700, Christoph Lameter wrote:
> The NUMA API change that introduced kmalloc_node was accepted last week by
> Linus. Now it is possible to do slab allocations on a node to localize
> memory structures. This API was used by the pageset localization patch and
> the block layer localization patch now in mm. The existing kmalloc_node is
> slow since it simply searches through all pages of the slab to find a page
> that is on the node requested. The two patches do a one time allocation of
> slab structures at initialization and therefore the speed of kmalloc node
> does not matter.

Christoph -

The results look good. One suggestion though. When you make a series of AIM7
runs, include more points at the low end of the curve. We need to verify
that changes don't cause regressions for small numbers of users.
Even better, if a change helps the low end, that is important to know, too.


>
> This patch allows kmalloc_node to be as fast as kmalloc by introducing
> node specific page lists for partial, free and full slabs. Slab allocation
> improves in a NUMA system so that we are seeing a performance gain in
> AIM7 of about 5% with this patch alone.
>
> More NUMA localizations are possible if kmalloc_node operates
> in an fast way like kmalloc.
>
> Test run on a 32p systems with 32G Ram.
>
> w/o patch
> Tasks jobs/min jti jobs/min/task real cpu
> 1 485.36 100 485.3640 11.99 1.91 Sat Apr 30 14:01:51 2005
> 100 26582.63 88 265.8263 21.89 144.96 Sat Apr 30 14:02:14 2005
> 200 29866.83 81 149.3342 38.97 286.08 Sat Apr 30 14:02:53 2005
> 300 33127.16 78 110.4239 52.71 426.54 Sat Apr 30 14:03:46 2005
> 400 34889.47 80 87.2237 66.72 568.90 Sat Apr 30 14:04:53 2005
> 500 35654.34 76 71.3087 81.62 714.55 Sat Apr 30 14:06:15 2005
> 600 36460.83 75 60.7681 95.77 853.42 Sat Apr 30 14:07:51 2005
> 700 35957.00 75 51.3671 113.30 990.67 Sat Apr 30 14:09:45 2005
> 800 33380.65 73 41.7258 139.48 1140.86 Sat Apr 30 14:12:05 2005
> 900 35095.01 76 38.9945 149.25 1281.30 Sat Apr 30 14:14:35 2005
> 1000 36094.37 74 36.0944 161.24 1419.66 Sat Apr 30 14:17:17 2005
>
> w/patch
> Tasks jobs/min jti jobs/min/task real cpu
> 1 484.27 100 484.2736 12.02 1.93 Sat Apr 30 15:59:45 2005
> 100 28262.03 90 282.6203 20.59 143.57 Sat Apr 30 16:00:06 2005
> 200 32246.45 82 161.2322 36.10 282.89 Sat Apr 30 16:00:42 2005
> 300 37945.80 83 126.4860 46.01 418.75 Sat Apr 30 16:01:28 2005
> 400 40000.69 81 100.0017 58.20 561.48 Sat Apr 30 16:02:27 2005
> 500 40976.10 78 81.9522 71.02 696.95 Sat Apr 30 16:03:38 2005
> 600 41121.54 78 68.5359 84.92 834.86 Sat Apr 30 16:05:04 2005
> 700 44052.77 78 62.9325 92.48 971.53 Sat Apr 30 16:06:37 2005
> 800 41066.89 79 51.3336 113.38 1111.15 Sat Apr 30 16:08:31 2005
> 900 38918.77 79 43.2431 134.59 1252.57 Sat Apr 30 16:10:46 2005
> 1000 41842.21 76 41.8422 139.09 1392.33 Sat Apr 30 16:13:05 2005
>
> These are measurement taken directly after boot and show a greater improvement than 5%.
> However, the performance improvements become less over time if the AIM7 runs are repeated
> and settle down at around 5%.
>
> Link to earlier discussions:
> http://marc.theaimsgroup.com/?t=111094594500003&r=1&w=2
>
> Changelog:
> - Batching for freeing of wrong-node objects (alien caches)
> - Locking changes and NUMA #ifdefs as requested by Manfred
>
> Signed-off-by: Alok N Kataria <alokk@calsoftinc.com>
> Signed-off-by: Shobhit Dayal <shobhit@calsoftinc.com>
> Signed-off-by: Shai Fultheim <Shai@Scalex86.org>
> Signed-off-by: Christoph Lameter <clameter@sgi.com>
>
> Index: linux-2.6.11/mm/slab.c
> ===================================================================
> --- linux-2.6.11.orig/mm/slab.c 2005-04-30 11:41:28.000000000 -0700
> +++ linux-2.6.11/mm/slab.c 2005-05-04 09:18:16.000000000 -0700
> @@ -75,6 +75,13 @@
> *
> * At present, each engine can be growing a cache. This should be blocked.
> *
> + * 15 March 2005. NUMA slab allocator.
> + * Shobhit Dayal <shobhit@calsoftinc.com>
> + * Alok N Kataria <alokk@calsoftinc.com>
> + *
> + * Modified the slab allocator to be node aware on NUMA systems.
> + * Each node has its own list of partial, free and full slabs.
> + * All object allocations for a node occur from node specific slab lists.
> */
>
> #include <linux/config.h>
> @@ -92,7 +99,7 @@
> #include <linux/sysctl.h>
> #include <linux/module.h>
> #include <linux/rcupdate.h>
> -
> +#include <linux/nodemask.h>
> #include <asm/uaccess.h>
> #include <asm/cacheflush.h>
> #include <asm/tlbflush.h>
> @@ -210,6 +217,9 @@ struct slab {
> void *s_mem; /* including colour offset */
> unsigned int inuse; /* num of objs active in slab */
> kmem_bufctl_t free;
> +#ifdef CONFIG_NUMA
> + unsigned short nodeid;
> +#endif
> };
>
> /*
> @@ -252,6 +262,10 @@ struct array_cache {
> unsigned int limit;
> unsigned int batchcount;
> unsigned int touched;
> +#ifdef CONFIG_NUMA
> + spinlock_t lock;
> +#endif
> + void *entry[];
> };
>
> /* bootstrap: The caches do not work without cpuarrays anymore,
> @@ -275,24 +289,77 @@ struct kmem_list3 {
> struct list_head slabs_full;
> struct list_head slabs_free;
> unsigned long free_objects;
> - int free_touched;
> unsigned long next_reap;
> + int free_touched;
> + unsigned int free_limit;
> + spinlock_t list_lock;
> struct array_cache *shared;
> +#ifdef CONFIG_NUMA
> + struct array_cache **alien;
> +#endif
> };
>
> +/*
> + * Need this for bootstrapping a per node allocator.
> + */
> +#define NUM_INIT_LISTS 3
> +struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS];
> +struct kmem_list3 __initdata kmem64_list3[MAX_NUMNODES];
> +
> +#ifdef CONFIG_NUMA
> +
> #define LIST3_INIT(parent) \
> - { \
> - .slabs_full = LIST_HEAD_INIT(parent.slabs_full), \
> - .slabs_partial = LIST_HEAD_INIT(parent.slabs_partial), \
> - .slabs_free = LIST_HEAD_INIT(parent.slabs_free) \
> - }
> + do { \
> + INIT_LIST_HEAD(&(parent)->slabs_full); \
> + INIT_LIST_HEAD(&(parent)->slabs_partial); \
> + INIT_LIST_HEAD(&(parent)->slabs_free); \
> + (parent)->shared = NULL; \
> + (parent)->alien = NULL; \
> + (parent)->list_lock = SPIN_LOCK_UNLOCKED; \
> + (parent)->free_objects = 0; \
> + (parent)->free_touched = 0; \
> + } while(0)
> +#else
> +
> +#define LIST3_INIT(parent) \
> + do { \
> + INIT_LIST_HEAD(&(parent)->slabs_full); \
> + INIT_LIST_HEAD(&(parent)->slabs_partial); \
> + INIT_LIST_HEAD(&(parent)->slabs_free); \
> + (parent)->shared = NULL; \
> + (parent)->list_lock = SPIN_LOCK_UNLOCKED; \
> + (parent)->free_objects = 0; \
> + (parent)->free_touched = 0; \
> + } while(0)
> +#endif
> +
> +#define MAKE_LIST(cachep, listp, slab, nodeid) \
> + do { \
> + INIT_LIST_HEAD(listp); \
> + list_splice(&(cachep->nodelists[nodeid]->slab), listp); \
> + }while(0)
> +
> +#define MAKE_ALL_LISTS(cachep, ptr, nodeid) \
> + do { \
> + MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid); \
> + MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \
> + MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \
> + }while(0)
> +
> #define list3_data(cachep) \
> - (&(cachep)->lists)
> + ((cachep->nodelists[numa_node_id()]))
>
> /* NUMA: per-node */
> #define list3_data_ptr(cachep, ptr) \
> list3_data(cachep)
>
> +#ifdef CONFIG_NUMA
> +#define is_node_online(node) node_online(node)
> +#else
> +#define is_node_online(node) \
> + ({ BUG_ON(node != 0); 1; })
> +#endif /* CONFIG_NUMA */
> +
> /*
> * kmem_cache_t
> *
> @@ -304,13 +371,12 @@ struct kmem_cache_s {
> struct array_cache *array[NR_CPUS];
> unsigned int batchcount;
> unsigned int limit;
> -/* 2) touched by every alloc & free from the backend */
> - struct kmem_list3 lists;
> - /* NUMA: kmem_3list_t *nodelists[MAX_NUMNODES] */
> + unsigned int shared;
> unsigned int objsize;
> +/* 2) 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 */
> - unsigned int free_limit; /* upper limit of objects in the lists */
> spinlock_t spinlock;
>
> /* 3) cache_grow/shrink */
> @@ -347,6 +413,7 @@ struct kmem_cache_s {
> unsigned long errors;
> unsigned long max_freeable;
> unsigned long node_allocs;
> + unsigned long node_frees;
> atomic_t allochit;
> atomic_t allocmiss;
> atomic_t freehit;
> @@ -382,6 +449,7 @@ struct kmem_cache_s {
> } while (0)
> #define STATS_INC_ERR(x) ((x)->errors++)
> #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++)
> +#define STATS_INC_NODEFREES(x) ((x)->node_frees++)
> #define STATS_SET_FREEABLE(x, i) \
> do { if ((x)->max_freeable < i) \
> (x)->max_freeable = i; \
> @@ -400,6 +468,7 @@ struct kmem_cache_s {
> #define STATS_SET_HIGH(x) do { } while (0)
> #define STATS_INC_ERR(x) do { } while (0)
> #define STATS_INC_NODEALLOCS(x) do { } while (0)
> +#define STATS_INC_NODEFREES(x) do { } while (0)
> #define STATS_SET_FREEABLE(x, i) \
> do { } while (0)
>
> @@ -532,9 +601,9 @@ static struct arraycache_init initarray_
>
> /* internal cache of cache description objs */
> static kmem_cache_t cache_cache = {
> - .lists = LIST3_INIT(cache_cache.lists),
> .batchcount = 1,
> .limit = BOOT_CPUCACHE_ENTRIES,
> + .shared = 1,
> .objsize = sizeof(kmem_cache_t),
> .flags = SLAB_NO_REAP,
> .spinlock = SPIN_LOCK_UNLOCKED,
> @@ -567,16 +636,20 @@ static enum {
> FULL
> } g_cpucache_up;
>
> +static enum {
> + CACHE_CACHE,
> + SIZE_32,
> + SIZE_DMA_32,
> + SIZE_64,
> + ALL
> +} cpucache_up_64;
> +
> static DEFINE_PER_CPU(struct work_struct, reap_work);
>
> static void free_block(kmem_cache_t* cachep, void** objpp, int len);
> static void enable_cpucache (kmem_cache_t *cachep);
> static void cache_reap (void *unused);
> -
> -static inline void **ac_entry(struct array_cache *ac)
> -{
> - return (void**)(ac+1);
> -}
> +static int __node_shrink(kmem_cache_t *cachep, int node);
>
> static inline struct array_cache *ac_data(kmem_cache_t *cachep)
> {
> @@ -678,42 +751,151 @@ static struct array_cache *alloc_arrayca
> int memsize = sizeof(void*)*entries+sizeof(struct array_cache);
> struct array_cache *nc = NULL;
>
> - if (cpu == -1)
> - nc = kmalloc(memsize, GFP_KERNEL);
> - else
> - nc = kmalloc_node(memsize, GFP_KERNEL, cpu_to_node(cpu));
> -
> + nc = kmalloc_node(memsize, GFP_KERNEL, cpu_to_node(cpu));
> if (nc) {
> nc->avail = 0;
> nc->limit = entries;
> nc->batchcount = batchcount;
> nc->touched = 0;
> +#ifdef CONFIG_NUMA
> + spin_lock_init(&nc->lock);
> +#endif
> }
> return nc;
> }
> +#ifdef CONFIG_NUMA
> +static inline struct array_cache **alloc_alien_cache(int cpu, int limit)
> +{
> + struct array_cache **ac_ptr;
> + int memsize = sizeof(void*)*MAX_NUMNODES;
> + int node = cpu_to_node(cpu);
> + int i;
> +
> + if (limit > 1)
> + limit = 12;
> + ac_ptr = kmalloc_node(memsize, GFP_KERNEL, node);
> + if(ac_ptr) {
> + for (i = 0; i < MAX_NUMNODES; i++) {
> + if (i == node) {
> + ac_ptr[i] = NULL;
> + continue;
> + }
> + ac_ptr[i] = alloc_arraycache(cpu, limit, 0xbaadf00d);
> + if(!ac_ptr[i]) {
> + for(i--; i <=0; i--)
> + kfree(ac_ptr[i]);
> + kfree(ac_ptr);
> + return NULL;
> + }
> + }
> + }
> + return ac_ptr;
> +}
> +
> +static inline void free_alien_cache(struct array_cache **ac_ptr)
> +{
> + int i;
> +
> + if(!ac_ptr)
> + return;
> + for (i = 0; i < MAX_NUMNODES; i++)
> + kfree(ac_ptr[i]);
> +
> + kfree(ac_ptr);
> +}
> +
> +static inline void __drain_alien_cache(kmem_cache_t *cachep, struct array_cache *ac, int node)
> +{
> + struct kmem_list3 *rl3 = cachep->nodelists[node];
> +
> + if(ac->avail) {
> + spin_lock(&rl3->list_lock);
> + free_block(cachep, ac->entry, ac->avail);
> + ac->avail = 0;
> + spin_unlock(&rl3->list_lock);
> + }
> +}
> +
> +static void drain_alien_cache(kmem_cache_t *cachep, struct kmem_list3 *l3)
> +{
> + int i=0;
> + struct array_cache *ac;
> + unsigned long flags;
> +
> + for (i = 0; i < MAX_NUMNODES; i++) {
> + ac = l3->alien[i];
> + if(ac) {
> + spin_lock_irqsave(&ac->lock, flags);
> + __drain_alien_cache(cachep, ac, i);
> + spin_unlock_irqrestore(&ac->lock, flags);
> + }
> + }
> +}
> +#endif
>
> static int __devinit cpuup_callback(struct notifier_block *nfb,
> unsigned long action, void *hcpu)
> {
> long cpu = (long)hcpu;
> kmem_cache_t* cachep;
> + struct kmem_list3 *l3 = NULL;
> + int node = cpu_to_node(cpu);
> + int memsize = sizeof(struct kmem_list3);
> + struct array_cache *nc = NULL;
>
> switch (action) {
> case CPU_UP_PREPARE:
> down(&cache_chain_sem);
> + /* we need to do this right in the begining since
> + * alloc_arraycache's are going to use this list.
> + * kmalloc_node allows us to add the slab to the right
> + * kmem_list3 and not this cpu's kmem_list3
> + */
> +
> list_for_each_entry(cachep, &cache_chain, next) {
> - struct array_cache *nc;
> + /* setup the size64 kmemlist for hcpu before we can
> + * begin anything. Make sure some other cpu on this
> + * node has not already allocated this
> + */
> + if (!cachep->nodelists[node]) {
> + if(!(l3 = kmalloc_node(memsize,
> + GFP_KERNEL, node)))
> + goto bad;
> + LIST3_INIT(l3);
> + l3->next_reap = jiffies + REAPTIMEOUT_LIST3 +
> + ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
>
> - nc = alloc_arraycache(cpu, cachep->limit, cachep->batchcount);
> + cachep->nodelists[node] = l3;
> + }
> +
> + spin_lock_irq(&cachep->nodelists[node]->list_lock);
> + cachep->nodelists[node]->free_limit =
> + (1 + nr_cpus_node(node)) *
> + cachep->batchcount + cachep->num;
> + spin_unlock_irq(&cachep->nodelists[node]->list_lock);
> + }
> +
> + /* Now we can go ahead with allocating the shared array's
> + & array cache's */
> + list_for_each_entry(cachep, &cache_chain, next) {
> + nc = alloc_arraycache(cpu, cachep->limit,
> + cachep->batchcount);
> if (!nc)
> goto bad;
> -
> - spin_lock_irq(&cachep->spinlock);
> cachep->array[cpu] = nc;
> - cachep->free_limit = (1+num_online_cpus())*cachep->batchcount
> - + cachep->num;
> - spin_unlock_irq(&cachep->spinlock);
>
> + l3 = cachep->nodelists[node];
> + BUG_ON(!l3);
> + if(!l3->shared) {
> + if(!(nc = alloc_arraycache(cpu,
> + cachep->shared*cachep->batchcount,
> + 0xbaadf00d)))
> + goto bad;
> +
> + /* we are serialised from CPU_DEAD or
> + CPU_UP_CANCELLED by the cpucontrol lock */
> + l3->shared = nc;
> + }
> }
> up(&cache_chain_sem);
> break;
> @@ -728,13 +910,53 @@ static int __devinit cpuup_callback(stru
>
> list_for_each_entry(cachep, &cache_chain, next) {
> struct array_cache *nc;
> + cpumask_t mask;
>
> + mask = node_to_cpumask(node);
> spin_lock_irq(&cachep->spinlock);
> /* cpu is dead; no one can alloc from it. */
> nc = cachep->array[cpu];
> cachep->array[cpu] = NULL;
> - cachep->free_limit -= cachep->batchcount;
> - free_block(cachep, ac_entry(nc), nc->avail);
> + l3 = cachep->nodelists[node];
> +
> + if(!l3)
> + goto unlock_cache;
> +
> + spin_lock(&l3->list_lock);
> +
> + /* Free limit for this kmem_list3 */
> + l3->free_limit -= cachep->batchcount;
> + if(nc)
> + free_block(cachep, nc->entry, nc->avail);
> +
> + if(!cpus_empty(mask)) {
> + spin_unlock(&l3->list_lock);
> + goto unlock_cache;
> + }
> +
> + if(l3->shared) {
> + free_block(cachep, l3->shared->entry,
> + l3->shared->avail);
> + kfree(l3->shared);
> + l3->shared = NULL;
> + }
> +#ifdef CONFIG_NUMA
> + if(l3->alien) {
> + drain_alien_cache(cachep, l3);
> + free_alien_cache(l3->alien);
> + l3->alien = NULL;
> + }
> +#endif
> +
> + /* free slabs belonging to this node */
> + if(__node_shrink(cachep, node)) {
> + cachep->nodelists[node] = NULL;
> + spin_unlock(&l3->list_lock);
> + kfree(l3);
> + }
> + else
> + spin_unlock(&l3->list_lock);
> +unlock_cache:
> spin_unlock_irq(&cachep->spinlock);
> kfree(nc);
> }
> @@ -750,6 +972,25 @@ bad:
>
> static struct notifier_block cpucache_notifier = { &cpuup_callback, NULL, 0 };
>
> +/*
> + * swap the static kmem_list3 with kmalloced memory
> + */
> +static void init_list(kmem_cache_t *cachep, struct kmem_list3 *list,
> + int nodeid)
> +{
> + struct kmem_list3 *ptr;
> +
> + BUG_ON((cachep->nodelists[nodeid]) != list);
> + ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid);
> + BUG_ON(!ptr);
> +
> + local_irq_disable();
> + memcpy(ptr, list, sizeof(struct kmem_list3));
> + MAKE_ALL_LISTS(cachep, ptr, nodeid);
> + cachep->nodelists[nodeid] = ptr;
> + local_irq_enable();
> +}
> +
> /* Initialisation.
> * Called after the gfp() functions have been enabled, and before smp_init().
> */
> @@ -758,7 +999,15 @@ void __init kmem_cache_init(void)
> size_t left_over;
> struct cache_sizes *sizes;
> struct cache_names *names;
> + int i;
>
> + for(i = 0; i < NUM_INIT_LISTS; i++)
> + LIST3_INIT(&initkmem_list3[i]);
> +
> + for(i = 0; i < MAX_NUMNODES; i++) {
> + LIST3_INIT(&kmem64_list3[i]);
> + cache_cache.nodelists[i] = NULL;
> + }
> /*
> * Fragmentation resistance on low memory - only use bigger
> * page orders on machines with more than 32MB of memory.
> @@ -766,21 +1015,24 @@ void __init kmem_cache_init(void)
> if (num_physpages > (32 << 20) >> PAGE_SHIFT)
> slab_break_gfp_order = BREAK_GFP_ORDER_HI;
>
> -
> /* Bootstrap is tricky, because several objects are allocated
> * from caches that do not exist yet:
> * 1) initialize the cache_cache cache: it contains the kmem_cache_t
> * structures of all caches, except cache_cache itself: cache_cache
> * is statically allocated.
> - * Initially an __init data area is used for the head array, it's
> - * replaced with a kmalloc allocated array at the end of the bootstrap.
> + * Initially an __init data area is used for the head array and the
> + * kmem_list3 structures, it's replaced with a kmalloc allocated
> + * array at the end of the bootstrap.
> * 2) Create the first kmalloc cache.
> - * The kmem_cache_t for the new cache is allocated normally. An __init
> - * data area is used for the head array.
> - * 3) Create the remaining kmalloc caches, with minimally sized head arrays.
> + * The kmem_cache_t for the new cache is allocated normally.
> + * An __init data area is used for the head array.
> + * 3) Create the remaining kmalloc caches, with minimally sized
> + * head arrays.
> * 4) Replace the __init data head arrays for cache_cache and the first
> * kmalloc cache with kmalloc allocated arrays.
> - * 5) Resize the head arrays of the kmalloc caches to their final sizes.
> + * 5) Replace the __init data for kmem_list3 for cache_cache and
> + * the other cache's with kmalloc allocated memory.
> + * 6) Resize the head arrays of the kmalloc caches to their final sizes.
> */
>
> /* 1) create the cache_cache */
> @@ -789,6 +1041,7 @@ void __init kmem_cache_init(void)
> list_add(&cache_cache.next, &cache_chain);
> cache_cache.colour_off = cache_line_size();
> cache_cache.array[smp_processor_id()] = &initarray_cache.cache;
> + cache_cache.nodelists[numa_node_id()] = &initkmem_list3[CACHE_CACHE];
>
> cache_cache.objsize = ALIGN(cache_cache.objsize, cache_line_size());
>
> @@ -833,24 +1086,54 @@ void __init kmem_cache_init(void)
> /* 4) Replace the bootstrap head arrays */
> {
> void * ptr;
> -
> +
> ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
> +
> local_irq_disable();
> BUG_ON(ac_data(&cache_cache) != &initarray_cache.cache);
> - memcpy(ptr, ac_data(&cache_cache), sizeof(struct arraycache_init));
> + memcpy(ptr, ac_data(&cache_cache),
> + sizeof(struct arraycache_init));
> cache_cache.array[smp_processor_id()] = ptr;
> local_irq_enable();
> -
> +
> ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
> +
> local_irq_disable();
> - BUG_ON(ac_data(malloc_sizes[0].cs_cachep) != &initarray_generic.cache);
> + BUG_ON(ac_data(malloc_sizes[0].cs_cachep)
> + != &initarray_generic.cache);
> memcpy(ptr, ac_data(malloc_sizes[0].cs_cachep),
> sizeof(struct arraycache_init));
> malloc_sizes[0].cs_cachep->array[smp_processor_id()] = ptr;
> + }
> + /* 5) Replace the bootstrap kmem_list3's */
> + {
> + int i, j;
> + for (i=0; malloc_sizes[i].cs_size &&
> + (malloc_sizes[i].cs_size < sizeof(struct kmem_list3));
> + i++);
> +
> + BUG_ON(!malloc_sizes[i].cs_size);
> + /* Replace the static kmem_list3 structures for the boot cpu */
> + init_list(&cache_cache, &initkmem_list3[CACHE_CACHE],
> + numa_node_id());
> + if(i) {
> + init_list(malloc_sizes[0].cs_cachep,
> + &initkmem_list3[SIZE_32],
> + numa_node_id());
> + init_list(malloc_sizes[0].cs_dmacachep,
> + &initkmem_list3[SIZE_DMA_32],
> + numa_node_id());
> + }
> +
> + for (j=0; j < MAX_NUMNODES; j++) {
> + if(is_node_online(j))
> + init_list(malloc_sizes[i].cs_cachep,
> + &kmem64_list3[j], j);
> + }
> local_irq_enable();
> }
>
> - /* 5) resize the head arrays to their final sizes */
> + /* 6) resize the head arrays to their final sizes */
> {
> kmem_cache_t *cachep;
> down(&cache_chain_sem);
> @@ -866,7 +1149,6 @@ void __init kmem_cache_init(void)
> * that initializes ac_data for all new cpus
> */
> register_cpu_notifier(&cpucache_notifier);
> -
>
> /* The reap timers are started later, with a module init call:
> * That part of the kernel is not yet operational.
> @@ -1163,6 +1445,21 @@ static void slab_destroy (kmem_cache_t *
> }
> }
>
> +/* For setting up all the kmem_list3s for cache whose objsize is same
> + as size of kmem_list3. */
> +static inline void set_up_list3s(kmem_cache_t *cachep)
> +{
> + int i;
> + for(i = 0; i < MAX_NUMNODES; i++) {
> + if(is_node_online(i)) {
> + cachep->nodelists[i] = &kmem64_list3[i];
> + cachep->nodelists[i]->next_reap = jiffies +
> + REAPTIMEOUT_LIST3 +
> + ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
> + }
> + }
> +}
> +
> /**
> * kmem_cache_create - Create a cache.
> * @name: A string which is used in /proc/slabinfo to identify this cache.
> @@ -1418,10 +1715,6 @@ next:
> cachep->gfpflags |= GFP_DMA;
> spin_lock_init(&cachep->spinlock);
> cachep->objsize = size;
> - /* NUMA */
> - INIT_LIST_HEAD(&cachep->lists.slabs_full);
> - INIT_LIST_HEAD(&cachep->lists.slabs_partial);
> - INIT_LIST_HEAD(&cachep->lists.slabs_free);
>
> if (flags & CFLGS_OFF_SLAB)
> cachep->slabp_cache = kmem_find_general_cachep(slab_size,0);
> @@ -1436,28 +1729,66 @@ next:
> enable_cpucache(cachep);
> } else {
> if (g_cpucache_up == NONE) {
> + int i;
> /* Note: the first kmem_cache_create must create
> * the cache that's used by kmalloc(24), otherwise
> * the creation of further caches will BUG().
> */
> - cachep->array[smp_processor_id()] = &initarray_generic.cache;
> + cachep->array[smp_processor_id()] =
> + &initarray_generic.cache;
> +
> + /* If the cache that's used by
> + * kmalloc(sizeof(kmem_list3)) is the first cache,
> + * then we need to set up all its list3s, otherwise
> + * the creation of further caches will BUG().
> + */
> + for (i=0; malloc_sizes[i].cs_size &&
> + (malloc_sizes[i].cs_size <
> + sizeof(struct kmem_list3)); i++);
> + if(i == 0) {
> + set_up_list3s(cachep);
> + cpucache_up_64 = ALL;
> + }
> + else {
> + cachep->nodelists[numa_node_id()] =
> + &initkmem_list3[SIZE_32];
> + cpucache_up_64 = SIZE_DMA_32;
> + }
> +
> g_cpucache_up = PARTIAL;
> } else {
> - cachep->array[smp_processor_id()] = kmalloc(sizeof(struct arraycache_init),GFP_KERNEL);
> + cachep->array[smp_processor_id()] =
> + kmalloc(sizeof(struct arraycache_init),
> + GFP_KERNEL);
> + if(cpucache_up_64 == SIZE_DMA_32) {
> + cachep->nodelists[numa_node_id()] =
> + &initkmem_list3[SIZE_DMA_32];
> + cpucache_up_64 = SIZE_64;
> + }
> + else if(cpucache_up_64 == SIZE_64) {
> + set_up_list3s(cachep);
> + cpucache_up_64 = ALL;
> + }
> + else {
> + cachep->nodelists[numa_node_id()] =
> + kmalloc(sizeof(struct kmem_list3),
> + GFP_KERNEL);
> + LIST3_INIT(cachep->nodelists[numa_node_id()]);
> + }
> }
> + cachep->nodelists[numa_node_id()]->next_reap =
> + jiffies + REAPTIMEOUT_LIST3 +
> + ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
> +
> BUG_ON(!ac_data(cachep));
> + BUG_ON(!cachep->nodelists[numa_node_id()]);
> ac_data(cachep)->avail = 0;
> ac_data(cachep)->limit = BOOT_CPUCACHE_ENTRIES;
> ac_data(cachep)->batchcount = 1;
> ac_data(cachep)->touched = 0;
> cachep->batchcount = 1;
> cachep->limit = BOOT_CPUCACHE_ENTRIES;
> - cachep->free_limit = (1+num_online_cpus())*cachep->batchcount
> - + cachep->num;
> - }
> -
> - cachep->lists.next_reap = jiffies + REAPTIMEOUT_LIST3 +
> - ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
> + }
>
> /* Need the semaphore to access the chain. */
> down(&cache_chain_sem);
> @@ -1515,13 +1846,23 @@ static void check_spinlock_acquired(kmem
> {
> #ifdef CONFIG_SMP
> check_irq_off();
> - BUG_ON(spin_trylock(&cachep->spinlock));
> + BUG_ON(spin_trylock(&list3_data(cachep)->list_lock));
> #endif
> }
> +
> +static inline void check_spinlock_acquired_node(kmem_cache_t *cachep, int node)
> +{
> +#ifdef CONFIG_SMP
> + check_irq_off();
> + BUG_ON(spin_trylock(&(cachep->nodelists[node])->list_lock));
> +#endif
> +}
> +
> #else
> #define check_irq_off() do { } while(0)
> #define check_irq_on() do { } while(0)
> #define check_spinlock_acquired(x) do { } while(0)
> +#define check_spinlock_acquired_node(x, y) do { } while(0)
> #endif
>
> /*
> @@ -1543,7 +1884,7 @@ static void smp_call_function_all_cpus(v
> }
>
> static void drain_array_locked(kmem_cache_t* cachep,
> - struct array_cache *ac, int force);
> + struct array_cache *ac, int force, int node);
>
> static void do_drain(void *arg)
> {
> @@ -1552,59 +1893,84 @@ static void do_drain(void *arg)
>
> check_irq_off();
> ac = ac_data(cachep);
> - spin_lock(&cachep->spinlock);
> - free_block(cachep, &ac_entry(ac)[0], ac->avail);
> - spin_unlock(&cachep->spinlock);
> + spin_lock(&list3_data(cachep)->list_lock);
> + free_block(cachep, ac->entry, ac->avail);
> + spin_unlock(&list3_data(cachep)->list_lock);
> ac->avail = 0;
> }
>
> static void drain_cpu_caches(kmem_cache_t *cachep)
> {
> + struct kmem_list3 *l3;
> + int i;
> +
> smp_call_function_all_cpus(do_drain, cachep);
> check_irq_on();
> spin_lock_irq(&cachep->spinlock);
> - if (cachep->lists.shared)
> - drain_array_locked(cachep, cachep->lists.shared, 1);
> + for(i = 0; i < MAX_NUMNODES; i++) {
> + l3 = cachep->nodelists[i];
> + if (l3) {
> + spin_lock(&l3->list_lock);
> + drain_array_locked(cachep, l3->shared, 1, i);
> + spin_unlock(&l3->list_lock);
> +#ifdef CONFIG_NUMA
> + if(l3->alien)
> + drain_alien_cache(cachep, l3);
> +#endif
> + }
> + }
> spin_unlock_irq(&cachep->spinlock);
> }
>
> -
> -/* NUMA shrink all list3s */
> -static int __cache_shrink(kmem_cache_t *cachep)
> +static int __node_shrink(kmem_cache_t *cachep, int node)
> {
> struct slab *slabp;
> + struct kmem_list3 *l3 = cachep->nodelists[node];
> int ret;
>
> - drain_cpu_caches(cachep);
> -
> - check_irq_on();
> - spin_lock_irq(&cachep->spinlock);
> -
> for(;;) {
> struct list_head *p;
>
> - p = cachep->lists.slabs_free.prev;
> - if (p == &cachep->lists.slabs_free)
> + p = l3->slabs_free.prev;
> + if (p == &l3->slabs_free)
> break;
>
> - slabp = list_entry(cachep->lists.slabs_free.prev, struct slab, list);
> + slabp = list_entry(l3->slabs_free.prev, struct slab, list);
> #if DEBUG
> if (slabp->inuse)
> BUG();
> #endif
> list_del(&slabp->list);
>
> - cachep->lists.free_objects -= cachep->num;
> - spin_unlock_irq(&cachep->spinlock);
> + l3->free_objects -= cachep->num;
> + spin_unlock_irq(&l3->list_lock);
> slab_destroy(cachep, slabp);
> - spin_lock_irq(&cachep->spinlock);
> + spin_lock_irq(&l3->list_lock);
> }
> - ret = !list_empty(&cachep->lists.slabs_full) ||
> - !list_empty(&cachep->lists.slabs_partial);
> - spin_unlock_irq(&cachep->spinlock);
> + ret = !list_empty(&l3->slabs_full) ||
> + !list_empty(&l3->slabs_partial);
> return ret;
> }
>
> +static int __cache_shrink(kmem_cache_t *cachep)
> +{
> + int ret = 0, i = 0;
> + struct kmem_list3 *l3;
> +
> + drain_cpu_caches(cachep);
> +
> + check_irq_on();
> + for (i = 0; i < MAX_NUMNODES; i++) {
> + l3 = cachep->nodelists[i];
> + if(l3) {
> + spin_lock_irq(&l3->list_lock);
> + ret += __node_shrink(cachep, i);
> + spin_unlock_irq(&l3->list_lock);
> + }
> + }
> + return (ret ? 1 : 0);
> +}
> +
> /**
> * kmem_cache_shrink - Shrink a cache.
> * @cachep: The cache to shrink.
> @@ -1641,6 +2007,7 @@ EXPORT_SYMBOL(kmem_cache_shrink);
> int kmem_cache_destroy(kmem_cache_t * cachep)
> {
> int i;
> + struct kmem_list3 *l3;
>
> if (!cachep || in_interrupt())
> BUG();
> @@ -1675,8 +2042,15 @@ int kmem_cache_destroy(kmem_cache_t * ca
> kfree(cachep->array[i]);
>
> /* NUMA: free the list3 structures */
> - kfree(cachep->lists.shared);
> - cachep->lists.shared = NULL;
> + for(i = 0; i < MAX_NUMNODES; i++) {
> + if((l3 = cachep->nodelists[i])) {
> + kfree(l3->shared);
> +#ifdef CONFIG_NUMA
> + free_alien_cache(l3->alien);
> +#endif
> + kfree(l3);
> + }
> + }
> kmem_cache_free(&cache_cache, cachep);
>
> unlock_cpu_hotplug();
> @@ -1795,6 +2169,7 @@ static int cache_grow(kmem_cache_t *cach
> size_t offset;
> unsigned int local_flags;
> unsigned long ctor_flags;
> + struct kmem_list3 *l3;
>
> /* Be lazy and only check for valid flags here,
> * keeping it out of the critical path in kmem_cache_alloc().
> @@ -1826,6 +2201,7 @@ static int cache_grow(kmem_cache_t *cach
>
> spin_unlock(&cachep->spinlock);
>
> + check_irq_off();
> if (local_flags & __GFP_WAIT)
> local_irq_enable();
>
> @@ -1837,8 +2213,9 @@ static int cache_grow(kmem_cache_t *cach
> */
> kmem_flagcheck(cachep, flags);
>
> -
> - /* Get mem for the objs. */
> + /* Get mem for the objs.
> + * Attempt to allocate a physical page from 'nodeid',
> + */
> if (!(objp = kmem_getpages(cachep, flags, nodeid)))
> goto failed;
>
> @@ -1846,6 +2223,9 @@ static int cache_grow(kmem_cache_t *cach
> if (!(slabp = alloc_slabmgmt(cachep, objp, offset, local_flags)))
> goto opps1;
>
> +#ifdef CONFIG_NUMA
> + slabp->nodeid = nodeid;
> +#endif
> set_slab_attr(cachep, slabp, objp);
>
> cache_init_objs(cachep, slabp, ctor_flags);
> @@ -1853,13 +2233,14 @@ static int cache_grow(kmem_cache_t *cach
> if (local_flags & __GFP_WAIT)
> local_irq_disable();
> check_irq_off();
> - spin_lock(&cachep->spinlock);
> + l3 = cachep->nodelists[nodeid];
> + spin_lock(&l3->list_lock);
>
> /* Make slab active. */
> - list_add_tail(&slabp->list, &(list3_data(cachep)->slabs_free));
> + list_add_tail(&slabp->list, &(l3->slabs_free));
> STATS_INC_GROWN(cachep);
> - list3_data(cachep)->free_objects += cachep->num;
> - spin_unlock(&cachep->spinlock);
> + l3->free_objects += cachep->num;
> + spin_unlock(&l3->list_lock);
> return 1;
> opps1:
> kmem_freepages(cachep, objp);
> @@ -1965,7 +2346,6 @@ static void check_slabp(kmem_cache_t *ca
> kmem_bufctl_t i;
> int entries = 0;
>
> - check_spinlock_acquired(cachep);
> /* Check slab's freelist to see if this obj is there. */
> for (i = slabp->free; i != BUFCTL_END; i = slab_bufctl(slabp)[i]) {
> entries++;
> @@ -2010,8 +2390,9 @@ retry:
> }
> l3 = list3_data(cachep);
>
> - BUG_ON(ac->avail > 0);
> - spin_lock(&cachep->spinlock);
> + BUG_ON(ac->avail > 0 || !l3);
> + spin_lock(&l3->list_lock);
> +
> if (l3->shared) {
> struct array_cache *shared_array = l3->shared;
> if (shared_array->avail) {
> @@ -2019,8 +2400,9 @@ retry:
> batchcount = shared_array->avail;
> shared_array->avail -= batchcount;
> ac->avail = batchcount;
> - memcpy(ac_entry(ac), &ac_entry(shared_array)[shared_array->avail],
> - sizeof(void*)*batchcount);
> + memcpy(ac->entry,
> + &(shared_array->entry[shared_array->avail]),
> + sizeof(void*)*batchcount);
> shared_array->touched = 1;
> goto alloc_done;
> }
> @@ -2047,7 +2429,8 @@ retry:
> STATS_SET_HIGH(cachep);
>
> /* get obj pointer */
> - ac_entry(ac)[ac->avail++] = slabp->s_mem + slabp->free*cachep->objsize;
> + ac->entry[ac->avail++] = slabp->s_mem +
> + slabp->free*cachep->objsize;
>
> slabp->inuse++;
> next = slab_bufctl(slabp)[slabp->free];
> @@ -2069,12 +2452,12 @@ retry:
> must_grow:
> l3->free_objects -= ac->avail;
> alloc_done:
> - spin_unlock(&cachep->spinlock);
> + spin_unlock(&l3->list_lock);
>
> if (unlikely(!ac->avail)) {
> int x;
> - x = cache_grow(cachep, flags, -1);
> -
> + x = cache_grow(cachep, flags, numa_node_id());
> +
> // cache_grow can reenable interrupts, then ac could change.
> ac = ac_data(cachep);
> if (!x && ac->avail == 0) // no objects in sight? abort
> @@ -2084,7 +2467,7 @@ alloc_done:
> goto retry;
> }
> ac->touched = 1;
> - return ac_entry(ac)[--ac->avail];
> + return ac->entry[--ac->avail];
> }
>
> static inline void
> @@ -2156,7 +2539,7 @@ static inline void *__cache_alloc(kmem_c
> if (likely(ac->avail)) {
> STATS_INC_ALLOCHIT(cachep);
> ac->touched = 1;
> - objp = ac_entry(ac)[--ac->avail];
> + objp = ac->entry[--ac->avail];
> } else {
> STATS_INC_ALLOCMISS(cachep);
> objp = cache_alloc_refill(cachep, flags);
> @@ -2166,29 +2549,102 @@ static inline void *__cache_alloc(kmem_c
> return objp;
> }
>
> -/*
> - * NUMA: different approach needed if the spinlock is moved into
> - * the l3 structure
> +#ifdef CONFIG_NUMA
> +/*
> + * A interface to enable slab creation on nodeid
> */
> +static void *__cache_alloc_node(kmem_cache_t *cachep, int flags, int nodeid)
> +{
> + struct list_head *entry;
> + struct slab *slabp;
> + struct kmem_list3 *l3;
> + void *obj;
> + kmem_bufctl_t next;
> + int x;
> +
> + l3 = cachep->nodelists[nodeid];
> + BUG_ON(!l3);
> +
> +retry:
> + spin_lock(&l3->list_lock);
> + entry = l3->slabs_partial.next;
> + if (entry == &l3->slabs_partial) {
> + l3->free_touched = 1;
> + entry = l3->slabs_free.next;
> + if (entry == &l3->slabs_free)
> + goto must_grow;
> + }
> +
> + slabp = list_entry(entry, struct slab, list);
> + check_spinlock_acquired_node(cachep, nodeid);
> + check_slabp(cachep, slabp);
> +
> + STATS_INC_NODEALLOCS(cachep);
> + STATS_INC_ACTIVE(cachep);
> + STATS_SET_HIGH(cachep);
>
> + BUG_ON(slabp->inuse == cachep->num);
> +
> + /* get obj pointer */
> + obj = slabp->s_mem + slabp->free*cachep->objsize;
> + slabp->inuse++;
> + next = slab_bufctl(slabp)[slabp->free];
> +#if DEBUG
> + slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE;
> +#endif
> + slabp->free = next;
> + check_slabp(cachep, slabp);
> + l3->free_objects--;
> + /* move slabp to correct slabp list: */
> + list_del(&slabp->list);
> +
> + if (slabp->free == BUFCTL_END) {
> + list_add(&slabp->list, &l3->slabs_full);
> + }
> + else {
> + list_add(&slabp->list, &l3->slabs_partial);
> + }
> +
> + spin_unlock(&l3->list_lock);
> + goto done;
> +
> +must_grow:
> + spin_unlock(&l3->list_lock);
> + x = cache_grow(cachep, flags, nodeid);
> +
> + if (!x)
> + return NULL;
> +
> + goto retry;
> +done:
> + return obj;
> +}
> +#endif
> +
> +/*
> + * Caller needs to acquire correct kmem_list's list_lock
> + */
> static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects)
> {
> int i;
> -
> - check_spinlock_acquired(cachep);
> -
> - /* NUMA: move add into loop */
> - cachep->lists.free_objects += nr_objects;
> + struct kmem_list3 *l3;
>
> for (i = 0; i < nr_objects; i++) {
> void *objp = objpp[i];
> struct slab *slabp;
> unsigned int objnr;
> + int nodeid = 0;
>
> slabp = GET_PAGE_SLAB(virt_to_page(objp));
> +#ifdef CONFIG_NUMA
> + nodeid = slabp->nodeid;
> +#endif
> + l3 = cachep->nodelists[nodeid];
> list_del(&slabp->list);
> objnr = (objp - slabp->s_mem) / cachep->objsize;
> + check_spinlock_acquired_node(cachep, nodeid);
> check_slabp(cachep, slabp);
> +
> #if DEBUG
> if (slab_bufctl(slabp)[objnr] != BUFCTL_FREE) {
> printk(KERN_ERR "slab: double free detected in cache '%s', objp %p.\n",
> @@ -2200,24 +2656,23 @@ static void free_block(kmem_cache_t *cac
> slabp->free = objnr;
> STATS_DEC_ACTIVE(cachep);
> slabp->inuse--;
> + l3->free_objects++;
> check_slabp(cachep, slabp);
>
> /* fixup slab chains */
> if (slabp->inuse == 0) {
> - if (cachep->lists.free_objects > cachep->free_limit) {
> - cachep->lists.free_objects -= cachep->num;
> + if (l3->free_objects > l3->free_limit) {
> + l3->free_objects -= cachep->num;
> slab_destroy(cachep, slabp);
> } else {
> - list_add(&slabp->list,
> - &list3_data_ptr(cachep, objp)->slabs_free);
> + list_add(&slabp->list, &l3->slabs_free);
> }
> } else {
> /* Unconditionally move a slab to the end of the
> * partial list on free - maximum time for the
> * other objects to be freed, too.
> */
> - list_add_tail(&slabp->list,
> - &list3_data_ptr(cachep, objp)->slabs_partial);
> + list_add_tail(&slabp->list, &l3->slabs_partial);
> }
> }
> }
> @@ -2225,36 +2680,38 @@ static void free_block(kmem_cache_t *cac
> static void cache_flusharray(kmem_cache_t *cachep, struct array_cache *ac)
> {
> int batchcount;
> + struct kmem_list3 *l3;
>
> batchcount = ac->batchcount;
> #if DEBUG
> BUG_ON(!batchcount || batchcount > ac->avail);
> #endif
> check_irq_off();
> - spin_lock(&cachep->spinlock);
> - if (cachep->lists.shared) {
> - struct array_cache *shared_array = cachep->lists.shared;
> + l3 = list3_data(cachep);
> + spin_lock(&l3->list_lock);
> + if (l3->shared) {
> + struct array_cache *shared_array = l3->shared;
> int max = shared_array->limit-shared_array->avail;
> if (max) {
> if (batchcount > max)
> batchcount = max;
> - memcpy(&ac_entry(shared_array)[shared_array->avail],
> - &ac_entry(ac)[0],
> + memcpy(&(shared_array->entry[shared_array->avail]),
> + ac->entry,
> sizeof(void*)*batchcount);
> shared_array->avail += batchcount;
> goto free_done;
> }
> }
>
> - free_block(cachep, &ac_entry(ac)[0], batchcount);
> + free_block(cachep, ac->entry, batchcount);
> free_done:
> #if STATS
> {
> int i = 0;
> struct list_head *p;
>
> - p = list3_data(cachep)->slabs_free.next;
> - while (p != &(list3_data(cachep)->slabs_free)) {
> + p = l3->slabs_free.next;
> + while (p != &(l3->slabs_free)) {
> struct slab *slabp;
>
> slabp = list_entry(p, struct slab, list);
> @@ -2266,12 +2723,13 @@ free_done:
> STATS_SET_FREEABLE(cachep, i);
> }
> #endif
> - spin_unlock(&cachep->spinlock);
> + spin_unlock(&l3->list_lock);
> ac->avail -= batchcount;
> - memmove(&ac_entry(ac)[0], &ac_entry(ac)[batchcount],
> + memmove(ac->entry, &(ac->entry[batchcount]),
> sizeof(void*)*ac->avail);
> }
>
> +
> /*
> * __cache_free
> * Release an obj back to its cache. If the obj has a constructed
> @@ -2286,14 +2744,47 @@ static inline void __cache_free(kmem_cac
> check_irq_off();
> objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
>
> + /* Make sure we are not freeing a object from another
> + * node to the array cache on this cpu.
> + */
> +#ifdef CONFIG_NUMA
> + {
> + struct slab *slabp;
> + slabp = GET_PAGE_SLAB(virt_to_page(objp));
> + if(unlikely(slabp->nodeid != numa_node_id())) {
> + struct array_cache *alien = NULL;
> + int nodeid = slabp->nodeid;
> + struct kmem_list3 *l3 = list3_data(cachep);
> +
> + STATS_INC_NODEFREES(cachep);
> + if(l3->alien && l3->alien[nodeid]) {
> + alien = l3->alien[nodeid];
> + spin_lock(&alien->lock);
> + if(unlikely(alien->avail == alien->limit))
> + __drain_alien_cache(cachep,
> + alien, nodeid);
> + alien->entry[alien->avail++] = objp;
> + spin_unlock(&alien->lock);
> + }
> + else {
> + spin_lock(&(cachep->nodelists[nodeid])->
> + list_lock);
> + free_block(cachep, &objp, 1);
> + spin_unlock(&(cachep->nodelists[nodeid])->
> + list_lock);
> + }
> + return;
> + }
> + }
> +#endif
> if (likely(ac->avail < ac->limit)) {
> STATS_INC_FREEHIT(cachep);
> - ac_entry(ac)[ac->avail++] = objp;
> + ac->entry[ac->avail++] = objp;
> return;
> } else {
> STATS_INC_FREEMISS(cachep);
> cache_flusharray(cachep, ac);
> - ac_entry(ac)[ac->avail++] = objp;
> + ac->entry[ac->avail++] = objp;
> }
> }
>
> @@ -2363,78 +2854,24 @@ out:
> * Identical to kmem_cache_alloc, except that this function is slow
> * and can sleep. And it will allocate memory on the given node, which
> * can improve the performance for cpu bound structures.
> + * New and improved: it will now make sure that the object gets
> + * put on the correct node list so that there is no false sharing.
> */
> void *kmem_cache_alloc_node(kmem_cache_t *cachep, int flags, int nodeid)
> {
> - int loop;
> - void *objp;
> - struct slab *slabp;
> - kmem_bufctl_t next;
> -
> - for (loop = 0;;loop++) {
> - struct list_head *q;
> -
> - objp = NULL;
> - check_irq_on();
> - spin_lock_irq(&cachep->spinlock);
> - /* walk through all partial and empty slab and find one
> - * from the right node */
> - list_for_each(q,&cachep->lists.slabs_partial) {
> - slabp = list_entry(q, struct slab, list);
> -
> - if (page_to_nid(virt_to_page(slabp->s_mem)) == nodeid ||
> - loop > 2)
> - goto got_slabp;
> - }
> - list_for_each(q, &cachep->lists.slabs_free) {
> - slabp = list_entry(q, struct slab, list);
> -
> - if (page_to_nid(virt_to_page(slabp->s_mem)) == nodeid ||
> - loop > 2)
> - goto got_slabp;
> - }
> - spin_unlock_irq(&cachep->spinlock);
> -
> - local_irq_disable();
> - if (!cache_grow(cachep, flags, nodeid)) {
> - local_irq_enable();
> - return NULL;
> - }
> - local_irq_enable();
> - }
> -got_slabp:
> - /* found one: allocate object */
> - check_slabp(cachep, slabp);
> - check_spinlock_acquired(cachep);
> -
> - STATS_INC_ALLOCED(cachep);
> - STATS_INC_ACTIVE(cachep);
> - STATS_SET_HIGH(cachep);
> - STATS_INC_NODEALLOCS(cachep);
> -
> - objp = slabp->s_mem + slabp->free*cachep->objsize;
> -
> - slabp->inuse++;
> - next = slab_bufctl(slabp)[slabp->free];
> -#if DEBUG
> - slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE;
> -#endif
> - slabp->free = next;
> - check_slabp(cachep, slabp);
> + unsigned long save_flags;
> + void *ptr;
>
> - /* move slabp to correct slabp list: */
> - list_del(&slabp->list);
> - if (slabp->free == BUFCTL_END)
> - list_add(&slabp->list, &cachep->lists.slabs_full);
> - else
> - list_add(&slabp->list, &cachep->lists.slabs_partial);
> + if(nodeid == numa_node_id() || nodeid == -1)
> + return __cache_alloc(cachep, flags);
>
> - list3_data(cachep)->free_objects--;
> - spin_unlock_irq(&cachep->spinlock);
> + cache_alloc_debugcheck_before(cachep, flags);
> + local_irq_save(save_flags);
> + ptr = __cache_alloc_node(cachep, flags, nodeid);
> + local_irq_restore(save_flags);
> + ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, __builtin_return_address(0));
>
> - objp = cache_alloc_debugcheck_after(cachep, GFP_KERNEL, objp,
> - __builtin_return_address(0));
> - return objp;
> + return ptr;
> }
> EXPORT_SYMBOL(kmem_cache_alloc_node);
>
> @@ -2620,6 +3057,81 @@ unsigned int kmem_cache_size(kmem_cache_
> }
> EXPORT_SYMBOL(kmem_cache_size);
>
> +/*
> + * This initializes kmem_list3 for all nodes.
> + */
> +static int alloc_kmemlist(kmem_cache_t *cachep)
> +{
> + int node, i;
> + struct kmem_list3 *l3;
> + int err = 0;
> +
> + for(i=0; i < NR_CPUS; i++) {
> + if(cpu_online(i)) {
> + struct array_cache *nc = NULL, *new;
> +#ifdef CONFIG_NUMA
> + struct array_cache **new_alien = NULL;
> +#endif
> + node = cpu_to_node(i);
> +#ifdef CONFIG_NUMA
> + if(!(new_alien = alloc_alien_cache(i, cachep->limit)))
> + goto fail;
> +#endif
> + if(!(new = alloc_arraycache(i, (cachep->shared*
> + cachep->batchcount), 0xbaadf00d)))
> + goto fail;
> + if((l3 = cachep->nodelists[node])) {
> +
> + spin_lock_irq(&l3->list_lock);
> +
> + if((nc = cachep->nodelists[node]->shared))
> + free_block(cachep, nc->entry,
> + nc->avail);
> +
> + l3->shared = new;
> +#ifdef CONFIG_NUMA
> + if(!cachep->nodelists[node]->alien) {
> + l3->alien = new_alien;
> + new_alien = NULL;
> + }
> + l3->free_limit = (1 + nr_cpus_node(node))*
> + cachep->batchcount + cachep->num;
> +#else
> + l3->free_limit = (1 + num_online_cpus())*
> + cachep->batchcount + cachep->num;
> +#endif
> + spin_unlock_irq(&l3->list_lock);
> + kfree(nc);
> +#ifdef CONFIG_NUMA
> + free_alien_cache(new_alien);
> +#endif
> + continue;
> + }
> + if(!(l3 = kmalloc_node(sizeof(struct kmem_list3),
> + GFP_KERNEL, node)))
> + goto fail;
> +
> + LIST3_INIT(l3);
> + l3->next_reap = jiffies + REAPTIMEOUT_LIST3 +
> + ((unsigned long)cachep)%REAPTIMEOUT_LIST3;
> + l3->shared = new;
> +#ifdef CONFIG_NUMA
> + l3->alien = new_alien;
> + l3->free_limit = (1 + nr_cpus_node(node))*
> + cachep->batchcount + cachep->num;
> +#else
> + l3->free_limit = (1 + num_online_cpus())*
> + cachep->batchcount + cachep->num;
> +#endif
> + cachep->nodelists[node] = l3;
> + }
> + }
> + return err;
> +fail:
> + err = -ENOMEM;
> + return err;
> +}
> +
> struct ccupdate_struct {
> kmem_cache_t *cachep;
> struct array_cache *new[NR_CPUS];
> @@ -2642,8 +3154,7 @@ static int do_tune_cpucache(kmem_cache_t
> int shared)
> {
> struct ccupdate_struct new;
> - struct array_cache *new_shared;
> - int i;
> + int i, err;
>
> memset(&new.new,0,sizeof(new.new));
> for (i = 0; i < NR_CPUS; i++) {
> @@ -2660,36 +3171,30 @@ static int do_tune_cpucache(kmem_cache_t
> new.cachep = cachep;
>
> smp_call_function_all_cpus(do_ccupdate_local, (void *)&new);
> -
> +
> check_irq_on();
> spin_lock_irq(&cachep->spinlock);
> cachep->batchcount = batchcount;
> cachep->limit = limit;
> - cachep->free_limit = (1+num_online_cpus())*cachep->batchcount + cachep->num;
> + cachep->shared = shared;
> spin_unlock_irq(&cachep->spinlock);
>
> for (i = 0; i < NR_CPUS; i++) {
> struct array_cache *ccold = new.new[i];
> if (!ccold)
> continue;
> - spin_lock_irq(&cachep->spinlock);
> - free_block(cachep, ac_entry(ccold), ccold->avail);
> - spin_unlock_irq(&cachep->spinlock);
> + spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock);
> + free_block(cachep, ccold->entry, ccold->avail);
> + spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock);
> kfree(ccold);
> }
> - new_shared = alloc_arraycache(-1, batchcount*shared, 0xbaadf00d);
> - if (new_shared) {
> - struct array_cache *old;
> -
> - spin_lock_irq(&cachep->spinlock);
> - old = cachep->lists.shared;
> - cachep->lists.shared = new_shared;
> - if (old)
> - free_block(cachep, ac_entry(old), old->avail);
> - spin_unlock_irq(&cachep->spinlock);
> - kfree(old);
> - }
>
> + err = alloc_kmemlist(cachep);
> + if (err) {
> + printk(KERN_ERR "alloc_kmemlist failed for %s, error %d.\n",
> + cachep->name, -err);
> + BUG();
> + }
> return 0;
> }
>
> @@ -2747,11 +3252,11 @@ static void enable_cpucache(kmem_cache_t
> }
>
> static void drain_array_locked(kmem_cache_t *cachep,
> - struct array_cache *ac, int force)
> + struct array_cache *ac, int force, int node)
> {
> int tofree;
>
> - check_spinlock_acquired(cachep);
> + check_spinlock_acquired_node(cachep, node);
> if (ac->touched && !force) {
> ac->touched = 0;
> } else if (ac->avail) {
> @@ -2759,9 +3264,9 @@ static void drain_array_locked(kmem_cach
> if (tofree > ac->avail) {
> tofree = (ac->avail+1)/2;
> }
> - free_block(cachep, ac_entry(ac), tofree);
> + free_block(cachep, ac->entry, tofree);
> ac->avail -= tofree;
> - memmove(&ac_entry(ac)[0], &ac_entry(ac)[tofree],
> + memmove(ac->entry, &(ac->entry[tofree]),
> sizeof(void*)*ac->avail);
> }
> }
> @@ -2780,6 +3285,7 @@ static void drain_array_locked(kmem_cach
> static void cache_reap(void *unused)
> {
> struct list_head *walk;
> + struct kmem_list3 *l3;
>
> if (down_trylock(&cache_chain_sem)) {
> /* Give up. Setup the next iteration. */
> @@ -2800,27 +3306,35 @@ static void cache_reap(void *unused)
>
> check_irq_on();
>
> - spin_lock_irq(&searchp->spinlock);
> + l3 = list3_data(searchp);
> +#ifdef CONFIG_NUMA
> + if(l3->alien)
> + drain_alien_cache(searchp, l3);
> +#endif
> +
> + spin_lock_irq(&l3->list_lock);
>
> - drain_array_locked(searchp, ac_data(searchp), 0);
> + drain_array_locked(searchp, ac_data(searchp), 0,
> + numa_node_id());
>
> - if(time_after(searchp->lists.next_reap, jiffies))
> + if(time_after(l3->next_reap, jiffies))
> goto next_unlock;
>
> - searchp->lists.next_reap = jiffies + REAPTIMEOUT_LIST3;
> + l3->next_reap = jiffies + REAPTIMEOUT_LIST3;
>
> - if (searchp->lists.shared)
> - drain_array_locked(searchp, searchp->lists.shared, 0);
> + if (l3->shared)
> + drain_array_locked(searchp, l3->shared, 0,
> + numa_node_id());
>
> - if (searchp->lists.free_touched) {
> - searchp->lists.free_touched = 0;
> + if (l3->free_touched) {
> + l3->free_touched = 0;
> goto next_unlock;
> }
>
> - tofree = (searchp->free_limit+5*searchp->num-1)/(5*searchp->num);
> + tofree = (l3->free_limit+5*searchp->num-1)/(5*searchp->num);
> do {
> - p = list3_data(searchp)->slabs_free.next;
> - if (p == &(list3_data(searchp)->slabs_free))
> + p = l3->slabs_free.next;
> + if (p == &(l3->slabs_free))
> break;
>
> slabp = list_entry(p, struct slab, list);
> @@ -2833,13 +3347,13 @@ static void cache_reap(void *unused)
> * searchp cannot disappear, we hold
> * cache_chain_lock
> */
> - searchp->lists.free_objects -= searchp->num;
> - spin_unlock_irq(&searchp->spinlock);
> + l3->free_objects -= searchp->num;
> + spin_unlock_irq(&l3->list_lock);
> slab_destroy(searchp, slabp);
> - spin_lock_irq(&searchp->spinlock);
> + spin_lock_irq(&l3->list_lock);
> } while(--tofree > 0);
> next_unlock:
> - spin_unlock_irq(&searchp->spinlock);
> + spin_unlock_irq(&l3->list_lock);
> next:
> cond_resched();
> }
> @@ -2872,7 +3386,7 @@ static void *s_start(struct seq_file *m,
> seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
> #if STATS
> seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped>"
> - " <error> <maxfreeable> <freelimit> <nodeallocs>");
> + " <error> <maxfreeable> <nodeallocs> <remotefrees>");
> seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>");
> #endif
> seq_putc(m, '\n');
> @@ -2907,39 +3421,53 @@ static int s_show(struct seq_file *m, vo
> unsigned long active_objs;
> unsigned long num_objs;
> unsigned long active_slabs = 0;
> - unsigned long num_slabs;
> - const char *name;
> + unsigned long num_slabs, free_objects = 0, shared_avail = 0;
> + const char *name;
> char *error = NULL;
> + int i;
> + struct kmem_list3 *l3;
>
> check_irq_on();
> spin_lock_irq(&cachep->spinlock);
> active_objs = 0;
> num_slabs = 0;
> - list_for_each(q,&cachep->lists.slabs_full) {
> - slabp = list_entry(q, struct slab, list);
> - if (slabp->inuse != cachep->num && !error)
> - error = "slabs_full accounting error";
> - active_objs += cachep->num;
> - active_slabs++;
> - }
> - list_for_each(q,&cachep->lists.slabs_partial) {
> - slabp = list_entry(q, struct slab, list);
> - if (slabp->inuse == cachep->num && !error)
> - error = "slabs_partial inuse accounting error";
> - if (!slabp->inuse && !error)
> - error = "slabs_partial/inuse accounting error";
> - active_objs += slabp->inuse;
> - active_slabs++;
> - }
> - list_for_each(q,&cachep->lists.slabs_free) {
> - slabp = list_entry(q, struct slab, list);
> - if (slabp->inuse && !error)
> - error = "slabs_free/inuse accounting error";
> - num_slabs++;
> + for( i=0; i<MAX_NUMNODES; i++) {
> + l3 = cachep->nodelists[i];
> + if(!l3 || !is_node_online(i))
> + continue;
> +
> + spin_lock(&l3->list_lock);
> +
> + list_for_each(q,&l3->slabs_full) {
> + slabp = list_entry(q, struct slab, list);
> + if (slabp->inuse != cachep->num && !error)
> + error = "slabs_full accounting error";
> + active_objs += cachep->num;
> + active_slabs++;
> + }
> + list_for_each(q,&l3->slabs_partial) {
> + slabp = list_entry(q, struct slab, list);
> + if (slabp->inuse == cachep->num && !error)
> + error = "slabs_partial inuse accounting error";
> + if (!slabp->inuse && !error)
> + error = "slabs_partial/inuse accounting error";
> + active_objs += slabp->inuse;
> + active_slabs++;
> + }
> + list_for_each(q,&l3->slabs_free) {
> + slabp = list_entry(q, struct slab, list);
> + if (slabp->inuse && !error)
> + error = "slabs_free/inuse accounting error";
> + num_slabs++;
> + }
> + free_objects += l3->free_objects;
> + shared_avail += l3->shared->avail;
> +
> + spin_unlock(&l3->list_lock);
> }
> num_slabs+=active_slabs;
> num_objs = num_slabs*cachep->num;
> - if (num_objs - active_objs != cachep->lists.free_objects && !error)
> + if (num_objs - active_objs != free_objects && !error)
> error = "free_objects accounting error";
>
> name = cachep->name;
> @@ -2951,9 +3479,9 @@ static int s_show(struct seq_file *m, vo
> cachep->num, (1<<cachep->gfporder));
> seq_printf(m, " : tunables %4u %4u %4u",
> cachep->limit, cachep->batchcount,
> - cachep->lists.shared->limit/cachep->batchcount);
> - seq_printf(m, " : slabdata %6lu %6lu %6u",
> - active_slabs, num_slabs, cachep->lists.shared->avail);
> + cachep->shared);
> + seq_printf(m, " : slabdata %6lu %6lu %6lu",
> + active_slabs, num_slabs, shared_avail);
> #if STATS
> { /* list3 stats */
> unsigned long high = cachep->high_mark;
> @@ -2962,12 +3490,13 @@ static int s_show(struct seq_file *m, vo
> unsigned long reaped = cachep->reaped;
> unsigned long errors = cachep->errors;
> unsigned long max_freeable = cachep->max_freeable;
> - unsigned long free_limit = cachep->free_limit;
> unsigned long node_allocs = cachep->node_allocs;
> + unsigned long node_frees = cachep->node_frees;
>
> - seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu %4lu %4lu %4lu %4lu",
> - allocs, high, grown, reaped, errors,
> - max_freeable, free_limit, node_allocs);
> + seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \
> + %4lu %4lu %4lu %4lu",
> + allocs, high, grown, reaped, errors,
> + max_freeable, node_allocs, node_frees);
> }
> /* cpu stats */
> {
> @@ -3048,7 +3577,8 @@ ssize_t slabinfo_write(struct file *file
> shared < 0) {
> res = -EINVAL;
> } else {
> - res = do_tune_cpucache(cachep, limit, batchcount, shared);
> + res = do_tune_cpucache(cachep, limit,
> + batchcount, shared);
> }
> break;
> }
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"aart@kvack.org"> aart@kvack.org </a>

--
Thanks

Jack Steiner (steiner@sgi.com) 651-683-5302
Principal Engineer SGI - Silicon Graphics, Inc.


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