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mempool: cache optimisations

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Signed-off-by: Intel
This commit is contained in:
Intel 2012-12-20 00:00:00 +01:00 committed by Thomas Monjalon
parent 50d7690548
commit ea5dd2744b
2 changed files with 61 additions and 137 deletions
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6
lib/librte_mempool/rte_mempool.c
View File

@ -61,6 +61,7 @@
TAILQ_HEAD(rte_mempool_list, rte_mempool);
#define CACHE_FLUSHTHRESH_MULTIPLIER 1.5
/*
* return the greatest common divisor between a and b (fast algorithm)
@ -252,11 +253,11 @@ rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
mp->ring = r;
mp->size = n;
mp->flags = flags;
mp->bulk_default = 1;
mp->elt_size = elt_size;
mp->header_size = header_size;
mp->trailer_size = trailer_size;
mp->cache_size = cache_size;
mp->cache_flushthresh = (uint32_t)(cache_size * CACHE_FLUSHTHRESH_MULTIPLIER);
mp->private_data_size = private_data_size;
/* call the initializer */
@ -379,7 +380,7 @@ mempool_audit_cache(const struct rte_mempool *mp)
/* check cache size consistency */
unsigned lcore_id;
for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
if (mp->local_cache[lcore_id].len > mp->cache_size) {
if (mp->local_cache[lcore_id].len > mp->cache_flushthresh) {
RTE_LOG(CRIT, MEMPOOL, "badness on cache[%u]\n",
lcore_id);
rte_panic("MEMPOOL: invalid cache len\n");
@ -414,7 +415,6 @@ rte_mempool_dump(const struct rte_mempool *mp)
printf(" flags=%x\n", mp->flags);
printf(" ring=<%s>@%p\n", mp->ring->name, mp->ring);
printf(" size=%"PRIu32"\n", mp->size);
printf(" bulk_default=%"PRIu32"\n", mp->bulk_default);
printf(" header_size=%"PRIu32"\n", mp->header_size);
printf(" elt_size=%"PRIu32"\n", mp->elt_size);
printf(" trailer_size=%"PRIu32"\n", mp->trailer_size);

192
lib/librte_mempool/rte_mempool.h
View File

@ -68,8 +68,8 @@
#include <rte_log.h>
#include <rte_debug.h>
#include <rte_memory.h>
#include <rte_lcore.h>
#include <rte_memory.h>
#include <rte_branch_prediction.h>
#include <rte_ring.h>
@ -101,7 +101,11 @@ struct rte_mempool_debug_stats {
*/
struct rte_mempool_cache {
unsigned len; /**< Cache len */
void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE]; /**< Cache objects */
/*
* Cache is allocated to this size to allow it to overflow in certain
* cases to avoid needless emptying of cache.
*/
void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
} __rte_cache_aligned;
#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
@ -118,8 +122,8 @@ struct rte_mempool {
phys_addr_t phys_addr; /**< Phys. addr. of mempool struct. */
int flags; /**< Flags of the mempool. */
uint32_t size; /**< Size of the mempool. */
uint32_t bulk_default; /**< Default bulk count. */
uint32_t cache_size; /**< Size of per-lcore local cache. */
uint32_t cache_flushthresh; /**< Threshold before we flush excess elements. */
uint32_t elt_size; /**< Size of an element. */
uint32_t header_size; /**< Size of header (before elt). */
@ -144,7 +148,7 @@ struct rte_mempool {
#define MEMPOOL_F_SC_GET 0x0008 /**< Default get is "single-consumer".*/
/**
* When debug is enabled, store some statistics.
* @internal When debug is enabled, store some statistics.
* @param mp
* Pointer to the memory pool.
* @param name
@ -163,7 +167,7 @@ struct rte_mempool {
#endif
/**
* Get a pointer to a mempool pointer in the object header.
* @internal Get a pointer to a mempool pointer in the object header.
* @param obj
* Pointer to object.
* @return
@ -235,7 +239,7 @@ static inline void __mempool_write_trailer_cookie(void *obj)
#endif /* RTE_LIBRTE_MEMPOOL_DEBUG */
/**
* Check and update cookies or panic.
* @internal Check and update cookies or panic.
*
* @param mp
* Pointer to the memory pool.
@ -344,10 +348,7 @@ typedef void (rte_mempool_ctor_t)(struct rte_mempool *, void *);
* Creates a new mempool named *name* in memory.
*
* This function uses ``memzone_reserve()`` to allocate memory. The
* pool contains n elements of elt_size. Its size is set to n. By
* default, bulk_default_count (the default number of elements to
* get/put in the pool) is set to 1. @see rte_mempool_set_bulk_count()
* to modify this valule.
* pool contains n elements of elt_size. Its size is set to n.
*
* @param name
* The name of the mempool.
@ -430,45 +431,6 @@ rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
int socket_id, unsigned flags);
/**
* Set the default bulk count for put/get.
*
* The *count* parameter is the default number of bulk elements to
* get/put when using ``rte_mempool_*_{en,de}queue_bulk()``. It must
* be greater than 0 and less than half of the mempool size.
*
* @param mp
* A pointer to the mempool structure.
* @param count
* A new water mark value.
* @return
* - 0: Success; default_bulk_count changed.
* - -EINVAL: Invalid count value.
*/
static inline int
rte_mempool_set_bulk_count(struct rte_mempool *mp, unsigned count)
{
if (unlikely(count == 0 || count >= mp->size))
return -EINVAL;
mp->bulk_default = count;
return 0;
}
/**
* Get the default bulk count for put/get.
*
* @param mp
* A pointer to the mempool structure.
* @return
* The default bulk count for enqueue/dequeue.
*/
static inline unsigned
rte_mempool_get_bulk_count(struct rte_mempool *mp)
{
return mp->bulk_default;
}
/**
* Dump the status of the mempool to the console.
*
@ -495,11 +457,11 @@ __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
{
#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
struct rte_mempool_cache *cache;
uint32_t cache_len;
uint32_t index;
void **cache_objs;
unsigned lcore_id = rte_lcore_id();
uint32_t cache_size = mp->cache_size;
uint32_t cache_add_count;
uint32_t flushthresh = mp->cache_flushthresh;
#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
/* increment stat now, adding in mempool always success */
@ -510,52 +472,35 @@ __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
if (unlikely(cache_size == 0 || is_mp == 0))
goto ring_enqueue;
cache = &mp->local_cache[lcore_id];
cache_len = cache->len;
cache_objs = cache->objs;
/* cache is full and we add many objects: enqueue in ring */
if (unlikely(cache_len == cache_size && n >= cache_size))
/* Go straight to ring if put would overflow mem allocated for cache */
if (unlikely(n > RTE_MEMPOOL_CACHE_MAX_SIZE))
goto ring_enqueue;
cache = &mp->local_cache[lcore_id];
cache_objs = &cache->objs[cache->len];
/*
* cache is full and we add few objects: enqueue the content
* of the cache in ring
* The cache follows the following algorithm
* 1. Add the objects to the cache
* 2. Anything greater than the cache min value (if it crosses the
* cache flush threshold) is flushed to the ring.
*/
if (unlikely(cache_len == cache_size)) {
#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
if (rte_ring_mp_enqueue_bulk(mp->ring, cache->objs,
cache_size) < 0)
rte_panic("cannot put objects in mempool\n");
#else
rte_ring_mp_enqueue_bulk(mp->ring, cache->objs,
cache_size);
#endif
cache_len = 0;
/* Add elements back into the cache */
for (index = 0; index < n; ++index, obj_table++)
cache_objs[index] = *obj_table;
cache->len += n;
if (cache->len >= flushthresh) {
rte_ring_mp_enqueue_bulk(mp->ring, &cache->objs[cache_size],
cache->len - cache_size);
cache->len = cache_size;
}
/* determine how many objects we can add in cache */
if (likely(n <= cache_size - cache_len))
cache_add_count = n;
else
cache_add_count = cache_size - cache_len;
return;
/* add in cache while there is enough room */
while (cache_add_count > 0) {
cache_objs[cache_len] = *obj_table;
obj_table++;
cache_len++;
n--;
cache_add_count--;
}
cache->len = cache_len;
/* no more object to add, return */
if (likely(n == 0))
return;
ring_enqueue:
ring_enqueue:
#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
/* push remaining objects in ring */
@ -705,62 +650,50 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table,
#endif
#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
struct rte_mempool_cache *cache;
uint32_t cache_len, cache_len_save = 0;
uint32_t index, len;
void **cache_objs;
unsigned lcore_id = rte_lcore_id();
uint32_t cache_size = mp->cache_size;
uint32_t cache_del_count;
cache = &mp->local_cache[lcore_id];
/* cache is not enabled or single consumer */
if (unlikely(cache_size == 0 || is_mc == 0))
if (unlikely(cache_size == 0 || is_mc == 0 || n >= cache_size))
goto ring_dequeue;
cache_len = cache->len;
cache_objs = cache->objs;
/* cache is empty and we need many objects: dequeue from ring */
if (unlikely(cache_len == 0 && n >= cache_size))
goto ring_dequeue;
/* Can this be satisfied from the cache? */
if (cache->len < n) {
/* No. Backfill the cache first, and then fill from it */
uint32_t req = n + (cache_size - cache->len);
/* cache is empty and we dequeue few objects: fill the cache first */
if (unlikely(cache_len == 0 && n < cache_size)) {
ret = rte_ring_mc_dequeue_bulk(mp->ring, cache_objs,
cache_size);
/* How many do we require i.e. number to fill the cache + the request */
ret = rte_ring_mc_dequeue_bulk(mp->ring, &cache->objs[cache->len], req);
if (unlikely(ret < 0)) {
__MEMPOOL_STAT_ADD(mp, get_fail, n_orig);
return ret;
/*
* In the offchance that we are buffer constrained,
* where we are not able to allocate cache + n, go to
* the ring directly. If that fails, we are truly out of
* buffers.
*/
goto ring_dequeue;
}
cache_len = cache_size;
cache->len += req;
}
if (likely(n <= cache_len))
cache_del_count = n;
else
cache_del_count = cache_len;
/* Now fill in the response ... */
for (index = 0, len = cache->len - 1; index < n; ++index, len--, obj_table++)
*obj_table = cache_objs[len];
cache_len_save = cache_len;
cache->len -= n;
/* add in cache only while there is enough room */
while (cache_del_count > 0) {
cache_len--;
*obj_table = cache_objs[cache_len];
obj_table++;
n--;
cache_del_count--;
}
__MEMPOOL_STAT_ADD(mp, get_success, n_orig);
cache->len = cache_len;
return 0;
/* no more object to get, return */
if (likely(n == 0)) {
__MEMPOOL_STAT_ADD(mp, get_success, n_orig);
return 0;
}
ring_dequeue:
ring_dequeue:
#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
/* get remaining objects from ring */
@ -769,15 +702,6 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table,
else
ret = rte_ring_sc_dequeue_bulk(mp->ring, obj_table, n);
#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
/*
* bad luck, the ring is empty but we already dequeued some
* entries from cache, we have to restore them
*/
if (unlikely(ret < 0 && cache_len_save != 0))
cache->len = cache_len_save;
#endif
if (ret < 0)
__MEMPOOL_STAT_ADD(mp, get_fail, n_orig);
else