forked from Minki/linux
bio: only mempool back the largest bio_vec slab cache
We only very rarely need the mempool backing, so it makes sense to get rid of all but one of the mempool in a bio_set. So keep the largest bio_vec count mempool so we can always honor the largest allocation, and "upgrade" callers that fail. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
parent
a31a97381c
commit
7ff9345ffa
129
fs/bio.c
129
fs/bio.c
@ -58,7 +58,8 @@ unsigned int bvec_nr_vecs(unsigned short idx)
|
||||
return bvec_slabs[idx].nr_vecs;
|
||||
}
|
||||
|
||||
struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs)
|
||||
struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx,
|
||||
struct bio_set *bs)
|
||||
{
|
||||
struct bio_vec *bvl;
|
||||
|
||||
@ -67,60 +68,90 @@ struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct
|
||||
* If not, this is a bio_kmalloc() allocation and just do a
|
||||
* kzalloc() for the exact number of vecs right away.
|
||||
*/
|
||||
if (bs) {
|
||||
/*
|
||||
* see comment near bvec_array define!
|
||||
*/
|
||||
switch (nr) {
|
||||
case 1:
|
||||
*idx = 0;
|
||||
break;
|
||||
case 2 ... 4:
|
||||
*idx = 1;
|
||||
break;
|
||||
case 5 ... 16:
|
||||
*idx = 2;
|
||||
break;
|
||||
case 17 ... 64:
|
||||
*idx = 3;
|
||||
break;
|
||||
case 65 ... 128:
|
||||
*idx = 4;
|
||||
break;
|
||||
case 129 ... BIO_MAX_PAGES:
|
||||
*idx = 5;
|
||||
break;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
if (!bs)
|
||||
bvl = kzalloc(nr * sizeof(struct bio_vec), gfp_mask);
|
||||
|
||||
/*
|
||||
* see comment near bvec_array define!
|
||||
*/
|
||||
switch (nr) {
|
||||
case 1:
|
||||
*idx = 0;
|
||||
break;
|
||||
case 2 ... 4:
|
||||
*idx = 1;
|
||||
break;
|
||||
case 5 ... 16:
|
||||
*idx = 2;
|
||||
break;
|
||||
case 17 ... 64:
|
||||
*idx = 3;
|
||||
break;
|
||||
case 65 ... 128:
|
||||
*idx = 4;
|
||||
break;
|
||||
case 129 ... BIO_MAX_PAGES:
|
||||
*idx = 5;
|
||||
break;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* idx now points to the pool we want to allocate from. only the
|
||||
* 1-vec entry pool is mempool backed.
|
||||
*/
|
||||
if (*idx == BIOVEC_MAX_IDX) {
|
||||
fallback:
|
||||
bvl = mempool_alloc(bs->bvec_pool, gfp_mask);
|
||||
} else {
|
||||
struct biovec_slab *bvs = bvec_slabs + *idx;
|
||||
gfp_t __gfp_mask = gfp_mask & ~(__GFP_WAIT | __GFP_IO);
|
||||
|
||||
/*
|
||||
* idx now points to the pool we want to allocate from
|
||||
* Make this allocation restricted and don't dump info on
|
||||
* allocation failures, since we'll fallback to the mempool
|
||||
* in case of failure.
|
||||
*/
|
||||
bvl = mempool_alloc(bs->bvec_pools[*idx], gfp_mask);
|
||||
if (bvl)
|
||||
memset(bvl, 0,
|
||||
bvec_nr_vecs(*idx) * sizeof(struct bio_vec));
|
||||
} else
|
||||
bvl = kzalloc(nr * sizeof(struct bio_vec), gfp_mask);
|
||||
__gfp_mask |= __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
|
||||
|
||||
/*
|
||||
* Try a slab allocation. If this fails and __GFP_WAIT
|
||||
* is set, retry with the 1-entry mempool
|
||||
*/
|
||||
bvl = kmem_cache_alloc(bvs->slab, __gfp_mask);
|
||||
if (unlikely(!bvl && (gfp_mask & __GFP_WAIT))) {
|
||||
*idx = BIOVEC_MAX_IDX;
|
||||
goto fallback;
|
||||
}
|
||||
}
|
||||
|
||||
if (bvl)
|
||||
memset(bvl, 0, bvec_nr_vecs(*idx) * sizeof(struct bio_vec));
|
||||
|
||||
return bvl;
|
||||
}
|
||||
|
||||
void bio_free(struct bio *bio, struct bio_set *bio_set)
|
||||
void bio_free(struct bio *bio, struct bio_set *bs)
|
||||
{
|
||||
if (bio->bi_io_vec) {
|
||||
const int pool_idx = BIO_POOL_IDX(bio);
|
||||
|
||||
BIO_BUG_ON(pool_idx >= BIOVEC_NR_POOLS);
|
||||
|
||||
mempool_free(bio->bi_io_vec, bio_set->bvec_pools[pool_idx]);
|
||||
if (pool_idx == BIOVEC_MAX_IDX)
|
||||
mempool_free(bio->bi_io_vec, bs->bvec_pool);
|
||||
else {
|
||||
struct biovec_slab *bvs = bvec_slabs + pool_idx;
|
||||
|
||||
kmem_cache_free(bvs->slab, bio->bi_io_vec);
|
||||
}
|
||||
}
|
||||
|
||||
if (bio_integrity(bio))
|
||||
bio_integrity_free(bio, bio_set);
|
||||
bio_integrity_free(bio, bs);
|
||||
|
||||
mempool_free(bio, bio_set->bio_pool);
|
||||
mempool_free(bio, bs->bio_pool);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1346,30 +1377,18 @@ EXPORT_SYMBOL(bio_sector_offset);
|
||||
*/
|
||||
static int biovec_create_pools(struct bio_set *bs, int pool_entries)
|
||||
{
|
||||
int i;
|
||||
struct biovec_slab *bp = bvec_slabs + BIOVEC_MAX_IDX;
|
||||
|
||||
for (i = 0; i < BIOVEC_NR_POOLS; i++) {
|
||||
struct biovec_slab *bp = bvec_slabs + i;
|
||||
mempool_t **bvp = bs->bvec_pools + i;
|
||||
bs->bvec_pool = mempool_create_slab_pool(pool_entries, bp->slab);
|
||||
if (!bs->bvec_pool)
|
||||
return -ENOMEM;
|
||||
|
||||
*bvp = mempool_create_slab_pool(pool_entries, bp->slab);
|
||||
if (!*bvp)
|
||||
return -ENOMEM;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void biovec_free_pools(struct bio_set *bs)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < BIOVEC_NR_POOLS; i++) {
|
||||
mempool_t *bvp = bs->bvec_pools[i];
|
||||
|
||||
if (bvp)
|
||||
mempool_destroy(bvp);
|
||||
}
|
||||
|
||||
mempool_destroy(bs->bvec_pool);
|
||||
}
|
||||
|
||||
void bioset_free(struct bio_set *bs)
|
||||
|
||||
@ -397,13 +397,14 @@ static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
|
||||
*/
|
||||
#define BIO_POOL_SIZE 2
|
||||
#define BIOVEC_NR_POOLS 6
|
||||
#define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
|
||||
|
||||
struct bio_set {
|
||||
mempool_t *bio_pool;
|
||||
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
||||
mempool_t *bio_integrity_pool;
|
||||
#endif
|
||||
mempool_t *bvec_pools[BIOVEC_NR_POOLS];
|
||||
mempool_t *bvec_pool;
|
||||
};
|
||||
|
||||
struct biovec_slab {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user