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Subject[PATCH 3/5] lightnvm: pblk: decouple read/erase mempools
Date
Since read and erase paths offer different guarantees for inflight I/Os,
separate the mempools to set the right min_nr for each on creation.

Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Javier González <javier@cnexlabs.com>
---
drivers/lightnvm/pblk-core.c | 12 ++++--------
drivers/lightnvm/pblk-init.c | 22 +++++++++++++++-------
drivers/lightnvm/pblk.h | 5 +++--
3 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index b7a6b223b1a5..9e35ec7c1d9f 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -64,7 +64,7 @@ static void pblk_end_io_erase(struct nvm_rq *rqd)
struct pblk *pblk = rqd->private;

__pblk_end_io_erase(pblk, rqd);
- mempool_free(rqd, pblk->g_rq_pool);
+ mempool_free(rqd, pblk->e_rq_pool);
}

void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
@@ -161,13 +161,11 @@ struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw)
pool = pblk->w_rq_pool;
rq_size = pblk_w_rq_size;
} else {
- pool = pblk->g_rq_pool;
+ pool = pblk->r_rq_pool;
rq_size = pblk_g_rq_size;
}

rqd = mempool_alloc(pool, GFP_KERNEL);
- if (!rqd)
- return NULL;
memset(rqd, 0, rq_size);

return rqd;
@@ -180,7 +178,7 @@ void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw)
if (rw == WRITE)
pool = pblk->w_rq_pool;
else
- pool = pblk->g_rq_pool;
+ pool = pblk->r_rq_pool;

mempool_free(rqd, pool);
}
@@ -1479,9 +1477,7 @@ int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
struct nvm_rq *rqd;
int err;

- rqd = mempool_alloc(pblk->g_rq_pool, GFP_KERNEL);
- if (!rqd)
- return -ENOMEM;
+ rqd = mempool_alloc(pblk->e_rq_pool, GFP_KERNEL);
memset(rqd, 0, pblk_g_rq_size);

pblk_setup_e_rq(pblk, rqd, ppa);
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 0c65abb96dc6..5f8a9fd2f29a 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -261,15 +261,20 @@ static int pblk_core_init(struct pblk *pblk)
if (!pblk->rec_pool)
goto free_gen_ws_pool;

- pblk->g_rq_pool = mempool_create_slab_pool(PBLK_READ_REQ_POOL_SIZE,
+ pblk->r_rq_pool = mempool_create_slab_pool(geo->nr_luns,
pblk_g_rq_cache);
- if (!pblk->g_rq_pool)
+ if (!pblk->r_rq_pool)
goto free_rec_pool;

- pblk->w_rq_pool = mempool_create_slab_pool(geo->nr_luns * 2,
+ pblk->e_rq_pool = mempool_create_slab_pool(geo->nr_luns,
+ pblk_g_rq_cache);
+ if (!pblk->e_rq_pool)
+ goto free_r_rq_pool;
+
+ pblk->w_rq_pool = mempool_create_slab_pool(geo->nr_luns,
pblk_w_rq_cache);
if (!pblk->w_rq_pool)
- goto free_g_rq_pool;
+ goto free_e_rq_pool;

pblk->line_meta_pool =
mempool_create_slab_pool(PBLK_META_POOL_SIZE,
@@ -304,8 +309,10 @@ static int pblk_core_init(struct pblk *pblk)
mempool_destroy(pblk->line_meta_pool);
free_w_rq_pool:
mempool_destroy(pblk->w_rq_pool);
-free_g_rq_pool:
- mempool_destroy(pblk->g_rq_pool);
+free_e_rq_pool:
+ mempool_destroy(pblk->e_rq_pool);
+free_r_rq_pool:
+ mempool_destroy(pblk->r_rq_pool);
free_rec_pool:
mempool_destroy(pblk->rec_pool);
free_gen_ws_pool:
@@ -326,7 +333,8 @@ static void pblk_core_free(struct pblk *pblk)
mempool_destroy(pblk->page_bio_pool);
mempool_destroy(pblk->gen_ws_pool);
mempool_destroy(pblk->rec_pool);
- mempool_destroy(pblk->g_rq_pool);
+ mempool_destroy(pblk->r_rq_pool);
+ mempool_destroy(pblk->e_rq_pool);
mempool_destroy(pblk->w_rq_pool);
mempool_destroy(pblk->line_meta_pool);

diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index dee8f66e6ce2..0120e0ade703 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -41,7 +41,6 @@
#define PBLK_MAX_REQ_ADDRS_PW (6)

#define PBLK_META_POOL_SIZE (128)
-#define PBLK_READ_REQ_POOL_SIZE (1024)

#define PBLK_NR_CLOSE_JOBS (4)

@@ -60,6 +59,7 @@

#define ERASE 2 /* READ = 0, WRITE = 1 */

+/* Static pool sizes */
#define PBLK_GEN_WS_POOL_SIZE (2)

enum {
@@ -623,8 +623,9 @@ struct pblk {
mempool_t *page_bio_pool;
mempool_t *gen_ws_pool;
mempool_t *rec_pool;
- mempool_t *g_rq_pool;
+ mempool_t *r_rq_pool;
mempool_t *w_rq_pool;
+ mempool_t *e_rq_pool;
mempool_t *line_meta_pool;

struct workqueue_struct *close_wq;
--
2.7.4
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