lightnvm: pblk: set mempool and workqueue params.

Make constants to define sizes for internal mempools and workqueues. In
this process, adjust the values to be more meaningful given the internal
constrains of the FTL. In order to do this for workqueues, separate the
current auxiliary workqueue into two dedicated workqueues to manage
lines being closed and bad blocks.
Signed-off-by: NJavier González <javier@cnexlabs.com>
Signed-off-by: NMatias Bjørling <matias@cnexlabs.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-core.c

@@ -33,7 +33,7 @@ static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
 		pr_err("pblk: attempted to erase bb: line:%d, pos:%d\n",
 							line->id, pos);
 
-	pblk_line_run_ws(pblk, NULL, ppa, pblk_line_mark_bb);
+	pblk_line_run_ws(pblk, NULL, ppa, pblk_line_mark_bb, pblk->bb_wq);
 }
 
 static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
@@ -1528,7 +1528,8 @@ void pblk_line_mark_bb(struct work_struct *work)
 }
 
 void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
-		      void (*work)(struct work_struct *))
+		      void (*work)(struct work_struct *),
+		      struct workqueue_struct *wq)
 {
 	struct pblk_line_ws *line_ws;
 
@@ -1541,7 +1542,7 @@ void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
 	line_ws->priv = priv;
 
 	INIT_WORK(&line_ws->ws, work);
-	queue_work(pblk->kw_wq, &line_ws->ws);
+	queue_work(wq, &line_ws->ws);
 }
 
 void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,

drivers/lightnvm/pblk-init.c

@@ -251,7 +251,7 @@ static int pblk_core_init(struct pblk *pblk)
 	if (!pblk->page_pool)
 		return -ENOMEM;
 
-	pblk->line_ws_pool = mempool_create_slab_pool(geo->nr_luns,
+	pblk->line_ws_pool = mempool_create_slab_pool(PBLK_WS_POOL_SIZE,
 							pblk_blk_ws_cache);
 	if (!pblk->line_ws_pool)
 		goto free_page_pool;
@@ -260,35 +260,45 @@ static int pblk_core_init(struct pblk *pblk)
 	if (!pblk->rec_pool)
 		goto free_blk_ws_pool;
 
-	pblk->g_rq_pool = mempool_create_slab_pool(64, pblk_g_rq_cache);
+	pblk->g_rq_pool = mempool_create_slab_pool(PBLK_READ_REQ_POOL_SIZE,
+							pblk_g_rq_cache);
 	if (!pblk->g_rq_pool)
 		goto free_rec_pool;
 
-	pblk->w_rq_pool = mempool_create_slab_pool(64, pblk_w_rq_cache);
+	pblk->w_rq_pool = mempool_create_slab_pool(geo->nr_luns * 2,
+							pblk_w_rq_cache);
 	if (!pblk->w_rq_pool)
 		goto free_g_rq_pool;
 
 	pblk->line_meta_pool =
-			mempool_create_slab_pool(16, pblk_line_meta_cache);
+			mempool_create_slab_pool(PBLK_META_POOL_SIZE,
+							pblk_line_meta_cache);
 	if (!pblk->line_meta_pool)
 		goto free_w_rq_pool;
 
-	pblk->kw_wq = alloc_workqueue("pblk-aux-wq",
-					WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
-	if (!pblk->kw_wq)
+	pblk->close_wq = alloc_workqueue("pblk-close-wq",
+			WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
+	if (!pblk->close_wq)
 		goto free_line_meta_pool;
 
+	pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
+			WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
+	if (!pblk->bb_wq)
+		goto free_close_wq;
+
 	if (pblk_set_ppaf(pblk))
-		goto free_kw_wq;
+		goto free_bb_wq;
 
 	if (pblk_rwb_init(pblk))
-		goto free_kw_wq;
+		goto free_bb_wq;
 
 	INIT_LIST_HEAD(&pblk->compl_list);
 	return 0;
 
-free_kw_wq:
-	destroy_workqueue(pblk->kw_wq);
+free_bb_wq:
+	destroy_workqueue(pblk->bb_wq);
+free_close_wq:
+	destroy_workqueue(pblk->close_wq);
 free_line_meta_pool:
 	mempool_destroy(pblk->line_meta_pool);
 free_w_rq_pool:
@@ -306,8 +316,11 @@ static int pblk_core_init(struct pblk *pblk)
 
 static void pblk_core_free(struct pblk *pblk)
 {
-	if (pblk->kw_wq)
-		destroy_workqueue(pblk->kw_wq);
+	if (pblk->close_wq)
+		destroy_workqueue(pblk->close_wq);
+
+	if (pblk->bb_wq)
+		destroy_workqueue(pblk->bb_wq);
 
 	mempool_destroy(pblk->page_pool);
 	mempool_destroy(pblk->line_ws_pool);

drivers/lightnvm/pblk-write.c

@@ -150,7 +150,7 @@ static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd)
 	}
 
 	INIT_WORK(&recovery->ws_rec, pblk_submit_rec);
-	queue_work(pblk->kw_wq, &recovery->ws_rec);
+	queue_work(pblk->close_wq, &recovery->ws_rec);
 
 out:
 	pblk_complete_write(pblk, rqd, c_ctx);
@@ -198,7 +198,8 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd)
 
 	sync = atomic_add_return(rqd->nr_ppas, &emeta->sync);
 	if (sync == emeta->nr_entries)
-		pblk_line_run_ws(pblk, line, NULL, pblk_line_close_ws);
+		pblk_line_run_ws(pblk, line, NULL, pblk_line_close_ws,
+								pblk->close_wq);
 
 	bio_put(rqd->bio);
 	pblk_free_rqd(pblk, rqd, READ);

drivers/lightnvm/pblk.h

@@ -40,6 +40,12 @@
 #define PBLK_MAX_REQ_ADDRS (64)
 #define PBLK_MAX_REQ_ADDRS_PW (6)
 
+#define PBLK_WS_POOL_SIZE (128)
+#define PBLK_META_POOL_SIZE (128)
+#define PBLK_READ_REQ_POOL_SIZE (1024)
+
+#define PBLK_NR_CLOSE_JOBS (4)
+
 #define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16)
 
 #define PBLK_COMMAND_TIMEOUT_MS 30000
@@ -599,7 +605,9 @@ struct pblk {
 	mempool_t *w_rq_pool;
 	mempool_t *line_meta_pool;
 
-	struct workqueue_struct *kw_wq;
+	struct workqueue_struct *close_wq;
+	struct workqueue_struct *bb_wq;
+
 	struct timer_list wtimer;
 
 	struct pblk_gc gc;
@@ -692,7 +700,8 @@ void pblk_line_close(struct pblk *pblk, struct pblk_line *line);
 void pblk_line_close_ws(struct work_struct *work);
 void pblk_line_mark_bb(struct work_struct *work);
 void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
-		      void (*work)(struct work_struct *));
+		      void (*work)(struct work_struct *),
+		      struct workqueue_struct *wq);
 u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line);
 int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line);
 int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line,