From b84ae4a8b883b96b95fff0e3979ff2c65bbf96b0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Javier=20Gonz=C3=A1lez?= Date: Fri, 13 Oct 2017 14:46:07 +0200 Subject: lightnvm: pblk: simplify work_queue mempool MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In pblk, we have a mempool to allocate a generic structure that we pass along workqueues. This is heavily used in the GC path in order to have enough inflight reads and fully utilize the GC bandwidth. However, the current GC path copies data to the host memory and puts it back into the write buffer. This requires a vmalloc allocation for the data and a memory copy. Thus, guaranteeing the allocation by using a mempool for the structure in itself does not give us much. Until we implement support for vector copy to avoid moving data through the host, just allocate the workqueue structure using kmalloc. This allows us to have a much smaller mempool. Reported-by: Jens Axboe Signed-off-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/pblk-gc.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) (limited to 'drivers/lightnvm/pblk-gc.c') diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c index 6090d28f7995..f163829ecca8 100644 --- a/drivers/lightnvm/pblk-gc.c +++ b/drivers/lightnvm/pblk-gc.c @@ -136,12 +136,12 @@ static void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line) static void pblk_gc_line_ws(struct work_struct *work) { - struct pblk_line_ws *line_rq_ws = container_of(work, + struct pblk_line_ws *gc_rq_ws = container_of(work, struct pblk_line_ws, ws); - struct pblk *pblk = line_rq_ws->pblk; + struct pblk *pblk = gc_rq_ws->pblk; struct pblk_gc *gc = &pblk->gc; - struct pblk_line *line = line_rq_ws->line; - struct pblk_gc_rq *gc_rq = line_rq_ws->priv; + struct pblk_line *line = gc_rq_ws->line; + struct pblk_gc_rq *gc_rq = gc_rq_ws->priv; up(&gc->gc_sem); @@ -151,7 +151,7 @@ static void pblk_gc_line_ws(struct work_struct *work) gc_rq->nr_secs); } - mempool_free(line_rq_ws, pblk->line_ws_pool); + kfree(gc_rq_ws); } static void pblk_gc_line_prepare_ws(struct work_struct *work) @@ -164,7 +164,7 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work) struct pblk_line_meta *lm = &pblk->lm; struct pblk_gc *gc = &pblk->gc; struct line_emeta *emeta_buf; - struct pblk_line_ws *line_rq_ws; + struct pblk_line_ws *gc_rq_ws; struct pblk_gc_rq *gc_rq; __le64 *lba_list; int sec_left, nr_secs, bit; @@ -223,19 +223,19 @@ next_rq: gc_rq->nr_secs = nr_secs; gc_rq->line = line; - line_rq_ws = mempool_alloc(pblk->line_ws_pool, GFP_KERNEL); - if (!line_rq_ws) + gc_rq_ws = kmalloc(sizeof(struct pblk_line_ws), GFP_KERNEL); + if (!gc_rq_ws) goto fail_free_gc_rq; - line_rq_ws->pblk = pblk; - line_rq_ws->line = line; - line_rq_ws->priv = gc_rq; + gc_rq_ws->pblk = pblk; + gc_rq_ws->line = line; + gc_rq_ws->priv = gc_rq; down(&gc->gc_sem); kref_get(&line->ref); - INIT_WORK(&line_rq_ws->ws, pblk_gc_line_ws); - queue_work(gc->gc_line_reader_wq, &line_rq_ws->ws); + INIT_WORK(&gc_rq_ws->ws, pblk_gc_line_ws); + queue_work(gc->gc_line_reader_wq, &gc_rq_ws->ws); sec_left -= nr_secs; if (sec_left > 0) @@ -243,7 +243,7 @@ next_rq: out: pblk_mfree(emeta_buf, l_mg->emeta_alloc_type); - mempool_free(line_ws, pblk->line_ws_pool); + kfree(line_ws); kref_put(&line->ref, pblk_line_put); atomic_dec(&gc->inflight_gc); @@ -256,7 +256,7 @@ fail_free_emeta: pblk_mfree(emeta_buf, l_mg->emeta_alloc_type); pblk_put_line_back(pblk, line); kref_put(&line->ref, pblk_line_put); - mempool_free(line_ws, pblk->line_ws_pool); + kfree(line_ws); atomic_dec(&gc->inflight_gc); pr_err("pblk: Failed to GC line %d\n", line->id); @@ -269,7 +269,7 @@ static int pblk_gc_line(struct pblk *pblk, struct pblk_line *line) pr_debug("pblk: line '%d' being reclaimed for GC\n", line->id); - line_ws = mempool_alloc(pblk->line_ws_pool, GFP_KERNEL); + line_ws = kmalloc(sizeof(struct pblk_line_ws), GFP_KERNEL); if (!line_ws) return -ENOMEM; -- cgit v1.2.3