From 9cfd5a95381e960bdbc5cd24ec7987205a3a9bee Mon Sep 17 00:00:00 2001 From: =?utf8?q?Javier=20Gonz=C3=A1lez?= Date: Fri, 1 Jun 2018 16:41:14 +0200 Subject: [PATCH] lightnvm: pblk: take bitmap alloc. out of critical section MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit pblk allocates line bitmaps within the line lock unnecessarily. In order to take pressure out of the fast patch, allocate line bitmaps outside of this lock and refactor accordingly. Signed-off-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/pblk-core.c | 97 +++++++++++++++++++++++++------------------- 1 file changed, 56 insertions(+), 41 deletions(-) diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c index a575053..ed9cc97 100644 --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -1067,6 +1067,25 @@ static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line, return 1; } +static int pblk_line_alloc_bitmaps(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + + line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_KERNEL); + if (!line->map_bitmap) + return -ENOMEM; + + /* will be initialized using bb info from map_bitmap */ + line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_KERNEL); + if (!line->invalid_bitmap) { + kfree(line->map_bitmap); + line->map_bitmap = NULL; + return -ENOMEM; + } + + return 0; +} + /* For now lines are always assumed full lines. Thus, smeta former and current * lun bitmaps are omitted. */ @@ -1171,18 +1190,7 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line) { struct pblk_line_meta *lm = &pblk->lm; int blk_in_line = atomic_read(&line->blk_in_line); - int blk_to_erase, ret; - - line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC); - if (!line->map_bitmap) - return -ENOMEM; - - /* will be initialized using bb info from map_bitmap */ - line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_ATOMIC); - if (!line->invalid_bitmap) { - ret = -ENOMEM; - goto fail_free_map_bitmap; - } + int blk_to_erase; /* Bad blocks do not need to be erased */ bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line); @@ -1200,15 +1208,15 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line) } if (blk_in_line < lm->min_blk_line) { - ret = -EAGAIN; - goto fail_free_invalid_bitmap; + spin_unlock(&line->lock); + return -EAGAIN; } if (line->state != PBLK_LINESTATE_FREE) { WARN(1, "pblk: corrupted line %d, state %d\n", line->id, line->state); - ret = -EINTR; - goto fail_free_invalid_bitmap; + spin_unlock(&line->lock); + return -EINTR; } line->state = PBLK_LINESTATE_OPEN; @@ -1222,16 +1230,6 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line) kref_init(&line->ref); return 0; - -fail_free_invalid_bitmap: - spin_unlock(&line->lock); - kfree(line->invalid_bitmap); - line->invalid_bitmap = NULL; -fail_free_map_bitmap: - kfree(line->map_bitmap); - line->map_bitmap = NULL; - - return ret; } int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line) @@ -1251,13 +1249,16 @@ int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line) } spin_unlock(&l_mg->free_lock); - pblk_rl_free_lines_dec(&pblk->rl, line, true); + ret = pblk_line_alloc_bitmaps(pblk, line); + if (ret) + return ret; if (!pblk_line_init_bb(pblk, line, 0)) { list_add(&line->list, &l_mg->free_list); return -EINTR; } + pblk_rl_free_lines_dec(&pblk->rl, line, true); return 0; } @@ -1269,6 +1270,24 @@ void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line) line->emeta = NULL; } +static void pblk_line_reinit(struct pblk_line *line) +{ + *line->vsc = cpu_to_le32(EMPTY_ENTRY); + + line->map_bitmap = NULL; + line->invalid_bitmap = NULL; + line->smeta = NULL; + line->emeta = NULL; +} + +void pblk_line_free(struct pblk_line *line) +{ + kfree(line->map_bitmap); + kfree(line->invalid_bitmap); + + pblk_line_reinit(line); +} + struct pblk_line *pblk_line_get(struct pblk *pblk) { struct pblk_line_mgmt *l_mg = &pblk->l_mg; @@ -1335,11 +1354,14 @@ retry: return NULL; } + retry_line->map_bitmap = line->map_bitmap; + retry_line->invalid_bitmap = line->invalid_bitmap; retry_line->smeta = line->smeta; retry_line->emeta = line->emeta; retry_line->meta_line = line->meta_line; - pblk_line_free(line); + pblk_line_reinit(line); + l_mg->data_line = retry_line; spin_unlock(&l_mg->free_lock); @@ -1392,6 +1414,9 @@ struct pblk_line *pblk_line_get_first_data(struct pblk *pblk) } spin_unlock(&l_mg->free_lock); + if (pblk_line_alloc_bitmaps(pblk, line)) + return NULL; + if (pblk_line_erase(pblk, line)) { line = pblk_line_retry(pblk, line); if (!line) @@ -1536,6 +1561,9 @@ retry_erase: goto retry_erase; } + if (pblk_line_alloc_bitmaps(pblk, new)) + return NULL; + retry_setup: if (!pblk_line_init_metadata(pblk, new, cur)) { new = pblk_line_retry(pblk, new); @@ -1575,19 +1603,6 @@ out: return new; } -void pblk_line_free(struct pblk_line *line) -{ - kfree(line->map_bitmap); - kfree(line->invalid_bitmap); - - *line->vsc = cpu_to_le32(EMPTY_ENTRY); - - line->map_bitmap = NULL; - line->invalid_bitmap = NULL; - line->smeta = NULL; - line->emeta = NULL; -} - static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line) { struct pblk_line_mgmt *l_mg = &pblk->l_mg; -- 2.7.4