From: "Javier González" <jg@lightnvm.io>
To: axboe@fb.com
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
"Javier González" <javier@cnexlabs.com>
Subject: [PATCH 4/5] lightnvm: pblk: do not use a mempool for line bitmaps
Date: Thu, 14 Sep 2017 12:33:46 +0200 [thread overview]
Message-ID: <1505385227-28706-5-git-send-email-javier@cnexlabs.com> (raw)
In-Reply-To: <1505385227-28706-1-git-send-email-javier@cnexlabs.com>
pblk holds two sector bitmaps: one to keep track of the mapped sectors
while the line is active and another one to keep track of the invalid
sectors. The latter is kept during the whole live of the line, until it
is recycled. Since we cannot guarantee forward progress for the mempool
in this case, get rid of the mempool and simply allocate memory through
kmalloc.
Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Javier González <javier@cnexlabs.com>
---
drivers/lightnvm/pblk-core.c | 26 ++++++++++----------------
drivers/lightnvm/pblk-init.c | 29 ++---------------------------
drivers/lightnvm/pblk-recovery.c | 2 +-
drivers/lightnvm/pblk-write.c | 4 +---
drivers/lightnvm/pblk.h | 3 ---
5 files changed, 14 insertions(+), 50 deletions(-)
diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index 9e35ec7c1d9f..bb53fe416d4e 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -1093,25 +1093,21 @@ 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);
- line->map_bitmap = mempool_alloc(pblk->line_meta_pool, GFP_ATOMIC);
+ line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC);
if (!line->map_bitmap)
return -ENOMEM;
- memset(line->map_bitmap, 0, lm->sec_bitmap_len);
- /* invalid_bitmap is special since it is used when line is closed. No
- * need to zeroized; it will be initialized using bb info form
- * map_bitmap
- */
- line->invalid_bitmap = mempool_alloc(pblk->line_meta_pool, GFP_ATOMIC);
+ /* will be initialized using bb info from map_bitmap */
+ line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_ATOMIC);
if (!line->invalid_bitmap) {
- mempool_free(line->map_bitmap, pblk->line_meta_pool);
+ kfree(line->map_bitmap);
return -ENOMEM;
}
spin_lock(&line->lock);
if (line->state != PBLK_LINESTATE_FREE) {
- mempool_free(line->invalid_bitmap, pblk->line_meta_pool);
- mempool_free(line->map_bitmap, pblk->line_meta_pool);
+ kfree(line->map_bitmap);
+ kfree(line->invalid_bitmap);
spin_unlock(&line->lock);
WARN(1, "pblk: corrupted line %d, state %d\n",
line->id, line->state);
@@ -1163,7 +1159,7 @@ int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
{
- mempool_free(line->map_bitmap, pblk->line_meta_pool);
+ kfree(line->map_bitmap);
line->map_bitmap = NULL;
line->smeta = NULL;
line->emeta = NULL;
@@ -1438,10 +1434,8 @@ void pblk_line_replace_data(struct pblk *pblk)
void pblk_line_free(struct pblk *pblk, struct pblk_line *line)
{
- if (line->map_bitmap)
- mempool_free(line->map_bitmap, pblk->line_meta_pool);
- if (line->invalid_bitmap)
- mempool_free(line->invalid_bitmap, pblk->line_meta_pool);
+ kfree(line->map_bitmap);
+ kfree(line->invalid_bitmap);
*line->vsc = cpu_to_le32(EMPTY_ENTRY);
@@ -1582,7 +1576,7 @@ void pblk_line_close(struct pblk *pblk, struct pblk_line *line)
list_add_tail(&line->list, move_list);
- mempool_free(line->map_bitmap, pblk->line_meta_pool);
+ kfree(line->map_bitmap);
line->map_bitmap = NULL;
line->smeta = NULL;
line->emeta = NULL;
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 5f8a9fd2f29a..df86cf98ef4d 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -21,7 +21,7 @@
#include "pblk.h"
static struct kmem_cache *pblk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
- *pblk_w_rq_cache, *pblk_line_meta_cache;
+ *pblk_w_rq_cache;
static DECLARE_RWSEM(pblk_lock);
struct bio_set *pblk_bio_set;
@@ -181,8 +181,6 @@ static int pblk_set_ppaf(struct pblk *pblk)
static int pblk_init_global_caches(struct pblk *pblk)
{
- char cache_name[PBLK_CACHE_NAME_LEN];
-
down_write(&pblk_lock);
pblk_ws_cache = kmem_cache_create("pblk_blk_ws",
sizeof(struct pblk_line_ws), 0, 0, NULL);
@@ -217,19 +215,6 @@ static int pblk_init_global_caches(struct pblk *pblk)
up_write(&pblk_lock);
return -ENOMEM;
}
-
- snprintf(cache_name, sizeof(cache_name), "pblk_line_m_%s",
- pblk->disk->disk_name);
- pblk_line_meta_cache = kmem_cache_create(cache_name,
- pblk->lm.sec_bitmap_len, 0, 0, NULL);
- if (!pblk_line_meta_cache) {
- kmem_cache_destroy(pblk_ws_cache);
- kmem_cache_destroy(pblk_rec_cache);
- kmem_cache_destroy(pblk_g_rq_cache);
- kmem_cache_destroy(pblk_w_rq_cache);
- up_write(&pblk_lock);
- return -ENOMEM;
- }
up_write(&pblk_lock);
return 0;
@@ -276,16 +261,10 @@ static int pblk_core_init(struct pblk *pblk)
if (!pblk->w_rq_pool)
goto free_e_rq_pool;
- pblk->line_meta_pool =
- mempool_create_slab_pool(PBLK_META_POOL_SIZE,
- pblk_line_meta_cache);
- if (!pblk->line_meta_pool)
- goto free_w_rq_pool;
-
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;
+ goto free_w_rq_pool;
pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
@@ -305,8 +284,6 @@ static int pblk_core_init(struct pblk *pblk)
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:
mempool_destroy(pblk->w_rq_pool);
free_e_rq_pool:
@@ -336,13 +313,11 @@ static void pblk_core_free(struct pblk *pblk)
mempool_destroy(pblk->r_rq_pool);
mempool_destroy(pblk->e_rq_pool);
mempool_destroy(pblk->w_rq_pool);
- mempool_destroy(pblk->line_meta_pool);
kmem_cache_destroy(pblk_ws_cache);
kmem_cache_destroy(pblk_rec_cache);
kmem_cache_destroy(pblk_g_rq_cache);
kmem_cache_destroy(pblk_w_rq_cache);
- kmem_cache_destroy(pblk_line_meta_cache);
}
static void pblk_luns_free(struct pblk *pblk)
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index cb556e06673e..10eef9281a27 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -987,7 +987,7 @@ struct pblk_line *pblk_recov_l2p(struct pblk *pblk)
list_move_tail(&line->list, move_list);
spin_unlock(&l_mg->gc_lock);
- mempool_free(line->map_bitmap, pblk->line_meta_pool);
+ kfree(line->map_bitmap);
line->map_bitmap = NULL;
line->smeta = NULL;
line->emeta = NULL;
diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
index 81d1f1035fa3..3277cee36784 100644
--- a/drivers/lightnvm/pblk-write.c
+++ b/drivers/lightnvm/pblk-write.c
@@ -414,8 +414,6 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
if (emeta->mem >= lm->emeta_len[0]) {
spin_lock(&l_mg->close_lock);
list_del(&meta_line->list);
- WARN(!bitmap_full(meta_line->map_bitmap, lm->sec_per_line),
- "pblk: corrupt meta line %d\n", meta_line->id);
spin_unlock(&l_mg->close_lock);
}
@@ -459,7 +457,7 @@ static int pblk_sched_meta_io(struct pblk *pblk, struct ppa_addr *prev_list,
return 0;
}
meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list);
- if (bitmap_full(meta_line->map_bitmap, lm->sec_per_line))
+ if (meta_line->emeta->mem >= lm->emeta_len[0])
goto retry;
spin_unlock(&l_mg->close_lock);
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 0120e0ade703..469976a20421 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -40,8 +40,6 @@
#define PBLK_MAX_REQ_ADDRS (64)
#define PBLK_MAX_REQ_ADDRS_PW (6)
-#define PBLK_META_POOL_SIZE (128)
-
#define PBLK_NR_CLOSE_JOBS (4)
#define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16)
@@ -626,7 +624,6 @@ struct pblk {
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;
struct workqueue_struct *bb_wq;
--
2.7.4
next prev parent reply other threads:[~2017-09-14 10:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-14 10:33 [PATCH 0/5] lightnvm: pblk: audit mempool usage Javier González
2017-09-14 10:33 ` [PATCH 1/5] lightnvm: pblk: fix min size for page mempool Javier González
2017-09-14 10:33 ` [PATCH 2/5] lightnvm: pblk: simplify work_queue mempool Javier González
2017-09-14 10:33 ` [PATCH 3/5] lightnvm: pblk: decouple read/erase mempools Javier González
2017-09-14 10:33 ` Javier González [this message]
2017-09-14 10:33 ` [PATCH 5/5] lightnvm: pblk: remove checks on mempool alloc Javier González
2017-10-02 17:58 ` [PATCH 0/5] lightnvm: pblk: audit mempool usage Rakesh Pandit
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1505385227-28706-5-git-send-email-javier@cnexlabs.com \
--to=jg@lightnvm.io \
--cc=axboe@fb.com \
--cc=javier@cnexlabs.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).