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authorJavier González <javier@javigon.com>2018-06-01 17:41:14 +0300
committerJens Axboe <axboe@kernel.dk>2018-06-01 18:02:53 +0300
commit9cfd5a95381e960bdbc5cd24ec7987205a3a9bee (patch)
treeeeeae46b5f4f72b3e6f174f12e3d1b885072c8f6 /drivers/lightnvm
parentcc9c9a00b10eaf33abe1cece2c05ea34601af21b (diff)
downloadlinux-9cfd5a95381e960bdbc5cd24ec7987205a3a9bee.tar.xz
lightnvm: pblk: take bitmap alloc. out of critical section
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 <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/lightnvm')
-rw-r--r--drivers/lightnvm/pblk-core.c97
1 files changed, 56 insertions, 41 deletions
diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index a5750534efed..ed9cc977c8b3 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;