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lightnvm: pblk: take bitmap alloc. out of critical section

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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>
This commit is contained in:
Javier González 2018-06-01 16:41:14 +02:00 committed by Jens Axboe
parent cc9c9a00b1
commit 9cfd5a9538
1 changed files with 56 additions and 41 deletions
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97
drivers/lightnvm/pblk-core.c
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@ -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 @@ static struct pblk_line *pblk_line_retry(struct pblk *pblk,
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 @@ struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
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 @@ struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
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;