[PATCH 10/13] lightnvm: pblk: Reduce L2P DRAM footprint

Igor Konopko
2019-02-27T17:18:14Z

Currently L2P map size is calculated based on
the total number of available sectors, which is
redundant, since it contains some number of
over provisioning (11% by default).

The goal of this patch is to change this size
to the real capacity and thus reduce the DRAM
footprint significantly - with default op value
it is approx. 110MB of DRAM less for every 1TB
of pblk drive.

Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
---
drivers/lightnvm/pblk-core.c | 8 ++++----
drivers/lightnvm/pblk-init.c | 7 +++----
drivers/lightnvm/pblk-read.c | 2 +-
drivers/lightnvm/pblk-recovery.c | 2 +-
drivers/lightnvm/pblk.h | 1 -
5 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index f48f2e77f770..2e424c0275c1 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -2024,7 +2024,7 @@ void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
struct ppa_addr ppa_l2p;

/* logic error: lba out-of-bounds. Ignore update */
- if (!(lba < pblk->rl.nr_secs)) {
+ if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
return;
}
@@ -2064,7 +2064,7 @@ int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new,
#endif

/* logic error: lba out-of-bounds. Ignore update */
- if (!(lba < pblk->rl.nr_secs)) {
+ if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
return 0;
}
@@ -2110,7 +2110,7 @@ void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
}

/* logic error: lba out-of-bounds. Ignore update */
- if (!(lba < pblk->rl.nr_secs)) {
+ if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
return;
}
@@ -2168,7 +2168,7 @@ void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
lba = lba_list[i];
if (lba != ADDR_EMPTY) {
/* logic error: lba out-of-bounds. Ignore update */
- if (!(lba < pblk->rl.nr_secs)) {
+ if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
continue;
}
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index e553105b7ba1..9913a4514eb6 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -105,7 +105,7 @@ static size_t pblk_trans_map_size(struct pblk *pblk)
if (pblk->addrf_len < 32)
entry_size = 4;

- return entry_size * pblk->rl.nr_secs;
+ return entry_size * pblk->capacity;
}

#ifdef CONFIG_NVM_PBLK_DEBUG
@@ -175,7 +175,7 @@ static int pblk_l2p_init(struct pblk *pblk, bool factory_init)

pblk_ppa_set_empty(&ppa);

- for (i = 0; i < pblk->rl.nr_secs; i++)
+ for (i = 0; i < pblk->capacity; i++)
pblk_trans_map_set(pblk, i, ppa);

ret = pblk_l2p_recover(pblk, factory_init);
@@ -706,7 +706,6 @@ static int pblk_set_provision(struct pblk *pblk, int nr_free_chks)
* on user capacity consider only provisioned blocks
*/
pblk->rl.total_blocks = nr_free_chks;
- pblk->rl.nr_secs = nr_free_chks * geo->clba;

/* Consider sectors used for metadata */
sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
@@ -1289,7 +1288,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,

pblk_info(pblk, "luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
geo->all_luns, pblk->l_mg.nr_lines,
- (unsigned long long)pblk->rl.nr_secs,
+ (unsigned long long)pblk->capacity,
pblk->rwb.nr_entries);

wake_up_process(pblk->writer_ts);
diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index 39c1d6ccaedb..65697463def8 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -561,7 +561,7 @@ static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd,
goto out;

/* logic error: lba out-of-bounds */
- if (lba >= pblk->rl.nr_secs) {
+ if (lba >= pblk->capacity) {
WARN(1, "pblk: read lba out of bounds\n");
goto out;
}
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index d86f580036d3..83b467b5edc7 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -474,7 +474,7 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,

lba_list[paddr++] = cpu_to_le64(lba);

- if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
+ if (lba == ADDR_EMPTY || lba >= pblk->capacity)
continue;

line->nr_valid_lbas++;
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index a6386d5acd73..a92377530930 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -305,7 +305,6 @@ struct pblk_rl {

struct timer_list u_timer;

- unsigned long long nr_secs;
unsigned long total_blocks;

atomic_t free_blocks; /* Total number of free blocks (+ OP) */
--
2.17.1