lightnvm: pblk: reduce L2P memory footprint

Currently L2P map size is calculated based on the total number of
available sectors, which is redundant, since it contains mapping for
overprovisioning as well (11% by default).

Change this size to the real capacity and thus reduce the memory
footprint significantly - with default op value it is approx.
110MB of DRAM less for every 1TB of media.

Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Reviewed-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Reviewed-by: Javier González <javier@javigon.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index 6ca8688..fac3213 100644 (file)
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -2023,7 +2023,7 @@ 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;
        }
@@ -2063,7 +2063,7 @@ 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;
        }
@@ -2109,7 +2109,7 @@ 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;
        }
@@ -2167,7 +2167,7 @@ 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 8b643d0..81e8ed4 100644 (file)
--- 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
@@ -170,7 +170,7 @@ 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);
@@ -701,7 +701,6 @@ 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;
@@ -1284,7 +1283,7 @@ 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 0b7d5fb..b8eb6bd 100644 (file)
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -568,7 +568,7 @@ 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 d86f580..83b467b 100644 (file)
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -474,7 +474,7 @@ retry_rq:
 
                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 ac3ab77..58da72d 100644 (file)
--- 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) */