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>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 8b643d0bffae..81e8ed4d31ea 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
@@ -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);