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lightnvm: pblk: reduce L2P memory footprint

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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>
This commit is contained in:
Igor Konopko
2019-05-04 20:37:48 +02:00
committed by Jens Axboe
parent 8935ebfc5d
commit 847a3a2788
5 changed files with 9 additions and 11 deletions
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drivers/lightnvm/pblk.h
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@@ -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) */