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lightnvm: pblk: use exact free block counter in RL

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Until now, pblk's rate-limiter has used a heuristic to reserve space for
GC I/O given that the over-provision area was fixed.

In preparation for allowing to define the over-provision area on target
creation, define a dedicated free_block counter in the rate-limiter to
track the number of blocks being used for user data.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Javier González
2018-01-05 14:16:13 +01:00
committed by Jens Axboe
parent aed49e195a
commit a7689938ef
6 changed files with 73 additions and 46 deletions
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18
drivers/lightnvm/pblk-init.c
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@@ -579,22 +579,34 @@ static unsigned int calc_emeta_len(struct pblk *pblk)
static void pblk_set_provision(struct pblk *pblk, long nr_free_blks)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line_meta *lm = &pblk->lm;
struct nvm_geo *geo = &dev->geo;
sector_t provisioned;
int sec_meta, blk_meta;
pblk->over_pct = 20;
pblk->op = 20;
provisioned = nr_free_blks;
provisioned *= (100 - pblk->over_pct);
provisioned *= (100 - pblk->op);
sector_div(provisioned, 100);
pblk->op_blks = nr_free_blks - provisioned;
/* Internally pblk manages all free blocks, but all calculations based
* on user capacity consider only provisioned blocks
*/
pblk->rl.total_blocks = nr_free_blks;
pblk->rl.nr_secs = nr_free_blks * geo->sec_per_chk;
pblk->capacity = provisioned * geo->sec_per_chk;
/* Consider sectors used for metadata */
sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
blk_meta = DIV_ROUND_UP(sec_meta, geo->sec_per_chk);
pblk->capacity = (provisioned - blk_meta) * geo->sec_per_chk;
atomic_set(&pblk->rl.free_blocks, nr_free_blks);
atomic_set(&pblk->rl.free_user_blocks, nr_free_blks);
}
static int pblk_lines_alloc_metadata(struct pblk *pblk)