diff options
| author | Javier González <javier@cnexlabs.com> | 2018-01-05 16:16:13 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-01-05 18:50:12 +0300 |
| commit | a7689938ef4c8678ff78c44d11e4b0b897244714 (patch) | |
| tree | f16cd144c091907dd6ba81e495f4cfbac53c80a2 /drivers/lightnvm/pblk.h | |
| parent | aed49e195af6b621d59b3e7f85aa5c5a71e90050 (diff) | |
| download | linux-a7689938ef4c8678ff78c44d11e4b0b897244714.tar.xz | |
lightnvm: pblk: use exact free block counter in RL
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>
Diffstat (limited to 'drivers/lightnvm/pblk.h')
| -rw-r--r-- | drivers/lightnvm/pblk.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h index 5f7cd6faa8c7..1e719d4181ce 100644 --- a/drivers/lightnvm/pblk.h +++ b/drivers/lightnvm/pblk.h @@ -252,9 +252,6 @@ struct pblk_rl { unsigned int high; /* Upper threshold for rate limiter (free run - * user I/O rate limiter */ - unsigned int low; /* Lower threshold for rate limiter (user I/O - * rate limiter - stall) - */ unsigned int high_pw; /* High rounded up as a power of 2 */ #define PBLK_USER_HIGH_THRS 8 /* Begin write limit at 12% available blks */ @@ -288,7 +285,9 @@ struct pblk_rl { unsigned long long nr_secs; unsigned long total_blocks; - atomic_t free_blocks; + + atomic_t free_blocks; /* Total number of free blocks (+ OP) */ + atomic_t free_user_blocks; /* Number of user free blocks (no OP) */ }; #define PBLK_LINE_EMPTY (~0U) @@ -579,7 +578,9 @@ struct pblk { */ sector_t capacity; /* Device capacity when bad blocks are subtracted */ - int over_pct; /* Percentage of device used for over-provisioning */ + + int op; /* Percentage of device used for over-provisioning */ + int op_blks; /* Number of blocks used for over-provisioning */ /* pblk provisioning values. Used by rate limiter */ struct pblk_rl rl; @@ -839,6 +840,7 @@ void pblk_rl_free(struct pblk_rl *rl); void pblk_rl_update_rates(struct pblk_rl *rl); int pblk_rl_high_thrs(struct pblk_rl *rl); unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl); +unsigned long pblk_rl_nr_user_free_blks(struct pblk_rl *rl); int pblk_rl_user_may_insert(struct pblk_rl *rl, int nr_entries); void pblk_rl_inserted(struct pblk_rl *rl, int nr_entries); void pblk_rl_user_in(struct pblk_rl *rl, int nr_entries); @@ -847,7 +849,8 @@ void pblk_rl_gc_in(struct pblk_rl *rl, int nr_entries); void pblk_rl_out(struct pblk_rl *rl, int nr_user, int nr_gc); int pblk_rl_max_io(struct pblk_rl *rl); void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line); -void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line); +void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line, + bool used); int pblk_rl_is_limit(struct pblk_rl *rl); /* |