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authorJavier González <javier@javigon.com>2019-03-07 15:18:53 +0300
committerJens Axboe <axboe@kernel.dk>2019-03-07 18:59:26 +0300
commit9205e44916b2ca2e959be4210133292a19e79b0d (patch)
treecdb5ac5d9609ae0966601476460cdb97d5570db7 /drivers/lightnvm/pblk-rl.c
parent05b700ba6003fd98c41314f390df36e2b893e167 (diff)
downloadlinux-9205e44916b2ca2e959be4210133292a19e79b0d.tar.xz
pblk: fix max_io calculation
When calculating the maximun I/O size allowed into the buffer, consider the write size (ws_opt) used by the write thread in order to cover the case in which, due to flushes, the mem and subm pointers are disaligned by (ws_opt - 1). This case currently translates into a stall when an I/O of the largest possible size is submitted. Fixes: f9f9d1ae2c66 ("lightnvm: pblk: prevent stall due to wb threshold") Signed-off-by: Javier González <javier@javigon.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/lightnvm/pblk-rl.c')
-rw-r--r--drivers/lightnvm/pblk-rl.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/lightnvm/pblk-rl.c b/drivers/lightnvm/pblk-rl.c
index b014957dde0b..a5f8bc2defbc 100644
--- a/drivers/lightnvm/pblk-rl.c
+++ b/drivers/lightnvm/pblk-rl.c
@@ -233,10 +233,15 @@ void pblk_rl_init(struct pblk_rl *rl, int budget, int threshold)
/* To start with, all buffer is available to user I/O writers */
rl->rb_budget = budget;
rl->rb_user_max = budget;
- rl->rb_max_io = threshold ? (budget - threshold) : (budget - 1);
rl->rb_gc_max = 0;
rl->rb_state = PBLK_RL_HIGH;
+ /* Maximize I/O size and ansure that back threshold is respected */
+ if (threshold)
+ rl->rb_max_io = budget - pblk->min_write_pgs_data - threshold;
+ else
+ rl->rb_max_io = budget - pblk->min_write_pgs_data - 1;
+
atomic_set(&rl->rb_user_cnt, 0);
atomic_set(&rl->rb_gc_cnt, 0);
atomic_set(&rl->rb_space, -1);