[PATCH] lightnvm: do not assume sequential lun alloc.

[PATCH] lightnvm: do not assume sequential lun alloc.

[Javier González]

When doing GC, rrpc calculates the physical LUN to which the rrpc block
belongs too. This calculation is based on the assumption that LUNs are
assigned sequentially to the LUN list. Use the reference to the LUN
instead. This saves us the calculation and allows us to align LUNs in a
different manner to, for example, take advantage of devide parallelism.

Signed-off-by: Javier González <javier@cnexlabs.com>
---
 drivers/lightnvm/rrpc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index ffcfee6..48862ead 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -405,9 +405,8 @@ static void rrpc_block_gc(struct work_struct *work)
 									ws_gc);
 	struct rrpc *rrpc = gcb->rrpc;
 	struct rrpc_block *rblk = gcb->rblk;
+	struct rrpc_lun *rlun = rblk->rlun;
 	struct nvm_dev *dev = rrpc->dev;
-	struct nvm_lun *lun = rblk->parent->lun;
-	struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
 
 	mempool_free(gcb, rrpc->gcb_pool);
 	pr_debug("nvm: block '%lu' being reclaimed\n", rblk->parent->id);
@@ -508,9 +507,9 @@ static void rrpc_gc_queue(struct work_struct *work)
 									ws_gc);
 	struct rrpc *rrpc = gcb->rrpc;
 	struct rrpc_block *rblk = gcb->rblk;
+	struct rrpc_lun *rlun = rblk->rlun;
 	struct nvm_lun *lun = rblk->parent->lun;
 	struct nvm_block *blk = rblk->parent;
-	struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
 
 	spin_lock(&rlun->lock);
 	list_add_tail(&rblk->prio, &rlun->prio_list);
-- 
2.5.0

Re: [PATCH] lightnvm: do not assume sequential lun alloc.

[Matias Bjørling]

On 04/29/2016 04:46 PM, Javier González wrote:
> When doing GC, rrpc calculates the physical LUN to which the rrpc block
> belongs too. This calculation is based on the assumption that LUNs are
> assigned sequentially to the LUN list. Use the reference to the LUN
> instead. This saves us the calculation and allows us to align LUNs in a
> different manner to, for example, take advantage of devide parallelism.
>
> Signed-off-by: Javier González <javier@cnexlabs.com>
> ---
>   drivers/lightnvm/rrpc.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index ffcfee6..48862ead 100644
> --- a/drivers/lightnvm/rrpc.c
> +++ b/drivers/lightnvm/rrpc.c
> @@ -405,9 +405,8 @@ static void rrpc_block_gc(struct work_struct *work)
>   									ws_gc);
>   	struct rrpc *rrpc = gcb->rrpc;
>   	struct rrpc_block *rblk = gcb->rblk;
> +	struct rrpc_lun *rlun = rblk->rlun;
>   	struct nvm_dev *dev = rrpc->dev;
> -	struct nvm_lun *lun = rblk->parent->lun;
> -	struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
>
>   	mempool_free(gcb, rrpc->gcb_pool);
>   	pr_debug("nvm: block '%lu' being reclaimed\n", rblk->parent->id);
> @@ -508,9 +507,9 @@ static void rrpc_gc_queue(struct work_struct *work)
>   									ws_gc);
>   	struct rrpc *rrpc = gcb->rrpc;
>   	struct rrpc_block *rblk = gcb->rblk;
> +	struct rrpc_lun *rlun = rblk->rlun;
>   	struct nvm_lun *lun = rblk->parent->lun;
>   	struct nvm_block *blk = rblk->parent;
> -	struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
>
>   	spin_lock(&rlun->lock);
>   	list_add_tail(&rblk->prio, &rlun->prio_list);
>

Thanks Javier. Applied for 4.7.