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

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Message-ID: <57270E51.1060809@lightnvm.io>
Date:	Mon, 2 May 2016 10:22:41 +0200
From:	Matias Bjørling <mb@...htnvm.io>
To:	Javier González <jg@...htnvm.io>
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Javier González <javier@...xlabs.com>
Subject: Re: [PATCH] lightnvm: do not assume sequential lun alloc.

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@...xlabs.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.