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Date: Mon, 25 Sep 2017 12:24:12 +0200
From: Matias Bjørling <mb@...htnvm.io>
To: Javier González <jg@...htnvm.io>,
Rakesh Pandit <rakesh@...era.com>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] lightnvm: pblk: reuse pblk_gc_should_kick
On 09/22/2017 10:40 AM, Javier González wrote:
>> On 21 Sep 2017, at 13.25, Rakesh Pandit <rakesh@...era.com> wrote:
>>
>> This is a trivial change which reuses pblk_gc_should_kick instead of
>> repeating it again in pblk_rl_free_lines_inc.
>>
>> Signed-off-by: Rakesh Pandit <rakesh@...era.com>
>> ---
>> drivers/lightnvm/pblk-core.c | 1 +
>> drivers/lightnvm/pblk-rl.c | 9 ---------
>> 2 files changed, 1 insertion(+), 9 deletions(-)
>>
>> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
>> index 64a6a25..a230125 100644
>> --- a/drivers/lightnvm/pblk-core.c
>> +++ b/drivers/lightnvm/pblk-core.c
>> @@ -1478,6 +1478,7 @@ static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
>> spin_unlock(&l_mg->free_lock);
>>
>> pblk_rl_free_lines_inc(&pblk->rl, line);
>> + pblk_gc_should_kick(pblk);
>> }
>>
>> static void pblk_line_put_ws(struct work_struct *work)
>> diff --git a/drivers/lightnvm/pblk-rl.c b/drivers/lightnvm/pblk-rl.c
>> index 596bdec..e7c162a 100644
>> --- a/drivers/lightnvm/pblk-rl.c
>> +++ b/drivers/lightnvm/pblk-rl.c
>> @@ -129,18 +129,9 @@ static int pblk_rl_update_rates(struct pblk_rl *rl, unsigned long max)
>>
>> void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line)
>> {
>> - struct pblk *pblk = container_of(rl, struct pblk, rl);
>> int blk_in_line = atomic_read(&line->blk_in_line);
>> - int ret;
>>
>> atomic_add(blk_in_line, &rl->free_blocks);
>> - /* Rates will not change that often - no need to lock update */
>> - ret = pblk_rl_update_rates(rl, rl->rb_budget);
>> -
>> - if (ret == (PBLK_RL_MID | PBLK_RL_LOW))
>> - pblk_gc_should_start(pblk);
>> - else
>> - pblk_gc_should_stop(pblk);
>> }
>>
>> void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line)
>> --
>> 2.5.0
>
> Looking at the patch, I can see that a more general cleanup can be done.
> What do you think about this? We can merge it in this patch if you are OK
> with it.
>
> From 944936663c7eef7bc32243b89cc554e40ec436c5 Mon Sep 17 00:00:00 2001
> From: Rakesh Pandit <rakesh@...era.com>
> Date: Thu, 21 Sep 2017 14:25:40 +0300
> Subject: [PATCH] lightnvm: pblk: reuse pblk_gc_should_kick
>
> This is a trivial change which reuses pblk_gc_should_kick instead of
> repeating it again in pblk_rl_free_lines_inc.
>
> Signed-off-by: Rakesh Pandit <rakesh@...era.com>
> ---
> drivers/lightnvm/pblk-core.c | 2 --
> drivers/lightnvm/pblk-rl.c | 33 +++++++++------------------------
> drivers/lightnvm/pblk.h | 1 -
> 3 files changed, 9 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> index 64a6a255514e..c92113b0a2e7 100644
> --- a/drivers/lightnvm/pblk-core.c
> +++ b/drivers/lightnvm/pblk-core.c
> @@ -1633,8 +1633,6 @@ void pblk_line_close(struct pblk *pblk, struct pblk_line *line)
>
> spin_unlock(&line->lock);
> spin_unlock(&l_mg->gc_lock);
> -
> - pblk_gc_should_kick(pblk);
> }
>
> void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
> diff --git a/drivers/lightnvm/pblk-rl.c b/drivers/lightnvm/pblk-rl.c
> index 596bdec433c3..0896439a91b0 100644
> --- a/drivers/lightnvm/pblk-rl.c
> +++ b/drivers/lightnvm/pblk-rl.c
> @@ -96,9 +96,11 @@ unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl)
> *
> * Only the total number of free blocks is used to configure the rate limiter.
> */
> -static int pblk_rl_update_rates(struct pblk_rl *rl, unsigned long max)
> +static void pblk_rl_update_rates(struct pblk_rl *rl)
> {
> + struct pblk *pblk = container_of(rl, struct pblk, rl);
> unsigned long free_blocks = pblk_rl_nr_free_blks(rl);
> + int max = rl->rb_budget;
>
> if (free_blocks >= rl->high) {
> rl->rb_user_max = max;
> @@ -124,23 +126,18 @@ static int pblk_rl_update_rates(struct pblk_rl *rl, unsigned long max)
> rl->rb_state = PBLK_RL_LOW;
> }
>
> - return rl->rb_state;
> + if (rl->rb_state == (PBLK_RL_MID | PBLK_RL_LOW))
> + pblk_gc_should_start(pblk);
> + else
> + pblk_gc_should_stop(pblk);
> }
>
> void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line)
> {
> - struct pblk *pblk = container_of(rl, struct pblk, rl);
> int blk_in_line = atomic_read(&line->blk_in_line);
> - int ret;
>
> atomic_add(blk_in_line, &rl->free_blocks);
> - /* Rates will not change that often - no need to lock update */
> - ret = pblk_rl_update_rates(rl, rl->rb_budget);
> -
> - if (ret == (PBLK_RL_MID | PBLK_RL_LOW))
> - pblk_gc_should_start(pblk);
> - else
> - pblk_gc_should_stop(pblk);
> + pblk_rl_update_rates(rl);
> }
>
> void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line)
> @@ -148,19 +145,7 @@ void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line)
> int blk_in_line = atomic_read(&line->blk_in_line);
>
> atomic_sub(blk_in_line, &rl->free_blocks);
> -}
> -
> -void pblk_gc_should_kick(struct pblk *pblk)
> -{
> - struct pblk_rl *rl = &pblk->rl;
> - int ret;
> -
> - /* Rates will not change that often - no need to lock update */
> - ret = pblk_rl_update_rates(rl, rl->rb_budget);
> - if (ret == (PBLK_RL_MID | PBLK_RL_LOW))
> - pblk_gc_should_start(pblk);
> - else
> - pblk_gc_should_stop(pblk);
> + pblk_rl_update_rates(rl);
> }
>
> int pblk_rl_high_thrs(struct pblk_rl *rl)
> diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
> index eaf539715d71..d4b7dee0ef50 100644
> --- a/drivers/lightnvm/pblk.h
> +++ b/drivers/lightnvm/pblk.h
> @@ -829,7 +829,6 @@ int pblk_gc_init(struct pblk *pblk);
> void pblk_gc_exit(struct pblk *pblk);
> void pblk_gc_should_start(struct pblk *pblk);
> void pblk_gc_should_stop(struct pblk *pblk);
> -void pblk_gc_should_kick(struct pblk *pblk);
> void pblk_gc_kick(struct pblk *pblk);
> void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled,
> int *gc_active);
> --
> 2.7.4
>
Thanks, I applied the common version.
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