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Date: Fri, 22 Sep 2017 12:04:57 +0200
From: Javier González <jg@...htnvm.io>
To: Rakesh Pandit <rakesh@...era.com>
Cc: Matias Bjørling <mb@...htnvm.io>,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] lightnvm: pblk: reuse pblk_gc_should_kick
> On 22 Sep 2017, at 11.42, Rakesh Pandit <rakesh@...era.com> wrote:
>
> On Fri, Sep 22, 2017 at 10:40:57AM +0200, Javier González wrote:
>>> On 21 Sep 2017, at 13.25, Rakesh Pandit 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.
>
> Makes more sense. Feel free to merge. You have my Signed-off-by tag.
We'll merge it with your patch, which was the original cleanup.
Matias: can you pick the code in the patch below instead?
>
>> 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
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