linux-kernel - Re: [PATCH] mm/damon: rename damon_pageout_score() to damon_cold

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Date:   Sat, 17 Sep 2022 11:12:29 +0000
From:   SeongJae Park <sj@...nel.org>
To:     xiakaixu1987@...il.com
Cc:     sj@...nel.org, akpm@...ux-foundation.org, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Kaixu Xia <kaixuxia@...cent.com>
Subject: Re: [PATCH] mm/damon: rename damon_pageout_score() to damon_cold_score()

On Sat, 17 Sep 2022 17:39:18 +0800 xiakaixu1987@...il.com wrote:

> From: Kaixu Xia <kaixuxia@...cent.com>
> 
> In the beginning there is only one damos_action 'DAMOS_PAGEOUT'
> that need to get the coldness score of a region for a scheme,
> which using damon_pageout_score() to do that. But now there are
> also other damos_action actions need the coldness score, so
> rename it to damon_cold_score() to make more sense.

Good idea.

> 
> Signed-off-by: Kaixu Xia <kaixuxia@...cent.com>
> ---
>  mm/damon/ops-common.c | 2 +-
>  mm/damon/ops-common.h | 2 +-
>  mm/damon/paddr.c      | 5 ++---
>  mm/damon/vaddr.c      | 2 +-
>  4 files changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
> index 9310df72e1c5..75409601f934 100644
> --- a/mm/damon/ops-common.c
> +++ b/mm/damon/ops-common.c
> @@ -130,7 +130,7 @@ int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
>  	return hotness;
>  }
>  
> -int damon_pageout_score(struct damon_ctx *c, struct damon_region *r,
> +int damon_cold_score(struct damon_ctx *c, struct damon_region *r,
>  			struct damos *s)
>  {
>  	int hotness = damon_hot_score(c, r, s);
> diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h
> index 52329ff361cd..8d82d3722204 100644
> --- a/mm/damon/ops-common.h
> +++ b/mm/damon/ops-common.h
> @@ -12,7 +12,7 @@ struct page *damon_get_page(unsigned long pfn);
>  void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm, unsigned long addr);
>  void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr);
>  
> -int damon_pageout_score(struct damon_ctx *c, struct damon_region *r,
> +int damon_cold_score(struct damon_ctx *c, struct damon_region *r,
>  			struct damos *s);
>  int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
>  			struct damos *s);
> diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
> index dfeebffe82f4..e495146e49e9 100644
> --- a/mm/damon/paddr.c
> +++ b/mm/damon/paddr.c
> @@ -287,11 +287,10 @@ static int damon_pa_scheme_score(struct damon_ctx *context,
>  {
>  	switch (scheme->action) {
>  	case DAMOS_PAGEOUT:
> -		return damon_pageout_score(context, r, scheme);
> +	case DAMOS_LRU_DEPRIO:
> +		return damon_cold_score(context, r, scheme);
>  	case DAMOS_LRU_PRIO:
>  		return damon_hot_score(context, r, scheme);
> -	case DAMOS_LRU_DEPRIO:
> -		return damon_pageout_score(context, r, scheme);

I'm not a big fan of switch-case fall-through, and want to keep the order of
cases here more similar to that in damos_action definition.  Let's change only 
the function name.

Other than that,

Reviewed-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

>  	default:
>  		break;
>  	}
> diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
> index f53c2ff2bcc8..ea94e0b2c311 100644
> --- a/mm/damon/vaddr.c
> +++ b/mm/damon/vaddr.c
> @@ -673,7 +673,7 @@ static int damon_va_scheme_score(struct damon_ctx *context,
>  
>  	switch (scheme->action) {
>  	case DAMOS_PAGEOUT:
> -		return damon_pageout_score(context, r, scheme);
> +		return damon_cold_score(context, r, scheme);
>  	default:
>  		break;
>  	}
> -- 
> 2.27.0
> 
>