linux-kernel - Re: [PATCH v1 1/2] mm/damon: Move invalid folio and has filter to ops-common

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Message-Id: <20250729182001.56172-1-sj@kernel.org>
Date: Tue, 29 Jul 2025 11:20:01 -0700
From: SeongJae Park <sj@...nel.org>
To: Yueyang Pan <pyyjason@...il.com>
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Usama Arif <usamaarif642@...il.com>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] mm/damon: Move invalid folio and has filter to ops-common

On Tue, 29 Jul 2025 06:53:29 -0700 Yueyang Pan <pyyjason@...il.com> wrote:

> From: PanJason <pyyjason@...il.com>
> 
> This patch moves the damon_pa_invalid_damos_folio and
> damon_pa_scheme_has_filter to ops-common. renaming them
> to damon_invalid_damos_folio and damon_scheme_has_filter.
> Doing so allows us to reuse their logic in the vaddr version
> of DAMOS_STAT

You forgot adding your Signed-off-by:

> ---
>  mm/damon/ops-common.c | 19 +++++++++++++++++++
>  mm/damon/ops-common.h |  3 +++
>  mm/damon/paddr.c      | 29 +++++------------------------
>  3 files changed, 27 insertions(+), 24 deletions(-)
> 
> diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
> index 99321ff5cb92..7d3b48cc0f86 100644
> --- a/mm/damon/ops-common.c
> +++ b/mm/damon/ops-common.c
> @@ -412,3 +412,22 @@ unsigned long damon_migrate_pages(struct list_head *folio_list, int target_nid)
>  
>  	return nr_migrated;
>  }
> +
> +bool damon_scheme_has_filter(struct damos *s)
> +{
> +	struct damos_filter *f;
> +	damos_for_each_ops_filter(f, s)
> +		return true;
> +	return false;
> +}
> +
> +bool damon_invalid_damos_folio(struct folio *folio, struct damos *s)
> +{
> +	if (!folio)
> +		return true;
> +	if (folio == s->last_applied) {
> +		folio_put(folio);
> +		return true;
> +	}
> +	return false;
> +}

Unless you have different opinions about this function I mentioned on the reply
to the next patch, let's not move this function.

> diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h
> index 61ad54aaf256..4e905477fdce 100644
> --- a/mm/damon/ops-common.h
> +++ b/mm/damon/ops-common.h
> @@ -21,3 +21,6 @@ int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
>  
>  bool damos_folio_filter_match(struct damos_filter *filter, struct folio *folio);
>  unsigned long damon_migrate_pages(struct list_head *folio_list, int target_nid);
> +
> +bool damon_scheme_has_filter(struct damos *s);
> +bool damon_invalid_damos_folio(struct folio *folio, struct damos *s);
> diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
> index 53a55c5114fb..a8b7048e871e 100644
> --- a/mm/damon/paddr.c
> +++ b/mm/damon/paddr.c
> @@ -114,16 +114,6 @@ static bool damos_pa_filter_out(struct damos *scheme, struct folio *folio)
>  	return scheme->ops_filters_default_reject;
>  }
>  
> -static bool damon_pa_invalid_damos_folio(struct folio *folio, struct damos *s)
> -{
> -	if (!folio)
> -		return true;
> -	if (folio == s->last_applied) {
> -		folio_put(folio);
> -		return true;
> -	}
> -	return false;
> -}
>  
>  static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s,
>  		unsigned long *sz_filter_passed)
> @@ -152,7 +142,7 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s,
>  	addr = r->ar.start;
>  	while (addr < r->ar.end) {
>  		folio = damon_get_folio(PHYS_PFN(addr));
> -		if (damon_pa_invalid_damos_folio(folio, s)) {
> +		if (damon_invalid_damos_folio(folio, s)) {
>  			addr += PAGE_SIZE;
>  			continue;
>  		}
> @@ -192,7 +182,7 @@ static inline unsigned long damon_pa_mark_accessed_or_deactivate(
>  	addr = r->ar.start;
>  	while (addr < r->ar.end) {
>  		folio = damon_get_folio(PHYS_PFN(addr));
> -		if (damon_pa_invalid_damos_folio(folio, s)) {
> +		if (damon_invalid_damos_folio(folio, s)) {
>  			addr += PAGE_SIZE;
>  			continue;
>  		}
> @@ -239,7 +229,7 @@ static unsigned long damon_pa_migrate(struct damon_region *r, struct damos *s,
>  	addr = r->ar.start;
>  	while (addr < r->ar.end) {
>  		folio = damon_get_folio(PHYS_PFN(addr));
> -		if (damon_pa_invalid_damos_folio(folio, s)) {
> +		if (damon_invalid_damos_folio(folio, s)) {
>  			addr += PAGE_SIZE;
>  			continue;
>  		}
> @@ -262,28 +252,19 @@ static unsigned long damon_pa_migrate(struct damon_region *r, struct damos *s,
>  	return applied * PAGE_SIZE;
>  }
>  
> -static bool damon_pa_scheme_has_filter(struct damos *s)
> -{
> -	struct damos_filter *f;
> -
> -	damos_for_each_ops_filter(f, s)
> -		return true;
> -	return false;
> -}
> -
>  static unsigned long damon_pa_stat(struct damon_region *r, struct damos *s,
>  		unsigned long *sz_filter_passed)
>  {
>  	unsigned long addr;
>  	struct folio *folio;
>  
> -	if (!damon_pa_scheme_has_filter(s))
> +	if (!damon_scheme_has_filter(s))
>  		return 0;
>  
>  	addr = r->ar.start;
>  	while (addr < r->ar.end) {
>  		folio = damon_get_folio(PHYS_PFN(addr));
> -		if (damon_pa_invalid_damos_folio(folio, s)) {
> +		if (damon_invalid_damos_folio(folio, s)) {
>  			addr += PAGE_SIZE;
>  			continue;
>  		}
> -- 
> 2.47.3

Other than above, looks good to me.


Thanks,
SJ