linux-kernel - Re: [PATCH v2 1/2] mm/damon: Move has filter to ops-common

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Message-Id: <20250730174506.60001-1-sj@kernel.org>
Date: Wed, 30 Jul 2025 10:45:06 -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 v2 1/2] mm/damon: Move has filter to ops-common

On Wed, 30 Jul 2025 10:19:55 -0700 Yueyang Pan <pyyjason@...il.com> wrote:

> This patch moves damon_pa_scheme_has_filter to ops-common. renaming
> to damon_scheme_has_filter.
> Doing so allows us to reuse its logic in the vaddr version
> of DAMOS_STAT
> 
> Signed-off-by: Yueyang Pan <pyyjason@...il.com>
> ---
>  mm/damon/ops-common.c |  9 +++++++++
>  mm/damon/ops-common.h |  2 ++
>  mm/damon/paddr.c      | 11 +----------
>  3 files changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
> index 99321ff5cb92..3ebfa356ca46 100644
> --- a/mm/damon/ops-common.c
> +++ b/mm/damon/ops-common.c
> @@ -412,3 +412,12 @@ 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;
> +}

I should have tell this earlier, sorry.  I now think it would be good to have
ops-common.c own prefix, since this namee makes me expect the function is on
DAMON core layer.  Also, I use normal 'grep' and ctags at the best, and maybe
I'm not the only one that that lazy at learning new tools.

Following the weird and none-public naming convention we have on DAMON,
damos_ops_ for DAMOS-related functions and damon_ops_ for monitoring-related
functions would be the prefix for ops-common.c.

So, what about renaming this to damos_ops_has_filter() if we have a chance to
revision this once again?

> diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h
> index 61ad54aaf256..8d5c5c7631ac 100644
> --- a/mm/damon/ops-common.h
> +++ b/mm/damon/ops-common.h
> @@ -21,3 +21,5 @@ 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);
> diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
> index 53a55c5114fb..daeceed981a0 100644
> --- a/mm/damon/paddr.c
> +++ b/mm/damon/paddr.c
> @@ -262,22 +262,13 @@ 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;
> -- 
> 2.47.3

Otherwise, all looks good to me.


Thanks,
SJ