linux-kernel - Re: [RFC PATCH v1 1/4] mm/damon: Generic context creation for modules

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Message-ID: <20260203011633.67532-1-sj@kernel.org>
Date: Mon,  2 Feb 2026 17:16:32 -0800
From: SeongJae Park <sj@...nel.org>
To: gutierrez.asier@...wei-partners.com
Cc: SeongJae Park <sj@...nel.org>,
	artem.kuzin@...wei.com,
	stepanov.anatoly@...wei.com,
	wangkefeng.wang@...wei.com,
	yanquanmin1@...wei.com,
	zuoze1@...wei.com,
	damon@...ts.linux.dev,
	akpm@...ux-foundation.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 1/4] mm/damon: Generic context creation for modules

Let's use 'mm/damon/modules-common:' as the commit subject prefix.

On Mon, 2 Feb 2026 14:56:46 +0000 <gutierrez.asier@...wei-partners.com> wrote:

> From: Asier Gutierrez <gutierrez.asier@...wei-partners.com>
> 
> Damon_modules_new_paddr_ctx_target. This works  only for physical contexts.

Let's be case-sensitive.  s/Damon_/damon_/ ?

> In case of virtual addresses, we should  duplicate the code.
> 
> It is more elegant to have a generic version of new context creation which
> receives the mode as a parameter.

Makes sense to me.

> 
> Signed-off-by: Asier Gutierrez <gutierrez.asier@...wei-partners.com>
> Co-developed-by: Anatoly Stepanov <stepanov.anatoly@...wei.com>
> ---
>  mm/damon/lru_sort.c       | 6 ++++--
>  mm/damon/modules-common.c | 7 ++++---
>  mm/damon/modules-common.h | 5 +++--
>  mm/damon/reclaim.c        | 5 +++--
>  4 files changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
> index 49b4bc294f4e..ac34b02dace8 100644
> --- a/mm/damon/lru_sort.c
> +++ b/mm/damon/lru_sort.c
> @@ -201,7 +201,8 @@ static int damon_lru_sort_apply_parameters(void)
>  	unsigned int hot_thres, cold_thres;
>  	int err;
>  
> -	err = damon_modules_new_paddr_ctx_target(&param_ctx, &param_target);
> +	err = damon_modules_new_ctx_target(&param_ctx, &param_target,
> +				DAMON_OPS_PADDR);
>  	if (err)
>  		return err;
>  
> @@ -375,7 +376,8 @@ static int __init damon_lru_sort_init(void)
>  		err = -ENOMEM;
>  		goto out;
>  	}
> -	err = damon_modules_new_paddr_ctx_target(&ctx, &target);
> +	err = damon_modules_new_ctx_target(&ctx, &target,
> +				DAMON_OPS_PADDR);

You could put the above line on the line before that without violating the 80
columns limit :)

>  	if (err)
>  		goto out;
>  
> diff --git a/mm/damon/modules-common.c b/mm/damon/modules-common.c
> index 86d58f8c4f63..5ba24e0ad9a1 100644
> --- a/mm/damon/modules-common.c
> +++ b/mm/damon/modules-common.c
> @@ -14,8 +14,9 @@
>   * @ctxp:	Pointer to save the point to the newly created context
>   * @targetp:	Pointer to save the point to the newly created target
>   */
> -int damon_modules_new_paddr_ctx_target(struct damon_ctx **ctxp,
> -		struct damon_target **targetp)
> +int damon_modules_new_ctx_target(struct damon_ctx **ctxp,
> +				struct damon_target **targetp,
> +				enum damon_ops_id mode)

You should also update the kernel-doc comments for the new parameter.

>  {
>  	struct damon_ctx *ctx;
>  	struct damon_target *target;
> @@ -24,7 +25,7 @@ int damon_modules_new_paddr_ctx_target(struct damon_ctx **ctxp,
>  	if (!ctx)
>  		return -ENOMEM;
>  
> -	if (damon_select_ops(ctx, DAMON_OPS_PADDR)) {
> +	if (damon_select_ops(ctx, mode)) {
>  		damon_destroy_ctx(ctx);
>  		return -EINVAL;
>  	}
> diff --git a/mm/damon/modules-common.h b/mm/damon/modules-common.h
> index f103ad556368..87d8058d7d85 100644
> --- a/mm/damon/modules-common.h
> +++ b/mm/damon/modules-common.h
> @@ -45,5 +45,6 @@
>  	module_param_named(nr_##qt_exceed_name, stat.qt_exceeds, ulong,	\
>  			0400);
>  
> -int damon_modules_new_paddr_ctx_target(struct damon_ctx **ctxp,
> -		struct damon_target **targetp);
> +int damon_modules_new_ctx_target(struct damon_ctx **ctxp,
> +				struct damon_target **targetp,
> +				enum damon_ops_id mode);
> diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
> index 36a582e09eae..b64fb810e096 100644
> --- a/mm/damon/reclaim.c
> +++ b/mm/damon/reclaim.c
> @@ -197,7 +197,8 @@ static int damon_reclaim_apply_parameters(void)
>  	struct damos_filter *filter;
>  	int err;
>  
> -	err = damon_modules_new_paddr_ctx_target(&param_ctx, &param_target);
> +	err = damon_modules_new_ctx_target(&param_ctx, &param_target,
> +				DAMON_OPS_PADDR);
>  	if (err)
>  		return err;
>  
> @@ -379,7 +380,7 @@ static int __init damon_reclaim_init(void)
>  		err = -ENOMEM;
>  		goto out;
>  	}
> -	err = damon_modules_new_paddr_ctx_target(&ctx, &target);
> +	err = damon_modules_new_ctx_target(&ctx, &target, DAMON_OPS_PADDR);
>  	if (err)
>  		goto out;
>  
> -- 
> 2.43.0

Overall, looks good for RFC.


Thanks,
SJ