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

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Message-ID: <38d2f33e-03c1-4b33-8e0e-1a38ebbf3305@huawei-partners.com>
Date: Tue, 3 Feb 2026 16:04:19 +0300
From: Gutierrez Asier <gutierrez.asier@...wei-partners.com>
To: SeongJae Park <sj@...nel.org>
CC: <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



On 2/3/2026 4:16 AM, SeongJae Park wrote:
> 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_/ ?

OK, will do it.

> 
>> 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 :)

Sure, will correct it.

> 
>>  	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
> 

-- 
Asier Gutierrez
Huawei