linux-kernel - Re: [RFC PATCH v3 07/13] mm/damon/core: Commit damos->target_nid/migrate

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Message-Id: <20250702210323.55199-1-sj@kernel.org>
Date: Wed,  2 Jul 2025 14:03:23 -0700
From: SeongJae Park <sj@...nel.org>
To: Bijan Tabatabai <bijan311@...il.com>
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	akpm@...ux-foundation.org,
	corbet@....net,
	joshua.hahnjy@...il.com,
	bijantabatab@...ron.com,
	venkataravis@...ron.com,
	emirakhur@...ron.com,
	ajayjoshi@...ron.com,
	vtavarespetr@...ron.com
Subject: Re: [RFC PATCH v3 07/13] mm/damon/core: Commit damos->target_nid/migrate_dests

On Wed,  2 Jul 2025 15:13:30 -0500 Bijan Tabatabai <bijan311@...il.com> wrote:

> From: Bijan Tabatabai <bijantabatab@...ron.com>
> 
> When committing new scheme parameters from the sysfs, copy the
> target_nid and migrate_dests of the source schemes into the destination
> schemes.

Fixing the missed update of target_nid deserves Fixes: and Cc: stable@ in my
opinion.  Could you please split and post the part as another patch?  For the
Fixes, I think 83dc7bbaecae ("mm/damon/sysfs: use damon_commit_ctx()") should
be appripriate.

> 
> Signed-off-by: Bijan Tabatabai <bijantabatab@...ron.com>

Assuming my above request is accepted,

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

> ---
>  mm/damon/core.c | 40 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/mm/damon/core.c b/mm/damon/core.c
> index a4c3cfe531df..0565aae8d1fa 100644
> --- a/mm/damon/core.c
> +++ b/mm/damon/core.c
> @@ -943,6 +943,41 @@ static void damos_set_filters_default_reject(struct damos *s)
>  		damos_filters_default_reject(&s->ops_filters);
>  }
>  
> +static int damos_commit_dests(struct damos *dst, struct damos *src)
> +{
> +	struct damos_migrate_dests *dst_dests, *src_dests;
> +
> +	dst_dests = &dst->migrate_dests;
> +	src_dests = &src->migrate_dests;
> +
> +	if (dst_dests->nr_dests != src_dests->nr_dests) {
> +		kfree(dst_dests->node_id_arr);
> +		kfree(dst_dests->weight_arr);
> +
> +		dst_dests->node_id_arr = kmalloc_array(src_dests->nr_dests,
> +			sizeof(*dst_dests->node_id_arr), GFP_KERNEL);
> +		if (!dst_dests->node_id_arr) {
> +			dst_dests->weight_arr = NULL;
> +			return -ENOMEM;
> +		}
> +
> +		dst_dests->weight_arr = kmalloc_array(src_dests->nr_dests,
> +			sizeof(*dst_dests->weight_arr), GFP_KERNEL);
> +		if (!dst_dests->weight_arr) {
> +			/* ->node_id_arr will be freed by scheme destruction */
> +			return -ENOMEM;
> +		}
> +	}
> +
> +	dst_dests->nr_dests = src_dests->nr_dests;
> +	for (int i = 0; i < src_dests->nr_dests; i++) {
> +		dst_dests->node_id_arr[i] = src_dests->node_id_arr[i];
> +		dst_dests->weight_arr[i] = src_dests->weight_arr[i];
> +	}
> +
> +	return 0;
> +}
> +
>  static int damos_commit_filters(struct damos *dst, struct damos *src)
>  {
>  	int err;
> @@ -983,6 +1018,11 @@ static int damos_commit(struct damos *dst, struct damos *src)
>  
>  	dst->wmarks = src->wmarks;
>  
> +	dst->target_nid = src->target_nid;
> +	err = damos_commit_dests(dst, src);
> +	if (err)
> +		return err;
> +

As mentioned above, let's split and post this part as another individual patch.

>  	err = damos_commit_filters(dst, src);
>  	return err;
>  }
> -- 
> 2.43.5


Thanks,
SJ