On Wed, 2 Jul 2025 15:13:30 -0500 Bijan Tabatabai <bijan311@gmail.com> wrote:
> From: Bijan Tabatabai <bijantabatab@micron.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@micron.com>
Assuming my above request is accepted,
Reviewed-by: SeongJae Park <sj@kernel.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