linux-kernel - Re: [RFC PATCH v2 1/2] mm/mempolicy: Expose get_il

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Message-ID: <875xglo18n.fsf@DESKTOP-5N7EMDA>
Date: Tue, 24 Jun 2025 18:58:00 +0800
From: "Huang, Ying" <ying.huang@...ux.alibaba.com>
To: Bijan Tabatabai <bijan311@...il.com>
Cc: damon@...ts.linux.dev,  linux-mm@...ck.org,
  linux-kernel@...r.kernel.org,  sj@...nel.org,  akpm@...ux-foundation.org,
  david@...hat.com,  ziy@...dia.com,  matthew.brost@...el.com,
  joshua.hahnjy@...il.com,  rakie.kim@...com,  byungchul@...com,
  gourry@...rry.net,  apopple@...dia.com,  bijantabatab@...ron.com,
  venkataravis@...ron.com,  emirakhur@...ron.com,  ajayjoshi@...ron.com,
  vtavarespetr@...ron.com
Subject: Re: [RFC PATCH v2 1/2] mm/mempolicy: Expose get_il_weight() to MM

Bijan Tabatabai <bijan311@...il.com> writes:

> From: Bijan Tabatabai <bijantabatab@...ron.com>
>
> This patch exposes get_il_weight() in mm/internal.h. This patch is to
> allow other parts of the MM subsystem, such as DAMON, to make page
> placement decisions based on the global interleave weights.
>
> Signed-off-by: Bijan Tabatabai <bijantabatab@...ron.com>
> ---
>  mm/internal.h  | 6 ++++++
>  mm/mempolicy.c | 2 +-
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/mm/internal.h b/mm/internal.h
> index 3823fb356d3b..b718ebe7cad5 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -1169,6 +1169,7 @@ extern int node_reclaim_mode;
>  
>  extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
>  extern int find_next_best_node(int node, nodemask_t *used_node_mask);
> +extern u8 get_il_weight(int node);
>  #else
>  #define node_reclaim_mode 0
>  
> @@ -1181,6 +1182,11 @@ static inline int find_next_best_node(int node, nodemask_t *used_node_mask)
>  {
>  	return NUMA_NO_NODE;
>  }
> +
> +static inline u8 get_il_weight(int node)
> +{
> +	return 1;
> +}
>  #endif
>  
>  static inline bool node_reclaim_enabled(void)
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index 1ff7b2174eb7..b1713430ee9c 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -165,7 +165,7 @@ static unsigned int *node_bw_table;
>   */
>  static DEFINE_MUTEX(wi_state_lock);
>  
> -static u8 get_il_weight(int node)
> +u8 get_il_weight(int node)
>  {
>  	struct weighted_interleave_state *state;
>  	u8 weight = 1;

I agree with David on the function naming and "extern".  Otherwise, this
looks good to me, Thanks!  Feel free to add my

Reviewed-by: Huang Ying <ying.huang@...ux.alibaba.com>

in the future versions.

---
Best Regards,
Huang, Ying