linux-kernel - Re: [PATCH 2/6] mm/vmscan: use node_is_toptier helper in node

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Date:   Tue, 31 May 2022 17:20:42 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Davidlohr Bueso <dave@...olabs.net>, linux-mm@...ck.org,
        Wei Xu <weixugc@...gle.com>, Huang Ying <ying.huang@...el.com>
Cc:     mhocko@...nel.org, akpm@...ux-foundation.org, rientjes@...gle.com,
        yosryahmed@...gle.com, hannes@...xchg.org, shakeelb@...gle.com,
        dave.hansen@...ux.intel.com, tim.c.chen@...ux.intel.com,
        roman.gushchin@...ux.dev, gthelen@...gle.com,
        a.manzanares@...sung.com, heekwon.p@...sung.com,
        gim.jongmin@...sung.com, dave@...olabs.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] mm/vmscan: use node_is_toptier helper in node_reclaim

Davidlohr Bueso <dave@...olabs.net> writes:

> We have helpers for a reason.
>
> Signed-off-by: Davidlohr Bueso <dave@...olabs.net>
> ---
>  mm/vmscan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 1678802e03e7..cb583fcbf5bf 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -4750,7 +4750,7 @@ int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
>  	 * over remote processors and spread off node memory allocations
>  	 * as wide as possible.
>  	 */
> -	if (node_state(pgdat->node_id, N_CPU) && pgdat->node_id != numa_node_id())
> +	if (node_is_toptier(pgdat->node_id) && pgdat->node_id != numa_node_id())
>  		return NODE_RECLAIM_NOSCAN;
>  
>  	if (test_and_set_bit(PGDAT_RECLAIM_LOCKED, &pgdat->flags))


Are we really looking at the top tier in a tiered memory hierarchy here?
The comment seems to suggest we are looking at local NUMA node?


-aneesh