linux-kernel - Re: [RFC PATCH 3/5] numa: introduce per-cgroup preferred numa node

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Message-ID: <20190423085533.GF11158@hirez.programming.kicks-ass.net>
Date:   Tue, 23 Apr 2019 10:55:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     王贇 <yun.wang@...ux.alibaba.com>
Cc:     hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [RFC PATCH 3/5] numa: introduce per-cgroup preferred numa node

On Mon, Apr 22, 2019 at 10:13:36AM +0800, 王贇 wrote:
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index af171ccb56a2..6513504373b4 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -2031,6 +2031,10 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
> 
>  	pol = get_vma_policy(vma, addr);
> 
> +	page = alloc_page_numa_preferred(gfp, order);
> +	if (page)
> +		goto out;
> +
>  	if (pol->mode == MPOL_INTERLEAVE) {
>  		unsigned nid;
> 

This I think is wrong, it overrides app specific mbind() requests.