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Message-Id: <20220412214238.84c20437a052458f6967e9fd@linux-foundation.org>
Date: Tue, 12 Apr 2022 21:42:38 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Peng Liu <liupeng256@...wei.com>
Cc: <mike.kravetz@...cle.com>, <david@...hat.com>,
<yaozhenguo1@...il.com>, <baolin.wang@...ux.alibaba.com>,
<songmuchun@...edance.com>, <liuyuntao10@...wei.com>,
<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] hugetlb: Fix wrong use of nr_online_nodes
On Wed, 13 Apr 2022 03:29:12 +0000 Peng Liu <liupeng256@...wei.com> wrote:
> Certain systems are designed to have sparse/discontiguous nodes. In
> this case, nr_online_nodes can not be used to walk through numa node.
> Also, a valid node may be greater than nr_online_nodes.
>
> However, in hugetlb, it is assumed that nodes are contiguous. Recheck
> all the places that use nr_online_nodes, and repair them one by one.
>
What are the runtime effects of this shortcoming?
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