linux-kernel - Re: [PATCH] hugetlbfs: add hugepages

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Message-Id: <20210822151952.23ca9547316dc34c9f3bd482@linux-foundation.org>
Date:   Sun, 22 Aug 2021 15:19:52 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     yaozhenguo <yaozhenguo1@...il.com>
Cc:     mike.kravetz@...cle.com, corbet@....net, yaozhenguo@...com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH] hugetlbfs: add hugepages_node kernel parameter

On Fri, 20 Aug 2021 11:05:36 +0800 yaozhenguo <yaozhenguo1@...il.com> wrote:

> We can specify the number of hugepages to allocate at boot. But the
> hugepages is balanced in all nodes at present. In some scenarios,
> we only need hugepags in one node. For example: DPDK needs hugepages
> which is in the same node as NIC. if DPDK needs four hugepags of 1G
> size in node1 and system has 16 numa nodes. We must reserve 64 hugepags
> in kernel cmdline. But, only four hugepages is used. The others should
> be free after boot.If the system memory is low(for example: 64G), it will
> be an impossible task. So, add hugepages_node kernel parameter to specify
> node number of hugepages to allocate at boot.
> For example add following parameter:
> 
> hugepagesz=1G hugepages_node=1 hugepages=4
> 
> It will allocate 4 hugepags in node1 at boot.

If were going to do this, shouldn't we permit more than one node?

	hugepages_nodes=1,2,5