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

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Message-ID: <CA+WzARkRYP=n1T+G3ciUYmM+nK3H-FpRMG5Nq8kpujTwpYmnMA@mail.gmail.com>
Date:   Mon, 23 Aug 2021 10:04:59 +0800
From:   zhenguo yao <yaozhenguo1@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     mike.kravetz@...cle.com, corbet@....net,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, yaozhenguo@...com,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] hugetlbfs: add hugepages_node kernel parameter

OK,  It's better to use a concise way to add this function.  I will
use a better way in the next version.

Andrew Morton <akpm@...ux-foundation.org> 于2021年8月23日周一 上午6:19写道：
>
> 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