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From:   zhenguo yao <yaozhenguo1@gmail.com>
Date:   Mon, 23 Aug 2021 10:04:59 +0800
Message-ID: <CA+WzARkRYP=n1T+G3ciUYmM+nK3H-FpRMG5Nq8kpujTwpYmnMA@mail.gmail.com>
Subject: Re: [PATCH] hugetlbfs: add hugepages_node kernel parameter
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     mike.kravetz@oracle.com, corbet@lwn.net,
        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-mm@kvack.org, yaozhenguo@jd.com,
        Matthew Wilcox <willy@infradead.org>
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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@linux-foundation.org> =E4=BA=8E2021=E5=B9=B48=E6=9C=882=
3=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8A=E5=8D=886:19=E5=86=99=E9=81=93=EF=BC=
=9A
>
> On Fri, 20 Aug 2021 11:05:36 +0800 yaozhenguo <yaozhenguo1@gmail.com> wro=
te:
>
> > 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 wi=
ll
> > be an impossible task. So, add hugepages_node kernel parameter to speci=
fy
> > node number of hugepages to allocate at boot.
> > For example add following parameter:
> >
> > hugepagesz=3D1G hugepages_node=3D1 hugepages=3D4
> >
> > 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=3D1,2,5