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From: Michal Hocko <mhocko@kernel.org>
To: linux-mm@kvack.org
Cc: Mike Kravetz <mike.kravetz@oracle.com>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFC 2/2] mm, hugetlb: do not rely on overcommit limit during migration
Date: Wed, 29 Nov 2017 12:23:22 +0100	[thread overview]
Message-ID: <20171129112322.ix3b4byfx2a3aktd@dhcp22.suse.cz> (raw)
In-Reply-To: <20171129092234.eluli2gl7gotj35x@dhcp22.suse.cz>

On Wed 29-11-17 10:22:34, Michal Hocko wrote:
> What about this on top. I haven't tested this yet though.

OK, it seem to work:
root@test1:~# echo 1 > /proc/sys/vm/nr_hugepages
root@test1:~# echo 1 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_overcommit_hugepages

root@test1:~# grep . /sys/devices/system/node/node*/hugepages/hugepages-2048kB/*
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:0
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:0
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:1
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:1
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:0

# mmap 2 huge pages

root@test1:~# grep . /sys/devices/system/node/node*/hugepages/hugepages-2048kB/*
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:0
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:0
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:2
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:1

root@test1:~# migratepages $(pidof map_hugetlb) 1 0

/sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:0
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:2
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:1
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:0

and exit the mmap

root@test1:~# grep . /sys/devices/system/node/node*/hugepages/hugepages-2048kB/*
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/free_hugepages:1
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages:1
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/surplus_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/free_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages:0
/sys/devices/system/node/node1/hugepages/hugepages-2048kB/surplus_hugepages:0
-- 
Michal Hocko
SUSE Labs

  parent reply	other threads:[~2017-11-29 11:23 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-22 15:28 hugetlb page migration vs. overcommit Michal Hocko
2017-11-22 19:11 ` Mike Kravetz
2017-11-23  9:21   ` Michal Hocko
2017-11-27  6:27   ` Naoya Horiguchi
2017-11-28 10:19 ` Michal Hocko
2017-11-28 14:12   ` Michal Hocko
2017-11-28 14:12     ` [PATCH RFC 1/2] mm, hugetlb: unify core page allocation accounting and initialization Michal Hocko
2017-11-28 21:34       ` Mike Kravetz
2017-11-29  6:57         ` Michal Hocko
2017-11-29 19:09           ` Mike Kravetz
2017-11-28 14:12     ` [PATCH RFC 2/2] mm, hugetlb: do not rely on overcommit limit during migration Michal Hocko
2017-11-29  1:39       ` Mike Kravetz
2017-11-29  7:17         ` Michal Hocko
2017-11-29  9:22       ` Michal Hocko
2017-11-29  9:40         ` Michal Hocko
2017-11-29 11:23         ` Michal Hocko [this message]
2017-11-29 19:52         ` Mike Kravetz
2017-11-30  7:57           ` Michal Hocko
2017-11-30 19:35             ` Mike Kravetz
2017-11-30 19:57               ` Michal Hocko
2017-11-30 20:06                 ` Michal Hocko
2017-11-29  9:51       ` Michal Hocko
2017-11-29 11:33       ` [PATCH RFC v2 " Michal Hocko

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