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Date: Thu, 23 Nov 2017 10:21:49 +0100
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: hugetlb page migration vs. overcommit
Message-ID: <20171123092149.tnfl2dcswg2iv3s3@dhcp22.suse.cz>
References: <20171122152832.iayefrlxbugphorp@dhcp22.suse.cz>
 <91969714-5256-e96f-a48b-43af756a2686@oracle.com>
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To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-mm@kvack.org, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, LKML <linux-kernel@vger.kernel.org>

On Wed 22-11-17 11:11:38, Mike Kravetz wrote:
> On 11/22/2017 07:28 AM, Michal Hocko wrote:
[...]
> > Why don't we simply migrate as long as we are able to allocate the
> > target hugetlb page? I have a half baked patch to remove this
> > restriction, would there be an opposition to do something like that?
> 
> I would not be opposed and would help with this effort.  My concern would
> be any subtle hugetlb accounting issues once you start messing with
> additional overcommit pages.

Well my current (crude) patch checks for overcommit in the destructor
and releases the page if we are over. That should deal with accounting
AFAICS.
-- 
Michal Hocko
SUSE Labs

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