linux-kernel - Re: hugetlb page migration vs. overcommit

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Message-ID: <20171123092149.tnfl2dcswg2iv3s3@dhcp22.suse.cz>
Date:   Thu, 23 Nov 2017 10:21:49 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: hugetlb page migration vs. overcommit

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