linux-kernel - Re: [PATCH 1/6] mm: migrate: do not migrate HugeTLB page whose refcount is one

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Message-ID: <20210106161236.GQ13207@dhcp22.suse.cz>
Date:   Wed, 6 Jan 2021 17:12:36 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        hillf.zj@...baba-inc.com, n-horiguchi@...jp.nec.com,
        ak@...ux.intel.com, yongjun_wei@...ndmicro.com.cn,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] mm: migrate: do not migrate HugeTLB page whose
 refcount is one

On Wed 06-01-21 17:11:39, Michal Hocko wrote:
> On Mon 04-01-21 14:58:38, Muchun Song wrote:
> > If the refcount is one when it is migrated, it means that the page
> > was freed from under us. So we are done and do not need to migrate.
> 
> Is this common enough that it would warrant the explicit check for each
> migration?

Ups, just noticed that you have posted a newer version. I will follow up
there.

-- 
Michal Hocko
SUSE Labs