linux-kernel - Re: [PATCH v2 1/6] mm: migrate: do not migrate HugeTLB page whose refcount is one

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Message-ID: <20210106161327.GR13207@dhcp22.suse.cz>
Date:   Wed, 6 Jan 2021 17:13:27 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        n-horiguchi@...jp.nec.com, ak@...ux.intel.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Yang Shi <shy828301@...il.com>
Subject: Re: [PATCH v2 1/6] mm: migrate: do not migrate HugeTLB page whose
 refcount is one

On Wed 06-01-21 16:47:34, 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?
-- 
Michal Hocko
SUSE Labs