linux-kernel - Re: [External] Re: [PATCH v16 4/9] mm: hugetlb: alloc the vmemmap pages associated with each HugeTLB page

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Message-ID: <YDN4hhhINcn69CeV@dhcp22.suse.cz>
Date:   Mon, 22 Feb 2021 10:25:26 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, viro@...iv.linux.org.uk,
        Andrew Morton <akpm@...ux-foundation.org>, paulmck@...nel.org,
        mchehab+huawei@...nel.org, pawan.kumar.gupta@...ux.intel.com,
        Randy Dunlap <rdunlap@...radead.org>, oneukum@...e.com,
        anshuman.khandual@....com, jroedel@...e.de,
        Mina Almasry <almasrymina@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oscar Salvador <osalvador@...e.de>,
        "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        David Hildenbrand <david@...hat.com>,
        HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Xiongchun duan <duanxiongchun@...edance.com>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [External] Re: [PATCH v16 4/9] mm: hugetlb: alloc the vmemmap
 pages associated with each HugeTLB page

On Sat 20-02-21 12:20:36, Muchun Song wrote:
> On Fri, Feb 19, 2021 at 10:12 PM Michal Hocko <mhocko@...e.com> wrote:
[...]
> > What about hugetlb page poisoning on HW failure (resp. soft offlining)?
> 
> If the HW poisoned hugetlb page failed to be dissolved, the page
> will go back to the free list with PG_HWPoison set. But the page
> will not be used, because we will check whether the page is HW
> poisoned when it is dequeued from the free list. If so, we will skip
> this page.

Can this lead to an underprovisioned pool then? Or is there a new
hugetlb allocated to replace the poisoned one?

-- 
Michal Hocko
SUSE Labs