linux-kernel - Re: [External] Re: [PATCH v9 06/11] mm/hugetlb: Set the PageHWPoison to the raw error page

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Message-ID: <CAMZfGtWfXYn5Na=qQJHEZJO3wTOrf1m=-xarxTLp_pYpZoqjWw@mail.gmail.com>
Date:   Wed, 16 Dec 2020 21:51:43 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Oscar Salvador <osalvador@...e.de>
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>,
        Michal Hocko <mhocko@...e.com>,
        "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        David Hildenbrand <david@...hat.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 v9 06/11] mm/hugetlb: Set the PageHWPoison
 to the raw error page

On Wed, Dec 16, 2020 at 9:28 PM Oscar Salvador <osalvador@...e.de> wrote:
>
> On Sun, Dec 13, 2020 at 11:45:29PM +0800, Muchun Song wrote:
> > Because we reuse the first tail vmemmap page frame and remap it
> > with read-only, we cannot set the PageHWPosion on a tail page.
> > So we can use the head[4].private to record the real error page
> > index and set the raw error page PageHWPoison later.
>
> Maybe the following is better?
>
> "Since the first page of tail page structs is remapped read-only,
>  we cannot modify any tail struct page, and so we cannot set
>  the HWPoison flag on a tail page.
>  We can make use of head[4].private to record the real hwpoisoned
>  page index.
>  Right before freeing the page the real raw page will be retrieved
>  and marked as HWPoison.
> "
>
> I think it is slighly clearer, but whatever.

Thank you.

>
> > Signed-off-by: Muchun Song <songmuchun@...edance.com>
>
> I do not quite like the name hwpoison_subpage_deliver, but I cannot
> come up with a better one myself, so:
>
> Reviewed-by: Oscar Salvador <osalvador@...e.de>

Thanks for your review.

>
> --
> Oscar Salvador
> SUSE L3



-- 
Yours,
Muchun