linux-kernel - Re: [PATCH v7 08/14] mm,hwpoison: rework soft offline for free pages

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Message-ID: <20200923072733.GA15221@hori.linux.bs1.fc.nec.co.jp>
Date:   Wed, 23 Sep 2020 07:27:33 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Oscar Salvador <osalvador@...e.de>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "aris@...vo.org" <aris@...vo.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "cai@....pw" <cai@....pw>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH v7 08/14] mm,hwpoison: rework soft offline for free pages

On Tue, Sep 22, 2020 at 03:56:44PM +0200, Oscar Salvador wrote:
> When trying to soft-offline a free page, we need to first take it off the
> buddy allocator.
> Once we know is out of reach, we can safely flag it as poisoned.
> 
> take_page_off_buddy will be used to take a page meant to be poisoned off
> the buddy allocator. take_page_off_buddy calls break_down_buddy_pages,
> which splits a higher-order page in case our page belongs to one.
> 
> Once the page is under our control, we call page_handle_poison to set it
> as poisoned and grab a refcount on it.
> 
> Signed-off-by: Oscar Salvador <osalvador@...e.de>

Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>