linux-kernel - Re: [PATCH 1/3] mm, page_owner: record page owner for each subpage

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Message-ID: <20190819115751.bost7nrac4at7pq3@black.fi.intel.com>
Date:   Mon, 19 Aug 2019 14:57:51 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH 1/3] mm, page_owner: record page owner for each subpage

On Mon, Aug 19, 2019 at 11:55:51AM +0000, Kirill A. Shutemov wrote:
> > @@ -2533,6 +2534,8 @@ static void __split_huge_page(struct page *page, struct list_head *list,
> >  
> >  	remap_page(head);
> >  
> > +	split_page_owner(head, HPAGE_PMD_ORDER);
> > +
> 
> I think it has to be before remap_page(). This way nobody would be able to
> mess with the page until it has valid page_owner.

Or rather next to ClearPageCompound().

-- 
 Kirill A. Shutemov