linux-kernel - Re: [PATCH 1/2] mm: Allow architectures to request 'old' entries when prefaulting

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Message-ID: <20201226214106.GA5479@casper.infradead.org>
Date:   Sat, 26 Dec 2020 21:41:06 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jan Kara <jack@...e.cz>, Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH 1/2] mm: Allow architectures to request 'old' entries
 when prefaulting

On Sat, Dec 26, 2020 at 11:43:35PM +0300, Kirill A. Shutemov wrote:
> +static struct page *next_stable_page(struct page *page, struct vm_fault *vmf,
> +				     struct xa_state *xas, pgoff_t end_pgoff)

A "stable page" means one that doesn't currently have an outstanding
write (see wait_for_stable_page()).  It's really "Next trivially
insertable page".  I might call it "next_uptodate_page()" and gloss
over the other reasons this might fail to return a page.