From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Matthew Wilcox <willy@infradead.org>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, Hugh Dickins <hughd@google.com>,
William Kucharski <william.kucharski@oracle.com>
Subject: Re: [PATCH v2] page cache: Store only head pages in i_pages
Date: Fri, 15 Feb 2019 01:29:57 +0300 [thread overview]
Message-ID: <20190214222957.a5o7zkc6p7zlqy3m@kshutemo-mobl1> (raw)
In-Reply-To: <20190214221158.GF12668@bombadil.infradead.org>
On Thu, Feb 14, 2019 at 02:11:58PM -0800, Matthew Wilcox wrote:
> On Fri, Feb 15, 2019 at 01:08:10AM +0300, Kirill A. Shutemov wrote:
> > On Thu, Feb 14, 2019 at 01:17:57PM -0800, Matthew Wilcox wrote:
> > > On Thu, Feb 14, 2019 at 04:30:04PM +0300, Kirill A. Shutemov wrote:
> > > > - migrate_page_move_mapping() has to be converted too.
> > >
> > > I think that's as simple as:
> > >
> > > +++ b/mm/migrate.c
> > > @@ -465,7 +465,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
> > >
> > > for (i = 1; i < HPAGE_PMD_NR; i++) {
> > > xas_next(&xas);
> > > - xas_store(&xas, newpage + i);
> > > + xas_store(&xas, newpage);
> > > }
> > > }
> > >
> > >
> > > or do you see something else I missed?
> >
> > Looks right to me.
> >
> > BTW, maybe some add syntax sugar from XArray side?
> >
> > Replace the loop and xas_store() before it with:
> >
> > xas_fill(&xas, newpage, 1UL << compound_order(newpage));
> >
> > or something similar?
>
> If we were keeping this code longterm, then yes, something like that
> would be great. I'm hoping this code is a mere stepping stone towards
> using multi-slot entries for the page cache.
Fair enough.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2019-02-14 22:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-12 18:34 [PATCH v2] page cache: Store only head pages in i_pages Matthew Wilcox
2019-02-13 14:41 ` Jan Kara
2019-02-13 20:17 ` Matthew Wilcox
2019-02-14 16:27 ` Jan Kara
2019-02-14 13:30 ` Kirill A. Shutemov
2019-02-14 20:53 ` Matthew Wilcox
2019-02-14 22:03 ` Kirill A. Shutemov
2019-02-14 22:25 ` Matthew Wilcox
2019-02-14 21:17 ` Matthew Wilcox
2019-02-14 22:08 ` Kirill A. Shutemov
2019-02-14 22:11 ` Matthew Wilcox
2019-02-14 22:29 ` Kirill A. Shutemov [this message]
2019-02-14 22:29 ` Kirill A. Shutemov
2019-02-15 20:28 ` Matthew Wilcox
2019-02-14 22:41 ` Kirill A. Shutemov
2019-02-15 20:20 ` Matthew Wilcox
2019-02-15 21:17 ` Kirill A. Shutemov
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