From: Jan Kara <jack@suse.cz>
To: Matthew Wilcox <willy@infradead.org>
Cc: Jan Kara <jack@suse.cz>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
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: Thu, 14 Feb 2019 17:27:41 +0100 [thread overview]
Message-ID: <20190214162741.GA23000@quack2.suse.cz> (raw)
In-Reply-To: <20190213201715.GU12668@bombadil.infradead.org>
On Wed 13-02-19 12:17:15, Matthew Wilcox wrote:
> > > - pages[ret] = page;
> > > + pages[ret] = find_subpage(page, xas.xa_index);
> > > if (++ret == nr_pages) {
> > > *start = page->index + 1;
> > > goto out;
> > > }
> >
> > So this subtly changes the behavior because now we will be returning in
> > '*start' a different index. So you should rather use 'pages[ret]->index'
> > instead.
>
> You're right, I made a mistake there. However, seeing this:
> https://lore.kernel.org/lkml/20190110030838.84446-1-yuzhao@google.com/
>
> makes me think that I should be using xa_index + 1 there.
Yeah, you're right. Thanks!
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2019-02-14 16:27 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 [this message]
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
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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