From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>,
linux-mm@kvack.org,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH] mm: Improve dump_page() for compound pages
Date: Tue, 11 Feb 2020 00:54:49 +0300 [thread overview]
Message-ID: <20200210215449.ao7q5x4no5y2j6pc@box> (raw)
In-Reply-To: <85d46612-b5b1-f566-7026-e4fec9166c3b@nvidia.com>
On Mon, Feb 10, 2020 at 01:33:22PM -0800, John Hubbard wrote:
> > PageSlab() can be called for the head page.
>
>
> It's not clear to me whether it's safer to use the...user-provided page, or the
> head page, for checking PageSlab()--it's probably set on both head and non-head
> pages, right?
PageSlab() will call compound_head() inside.
> I guess you're saying it should be like this:
>
> mapcount = PageSlab(head) ? 0 : page_mapcount(page);
>
> ...yes?
Yes.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2020-02-10 21:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 4:44 Matthew Wilcox
2020-02-08 4:48 ` Matthew Wilcox
2020-02-09 1:09 ` John Hubbard
2020-02-09 1:12 ` Matthew Wilcox
2020-02-09 1:18 ` John Hubbard
2020-02-10 12:42 ` Kirill A. Shutemov
2020-02-10 19:50 ` John Hubbard
2020-02-10 21:21 ` Kirill A. Shutemov
2020-02-10 21:33 ` John Hubbard
2020-02-10 21:54 ` Kirill A. Shutemov [this message]
2020-02-10 22:00 ` John Hubbard
2020-02-10 22:02 ` Matthew Wilcox
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