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,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH 1/2] mm: Remove redundant test from find_get_pages_contig
Date: Fri, 23 Nov 2018 13:47:32 +0300 [thread overview]
Message-ID: <20181123104732.gvhdqyddbsiq3i42@kshutemo-mobl1> (raw)
In-Reply-To: <20181122213224.12793-2-willy@infradead.org>
On Thu, Nov 22, 2018 at 01:32:23PM -0800, Matthew Wilcox wrote:
> After we establish a reference on the page, we check the pointer continues
> to be in the correct position in i_pages. There's no need to check the
> page->mapping or page->index afterwards; if those can change after we've
> got the reference, they can change after we return the page to the caller.
Hm. IIRC, page->mapping can be set to NULL due truncation, but what about
index? When it can be changed? Truncation doesn't touch it.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2018-11-23 10:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-22 21:32 [PATCH 0/2] Better support for THP in page cache Matthew Wilcox
2018-11-22 21:32 ` [PATCH 1/2] mm: Remove redundant test from find_get_pages_contig Matthew Wilcox
2018-11-23 10:47 ` Kirill A. Shutemov [this message]
2018-11-23 17:59 ` Matthew Wilcox
2018-11-22 21:32 ` [PATCH 2/2] page cache: Store only head pages in i_pages Matthew Wilcox
2018-11-23 10:56 ` Kirill A. Shutemov
2018-11-23 17:19 ` Matthew Wilcox
2018-11-23 17:36 ` Kirill A. Shutemov
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