linux-kernel - [PATCH, RFC 15/16] thp, mm: split huge page on mmap file page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1359365068-10147-16-git-send-email-kirill.shutemov@linux.intel.com>
Date:	Mon, 28 Jan 2013 11:24:27 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>
Cc:	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH, RFC 15/16] thp, mm: split huge page on mmap file page

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

We are not ready to mmap file-backed tranparent huge pages. Let's split
them on mmap() attempt.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/filemap.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/filemap.c b/mm/filemap.c
index a7331fb..2e08582 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1692,6 +1692,8 @@ retry_find:
 			goto no_cached_page;
 	}
 
+	if (PageTransCompound(page))
+		split_huge_page(page);
 	if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) {
 		page_cache_release(page);
 		return ret | VM_FAULT_RETRY;
-- 
1.7.10.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/