From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-mm@kvack.org
Cc: Andi Kleen <ak@linux.intel.com>,
"H. Peter Anvin" <hpa@linux.intel.com>,
linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill@shutemov.name>,
David Rientjes <rientjes@google.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH v6 05/12] thp: change_huge_pmd(): keep huge zero page write-protected
Date: Thu, 15 Nov 2012 21:26:55 +0200 [thread overview]
Message-ID: <1353007622-18393-6-git-send-email-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <1353007622-18393-1-git-send-email-kirill.shutemov@linux.intel.com>
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
We want to get page fault on write attempt to huge zero page, so let's
keep it write-protected.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/huge_memory.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f5589c0..42607a1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1245,6 +1245,8 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
pmd_t entry;
entry = pmdp_get_and_clear(mm, addr, pmd);
entry = pmd_modify(entry, newprot);
+ if (is_huge_zero_pmd(entry))
+ entry = pmd_wrprotect(entry);
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
ret = 1;
--
1.7.11.7
--
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next prev parent reply other threads:[~2012-11-15 19:25 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-15 19:26 [PATCH v6 00/12] Introduce huge zero page Kirill A. Shutemov
2012-11-15 19:26 ` [PATCH v6 01/12] thp: huge zero page: basic preparation Kirill A. Shutemov
2012-11-15 19:26 ` [PATCH v6 02/12] thp: zap_huge_pmd(): zap huge zero pmd Kirill A. Shutemov
2012-11-15 19:26 ` [PATCH v6 03/12] thp: copy_huge_pmd(): copy huge zero page Kirill A. Shutemov
2012-11-15 22:32 ` [patch] thp: copy_huge_pmd(): copy huge zero page v6 fix David Rientjes
2012-11-15 19:26 ` [PATCH v6 04/12] thp: do_huge_pmd_wp_page(): handle huge zero page Kirill A. Shutemov
2012-11-15 19:26 ` Kirill A. Shutemov [this message]
2012-11-15 19:26 ` [PATCH v6 06/12] thp: change split_huge_page_pmd() interface Kirill A. Shutemov
2012-11-15 19:26 ` [PATCH v6 07/12] thp: implement splitting pmd for huge zero page Kirill A. Shutemov
2012-11-15 19:26 ` [PATCH v6 08/12] thp: setup huge zero page on non-write page fault Kirill A. Shutemov
2012-11-15 19:26 ` [PATCH v6 09/12] thp: lazy huge zero page allocation Kirill A. Shutemov
2012-11-15 19:27 ` [PATCH v6 10/12] thp: implement refcounting for huge zero page Kirill A. Shutemov
2012-11-18 6:23 ` Jaegeuk Hanse
2012-11-19 9:56 ` Kirill A. Shutemov
2012-11-19 10:20 ` Jaegeuk Hanse
2012-11-19 10:23 ` Kirill A. Shutemov
2012-11-19 11:02 ` Jaegeuk Hanse
2012-11-19 11:09 ` Kirill A. Shutemov
2012-11-19 11:29 ` Jaegeuk Hanse
2012-11-15 19:27 ` [PATCH v6 11/12] thp, vmstat: implement HZP_ALLOC and HZP_ALLOC_FAILED events Kirill A. Shutemov
2012-11-15 19:27 ` [PATCH v6 12/12] thp: introduce sysfs knob to disable huge zero page Kirill A. Shutemov
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