From: Chih-En Lin <shiyn.lin@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Qi Zheng <zhengqi.arch@bytedance.com>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
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Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
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"Eric W . Biederman" <ebiederm@xmission.com>,
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Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Andy Lutomirski <luto@kernel.org>,
Fenghua Yu <fenghua.yu@intel.com>,
Barret Rhoden <brho@google.com>,
Davidlohr Bueso <dave@stgolabs.net>,
"Jason A . Donenfeld" <Jason@zx2c4.com>,
Dinglan Peng <peng301@purdue.edu>,
Pedro Fonseca <pfonseca@purdue.edu>,
Jim Huang <jserv@ccns.ncku.edu.tw>,
Huichun Feng <foxhoundsk.tw@gmail.com>,
Chih-En Lin <shiyn.lin@gmail.com>
Subject: [PATCH v3 06/14] mm/ksm: Break COW PTE before modify shared PTE
Date: Tue, 20 Dec 2022 15:27:35 +0800 [thread overview]
Message-ID: <20221220072743.3039060-7-shiyn.lin@gmail.com> (raw)
In-Reply-To: <20221220072743.3039060-1-shiyn.lin@gmail.com>
Break COW PTE before merge the page that reside in COW-ed PTE.
Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com>
---
mm/ksm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/ksm.c b/mm/ksm.c
index c19fcca9bc03d..896a14c44a858 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1017,7 +1017,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
pte_t *orig_pte)
{
struct mm_struct *mm = vma->vm_mm;
- DEFINE_PAGE_VMA_WALK(pvmw, page, vma, 0, 0);
+ DEFINE_PAGE_VMA_WALK(pvmw, page, vma, 0, PVMW_BREAK_COW_PTE);
int swapped;
int err = -EFAULT;
struct mmu_notifier_range range;
@@ -1136,6 +1136,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
barrier();
if (!pmd_present(pmde) || pmd_trans_huge(pmde))
goto out;
+ if (break_cow_pte(vma, pmd, addr) < 0)
+ goto out;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr,
addr + PAGE_SIZE);
--
2.37.3
next prev parent reply other threads:[~2022-12-20 7:26 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-20 7:27 [PATCH v3 00/14] Introduce Copy-On-Write to Page Table Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 01/14] mm: Allow user to control COW PTE via prctl Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 02/14] mm: Add Copy-On-Write PTE to fork() Chih-En Lin
2022-12-20 10:59 ` kernel test robot
2022-12-20 12:42 ` kernel test robot
2022-12-20 7:27 ` [PATCH v3 03/14] mm: Add break COW PTE fault and helper functions Chih-En Lin
2022-12-20 12:00 ` kernel test robot
2022-12-20 7:27 ` [PATCH v3 04/14] mm/rmap: Break COW PTE in rmap walking Chih-En Lin
2022-12-26 9:40 ` Barry Song
2022-12-26 10:59 ` Chih-En Lin
2022-12-27 1:15 ` Barry Song
2022-12-27 2:40 ` Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 05/14] mm/khugepaged: Break COW PTE before scanning pte Chih-En Lin
2022-12-20 7:27 ` Chih-En Lin [this message]
2022-12-20 7:27 ` [PATCH v3 07/14] mm/madvise: Handle COW-ed PTE with madvise() Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 08/14] mm/gup: Break COW PTE in follow_pfn_pte() Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 09/14] mm/mprotect: Break COW PTE before changing protection Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 10/14] mm/userfaultfd: Support COW PTE Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 11/14] mm/migrate_device: " Chih-En Lin
2022-12-20 11:50 ` kernel test robot
2022-12-20 14:23 ` kernel test robot
2022-12-20 7:27 ` [PATCH v3 12/14] fs/proc: Support COW PTE with clear_refs_write Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 13/14] events/uprobes: Break COW PTE before replacing page Chih-En Lin
2022-12-20 7:27 ` [PATCH v3 14/14] mm: fork: Enable COW PTE to fork system call Chih-En Lin
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