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 (Oracle)" <willy@infradead.org>,
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Cc: Thomas Gleixner <tglx@linutronix.de>,
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Pedro Fonseca <pfonseca@purdue.edu>,
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Huichun Feng <foxhoundsk.tw@gmail.com>
Subject: [PATCH v5 14/17] fs/proc: Support COW PTE with clear_refs_write
Date: Fri, 14 Apr 2023 22:23:38 +0800 [thread overview]
Message-ID: <20230414142341.354556-15-shiyn.lin@gmail.com> (raw)
In-Reply-To: <20230414142341.354556-1-shiyn.lin@gmail.com>
Before clearing the entry in COW-ed PTE, break COW PTE first.
Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com>
---
fs/proc/task_mmu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 6a96e1713fd5..c76b74029dfd 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1195,6 +1195,11 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
if (pmd_trans_unstable(pmd))
return 0;
+ /* Only break COW when we modify the soft-dirty bit. */
+ if (cp->type == CLEAR_REFS_SOFT_DIRTY &&
+ break_cow_pte(vma, pmd, addr))
+ return 0;
+
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; pte++, addr += PAGE_SIZE) {
ptent = *pte;
--
2.34.1
next prev parent reply other threads:[~2023-04-14 14:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-14 14:23 [PATCH v5 00/17] Introduce Copy-On-Write to Page Table Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 01/17] mm: Split out the present cases from zap_pte_range() Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 02/17] mm: Allow user to control COW PTE via prctl Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 03/17] mm: Add Copy-On-Write PTE to fork() Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 04/17] mm: Add break COW PTE fault and helper functions Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 05/17] mm: Handle COW-ed PTE during zapping Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 06/17] mm/rmap: Break COW PTE in rmap walking Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 07/17] mm/khugepaged: Break COW PTE before scanning pte Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 08/17] mm/ksm: Break COW PTE before modify shared PTE Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 09/17] mm/madvise: Handle COW-ed PTE with madvise() Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 10/17] mm/gup: Trigger break COW PTE before calling follow_pfn_pte() Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 11/17] mm/mprotect: Break COW PTE before changing protection Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 12/17] mm/userfaultfd: Support COW PTE Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 13/17] mm/migrate_device: " Chih-En Lin
2023-04-14 14:23 ` Chih-En Lin [this message]
2023-04-14 14:23 ` [PATCH v5 15/17] events/uprobes: Break COW PTE before replacing page Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 16/17] mm: fork: Enable COW PTE to fork system call Chih-En Lin
2023-04-14 14:23 ` [PATCH v5 17/17] mm: Check the unexpected modification of COW-ed PTE Chih-En Lin
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