From: Miaohe Lin <linmiaohe@huawei.com>
To: <akpm@linux-foundation.org>, <naoya.horiguchi@nec.com>
Cc: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
<linmiaohe@huawei.com>
Subject: [PATCH 6/8] mm/memory-failure.c: rework the try_to_unmap logic in hwpoison_user_mappings()
Date: Thu, 10 Feb 2022 22:17:31 +0800 [thread overview]
Message-ID: <20220210141733.1908-7-linmiaohe@huawei.com> (raw)
In-Reply-To: <20220210141733.1908-1-linmiaohe@huawei.com>
Only for hugetlb pages in shared mappings, try_to_unmap should take
semaphore in write mode here. Rework the code to make it clear.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
mm/memory-failure.c | 34 +++++++++++++++-------------------
1 file changed, 15 insertions(+), 19 deletions(-)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 71bd78279669..78aba0b3e983 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1405,26 +1405,22 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
if (kill)
collect_procs(hpage, &tokill, flags & MF_ACTION_REQUIRED);
- if (!PageHuge(hpage)) {
- try_to_unmap(hpage, ttu);
+ if (PageHuge(hpage) && !PageAnon(hpage)) {
+ /*
+ * For hugetlb pages in shared mappings, try_to_unmap
+ * could potentially call huge_pmd_unshare. Because of
+ * this, take semaphore in write mode here and set
+ * TTU_RMAP_LOCKED to indicate we have taken the lock
+ * at this higher level.
+ */
+ mapping = hugetlb_page_mapping_lock_write(hpage);
+ if (mapping) {
+ try_to_unmap(hpage, ttu|TTU_RMAP_LOCKED);
+ i_mmap_unlock_write(mapping);
+ } else
+ pr_info("Memory failure: %#lx: could not lock mapping for mapped huge page\n", pfn);
} else {
- if (!PageAnon(hpage)) {
- /*
- * For hugetlb pages in shared mappings, try_to_unmap
- * could potentially call huge_pmd_unshare. Because of
- * this, take semaphore in write mode here and set
- * TTU_RMAP_LOCKED to indicate we have taken the lock
- * at this higher level.
- */
- mapping = hugetlb_page_mapping_lock_write(hpage);
- if (mapping) {
- try_to_unmap(hpage, ttu|TTU_RMAP_LOCKED);
- i_mmap_unlock_write(mapping);
- } else
- pr_info("Memory failure: %#lx: could not lock mapping for mapped huge page\n", pfn);
- } else {
- try_to_unmap(hpage, ttu);
- }
+ try_to_unmap(hpage, ttu);
}
unmap_success = !page_mapped(hpage);
--
2.23.0
next prev parent reply other threads:[~2022-02-10 14:21 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-10 14:17 [PATCH 0/8] mm/memory-failure.c: A few cleanup patches for memory failure Miaohe Lin
2022-02-10 14:17 ` [PATCH 1/8] mm/memory-failure.c: minor clean up for memory_failure_dev_pagemap Miaohe Lin
2022-02-14 14:47 ` Naoya Horiguchi
2022-02-10 14:17 ` [PATCH 2/8] mm/memory-failure.c: avoid walking page table when vma_address() return -EFAULT Miaohe Lin
2022-02-14 14:48 ` Naoya Horiguchi
2022-02-15 2:40 ` Miaohe Lin
2022-02-15 8:37 ` HORIGUCHI NAOYA(堀口 直也)
2022-02-15 9:35 ` Miaohe Lin
2022-02-10 14:17 ` [PATCH 3/8] mm/memory-failure.c: rework the signaling logic in kill_proc Miaohe Lin
2022-02-14 14:48 ` Naoya Horiguchi
2022-02-10 14:17 ` [PATCH 4/8] mm/memory-failure.c: remove unneeded orig_head Miaohe Lin
2022-02-14 14:50 ` Naoya Horiguchi
2022-02-15 3:14 ` Miaohe Lin
2022-02-15 8:48 ` HORIGUCHI NAOYA(堀口 直也)
2022-02-15 9:28 ` Miaohe Lin
2022-02-10 14:17 ` [PATCH 5/8] mm/memory-failure.c: remove PageSlab check in hwpoison_filter_dev Miaohe Lin
2022-02-14 14:50 ` Naoya Horiguchi
2022-02-10 14:17 ` Miaohe Lin [this message]
2022-02-14 14:51 ` [PATCH 6/8] mm/memory-failure.c: rework the try_to_unmap logic in hwpoison_user_mappings() Naoya Horiguchi
2022-02-10 14:17 ` [PATCH 7/8] mm/memory-failure.c: remove obsolete comment in __soft_offline_page Miaohe Lin
2022-02-10 14:17 ` [PATCH 8/8] mm/memory-failure.c: remove unnecessary PageTransTail check Miaohe Lin
2022-02-14 14:54 ` Naoya Horiguchi
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