From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
xishi.qiuxishi@alibaba-inc.com,
Laurent Dufour <ldufour@linux.vnet.ibm.com>
Subject: [RFC][PATCH v1 09/11] mm: hwpoison: apply buddy page handling code to hard-offline
Date: Fri, 9 Nov 2018 15:47:13 +0900 [thread overview]
Message-ID: <1541746035-13408-10-git-send-email-n-horiguchi@ah.jp.nec.com> (raw)
In-Reply-To: <1541746035-13408-1-git-send-email-n-horiguchi@ah.jp.nec.com>
Hard-offline of free buddy pages can be handled in the same manner as
soft-offline. So this patch applies the new semantics to hard-offline to
more complete isolation of offlined page. As a result, the successful
case is worth MF_RECOVERED instead of MF_DELAYED, so this patch also
changes it.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
mm/memory-failure.c | 38 ++++++++++++++++++++++++++++----------
1 file changed, 28 insertions(+), 10 deletions(-)
diff --git v4.19-mmotm-2018-10-30-16-08/mm/memory-failure.c v4.19-mmotm-2018-10-30-16-08_patched/mm/memory-failure.c
index ecafd4a..af541141 100644
--- v4.19-mmotm-2018-10-30-16-08/mm/memory-failure.c
+++ v4.19-mmotm-2018-10-30-16-08_patched/mm/memory-failure.c
@@ -772,6 +772,16 @@ static int me_swapcache_clean(struct page *p, unsigned long pfn)
return MF_FAILED;
}
+static int me_huge_free_page(struct page *p)
+{
+ int rc = dissolve_free_huge_page(p);
+
+ if (!rc && set_hwpoison_free_buddy_page(p))
+ return MF_RECOVERED;
+ else
+ return MF_FAILED;
+}
+
/*
* Huge pages. Needs work.
* Issues:
@@ -799,8 +809,7 @@ static int me_huge_page(struct page *p, unsigned long pfn)
*/
if (PageAnon(hpage))
put_page(hpage);
- dissolve_free_huge_page(p);
- res = MF_RECOVERED;
+ res = me_huge_free_page(p);
lock_page(hpage);
}
@@ -1108,8 +1117,11 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
}
}
unlock_page(head);
- dissolve_free_huge_page(p);
- action_result(pfn, MF_MSG_FREE_HUGE, MF_DELAYED);
+
+ res = me_huge_free_page(p);
+ if (res == MF_FAILED)
+ num_poisoned_pages_dec();
+ action_result(pfn, MF_MSG_FREE_HUGE, res);
return 0;
}
@@ -1270,6 +1282,13 @@ int memory_failure(unsigned long pfn, int flags)
p = pfn_to_page(pfn);
if (PageHuge(p))
return memory_failure_hugetlb(pfn, flags);
+
+ if (set_hwpoison_free_buddy_page(p)) {
+ action_result(pfn, MF_MSG_BUDDY, MF_RECOVERED);
+ num_poisoned_pages_inc();
+ return 0;
+ }
+
if (TestSetPageHWPoison(p)) {
pr_err("Memory failure: %#lx: already hardware poisoned\n",
pfn);
@@ -1281,8 +1300,7 @@ int memory_failure(unsigned long pfn, int flags)
/*
* We need/can do nothing about count=0 pages.
- * 1) it's a free page, and therefore in safe hand:
- * prep_new_page() will be the gate keeper.
+ * 1) it's a free page, and removed from buddy allocator.
* 2) it's part of a non-compound high order page.
* Implies some kernel user: cannot stop them from
* R/W the page; let's pray that the page has been
@@ -1291,8 +1309,8 @@ int memory_failure(unsigned long pfn, int flags)
* that may make page_ref_freeze()/page_ref_unfreeze() mismatch.
*/
if (!get_hwpoison_page(p)) {
- if (is_free_buddy_page(p)) {
- action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
+ if (set_hwpoison_free_buddy_page(p)) {
+ action_result(pfn, MF_MSG_BUDDY, MF_RECOVERED);
return 0;
} else {
action_result(pfn, MF_MSG_KERNEL_HIGH_ORDER, MF_IGNORED);
@@ -1330,8 +1348,8 @@ int memory_failure(unsigned long pfn, int flags)
*/
shake_page(p, 0);
/* shake_page could have turned it free. */
- if (!PageLRU(p) && is_free_buddy_page(p)) {
- action_result(pfn, MF_MSG_BUDDY_2ND, MF_DELAYED);
+ if (!PageLRU(p) && set_hwpoison_free_buddy_page(p)) {
+ action_result(pfn, MF_MSG_BUDDY_2ND, MF_RECOVERED);
return 0;
}
--
2.7.0
next prev parent reply other threads:[~2018-11-09 6:47 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-09 6:47 [PATCH RFC v1 00/11] hwpoison improvement part 1 Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 01/11] mm: hwpoison: cleanup unused PageHuge() check Naoya Horiguchi
2018-11-09 9:52 ` Anshuman Khandual
2018-11-09 6:47 ` [RFC][PATCH v1 02/11] mm: soft-offline: add missing error check of set_hwpoison_free_buddy_page() Naoya Horiguchi
2018-11-09 10:20 ` Anshuman Khandual
2018-11-13 0:16 ` Naoya Horiguchi
2018-11-14 8:53 ` Anshuman Khandual
2018-11-09 6:47 ` [RFC][PATCH v1 03/11] mm: move definition of num_poisoned_pages_inc/dec to include/linux/mm.h Naoya Horiguchi
2018-11-09 10:28 ` Anshuman Khandual
2018-11-13 0:17 ` Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 04/11] mm: madvise: call soft_offline_page() without MF_COUNT_INCREASED Naoya Horiguchi
2018-11-09 10:46 ` Anshuman Khandual
2018-11-13 0:18 ` Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 05/11] mm: hwpoison-inject: don't pin for hwpoison_filter() Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 06/11] mm: hwpoison: remove MF_COUNT_INCREASED Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 07/11] mm: remove flag argument from soft offline functions Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 08/11] mm: soft-offline: isolate error pages from buddy freelist Naoya Horiguchi
2018-11-09 6:47 ` Naoya Horiguchi [this message]
2018-11-09 6:47 ` [RFC][PATCH v1 10/11] mm: clear PageHWPoison in memory hotremove Naoya Horiguchi
2018-11-13 1:32 ` Naoya Horiguchi
2018-11-09 6:47 ` [RFC][PATCH v1 11/11] mm: hwpoison: introduce clear_hwpoison_free_buddy_page() Naoya Horiguchi
2018-11-09 11:33 ` Anshuman Khandual
2018-11-13 0:19 ` Naoya Horiguchi
2018-11-14 8:23 ` Anshuman Khandual
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