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a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1787514072; l=2540; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=vCHjJBFQNgP1MdM2vs0H0cX8vGGek8P/ghWBajkazgE=; b=2sOGcjZM07dUbENkG7ka8LU+3w8x7MPjDTsuM6RqhzWcVud3VEqIB1Z/Pld7tKcRttGXPnsFr /62srT92oGsA7CVfqsivq5aDykS/C493DC4/WQwo3KfT2kM0654yUZf X-Mailer: b4 0.14.3 Message-ID: <20260823-memory-failure-mf-delayed-fix-v5-1-d97a5703e45a@google.com> Subject: [PATCH v5 1/5] mm: memory_failure: Clarify the MF_DELAYED definition From: Lisa Wang To: Miaohe Lin , Naoya Horiguchi , Andrew Morton , Paolo Bonzini , Shuah Khan , Hugh Dickins , Baolin Wang , David Hildenbrand , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Andi Kleen , Hidehiro Kawai , Rik van Riel , Yu Zhang , Lorenzo Stoakes , "Liam R. Howlett" Cc: rientjes@google.com, seanjc@google.com, ackerleytng@google.com, vannapurve@google.com, michael.roth@amd.com, jiaqiyan@google.com, tabba@google.com, dave.hansen@linux.intel.com, Lisa Wang , Isaku Yamahata , Xiaoyao Li Content-Type: text/plain; charset="utf-8" X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 8B36EC000B X-Stat-Signature: 3gx7eox1mndzfg96tndmdiabtmmdxcqc X-HE-Tag: 1787514075-839756 X-HE-Meta: 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 a5qAj1c8 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This patch clarifies the definition of MF_DELAYED to represent cases where a folio's removal is initiated but not immediately completed (e.g., due to remaining metadata references). Acked-by: David Hildenbrand (Arm) Acked-by: Miaohe Lin Reviewed-by: Ackerley Tng Signed-off-by: Lisa Wang --- mm/memory-failure.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index aaf14608b30e..e698d0e9711d 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -847,24 +847,25 @@ static int kill_accessing_process(struct task_struct *p, unsigned long pfn, } /* - * MF_IGNORED - The m-f() handler marks the page as PG_hwpoisoned'ed. + * MF_IGNORED - The m-f() handler marks the page as PG_hwpoison'ed. * But it could not do more to isolate the page from being accessed again, * nor does it kill the process. This is extremely rare and one of the * potential causes is that the page state has been changed due to * underlying race condition. This is the most severe outcomes. * - * MF_FAILED - The m-f() handler marks the page as PG_hwpoisoned'ed. + * MF_FAILED - The m-f() handler marks the page as PG_hwpoison'ed. * It should have killed the process, but it can't isolate the page, * due to conditions such as extra pin, unmap failure, etc. Accessing * the page again may trigger another MCE and the process will be killed * by the m-f() handler immediately. * - * MF_DELAYED - The m-f() handler marks the page as PG_hwpoisoned'ed. - * The page is unmapped, and is removed from the LRU or file mapping. - * An attempt to access the page again will trigger page fault and the - * PF handler will kill the process. + * MF_DELAYED - The m-f() handler marks the page as PG_hwpoison'ed. + * It means the page was unmapped and partially isolated (e.g. removed from + * file mapping or the LRU) but full cleanup is deferred (e.g. the metadata + * for the memory, as in struct page/folio, is still referenced). Any + * further access to the page will result in the process being killed. * - * MF_RECOVERED - The m-f() handler marks the page as PG_hwpoisoned'ed. + * MF_RECOVERED - The m-f() handler marks the page as PG_hwpoison'ed. * The page has been completely isolated, that is, unmapped, taken out of * the buddy system, or hole-punched out of the file mapping. */ -- 2.55.0.766.g2966f0265a-goog