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a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1789677906; l=2541; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=VByVeEjI4LUQrNUSvfcdQ/qkaw2W/Fj0TZtQKNhauZ4=; b=26Q9nOB/cKS3IbZahb3B67Qv7bStXKlTukEhrVZ3ZTwAxnSeS1vUPLqyUMVeJYRB0EYtlJR7z gJoC/MAIdDNALDdHkcigEox0KlId9ndvnjep7WAdkFOdJ368ZU4Ehy+ X-Mailer: b4 0.14.3 Message-ID: <20260917-memory-failure-mf-delayed-fix-v6-1-4b00856b5364@google.com> Subject: [PATCH v6 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-Stat-Signature: 9kns4jjds5ingnnj111oea3rfmp1iwhm X-Rspamd-Queue-Id: 0E8FAA000B X-Rspamd-Server: rspam07 X-HE-Tag: 1789677909-143776 X-HE-Meta: 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 /TuSg+QT 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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. */ -- 2.55.0.1082.g2b9226bbc0-goog