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AJvYcCXfI6ODViObWft5M38cESN6hApzBXvmnLBhL1cCSLIQxabtH0vw6ZiGGy8darfrDM6bwRLSgD8/2A==@kvack.org X-Gm-Message-State: AOJu0YwUO6giw4DsEw4vEcw/dE1wVsaFwnH+Pr7qqZ2lbAH50sdei8jx GsnKZsPR8rW4rLIqdYe732DH1XkX8NP/izX1EzPC1od0minbZ+hZinbaCBr8ZMnEYkLaDg31QEx kcbdChw== X-Received: from pfx30.prod.google.com ([2002:a05:6a00:a45e:b0:82a:6bbe:c0dd]) (user=wyihan job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:6c9e:b0:821:81ef:5de8 with SMTP id d2e1a72fcca58-82d0da4680bmr20598726b3a.12.1775669171123; Wed, 08 Apr 2026 10:26:11 -0700 (PDT) Date: Wed, 08 Apr 2026 17:24:42 +0000 In-Reply-To: <20260408-memory-failure-mf-delayed-fix-rfc-v3-v3-0-718f45eb7c75@google.com> Mime-Version: 1.0 References: <20260408-memory-failure-mf-delayed-fix-rfc-v3-v3-0-718f45eb7c75@google.com> X-Developer-Key: i=wyihan@google.com; a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1775669168; l=2390; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=tCUAER8XAOCDEwqKOePrak2HLKwWUrDfij0Iac7Dp58=; b=buXgD0W2k9Th2g3W9/TO/6Ez7VzKspI14jx1Q91h6/d29lN7r5B3H1yOm0SeG+gIqR4hNTHhQ 1k5jFUJpx39BlVEg10kkWolRIctuvMivfofoisa1Uv7IEef0KJmZW7e X-Mailer: b4 0.14.3 Message-ID: <20260408-memory-failure-mf-delayed-fix-rfc-v3-v3-1-718f45eb7c75@google.com> Subject: [PATCH RFC v3 1/7] 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 , Lorenzo Stoakes , "Liam R. Howlett" , 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 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 Content-Type: text/plain; charset="utf-8" X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 732EF100010 X-Stat-Signature: xtesuu8n15sssgnnazw7y51pccn8193o X-Rspam-User: X-HE-Tag: 1775669172-166104 X-HE-Meta: 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 7rzrW4wq 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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). 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 ee42d4361309..2e53b3024391 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -849,24 +849,25 @@ 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. */ -- 2.53.0.1213.gd9a14994de-goog