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Received: from authenticated user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94.2) (envelope-from ) id 1vmuuJ-0046XU-Lw; Mon, 02 Feb 2026 14:28:04 +0000 From: Breno Leitao Subject: [PATCH v2 0/2] vmcoreinfo: Expose hardware error recovery statistics via sysfs Date: Mon, 02 Feb 2026 06:27:38 -0800 Message-Id: <20260202-vmcoreinfo_sysfs-v2-0-8f3b5308b894@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAFu0gGkC/33NQQqDMBCF4auEWZtigtXqqvcoUjTO6BSalIwNF fHuRbvv8sHP91YQjIwCjVohYmLh4KFRNlPgps6PqHmARoHNbZkbW+v0dCEiewp3WYREExXlpaq r2g1nyBS8IhJ/DvLW/ra8+we6eXf2YmKZQ1yOz2T27g+fjDbalIUzhIYwr64D9tz5U4gjtNu2f QEZ/HDywwAAAA== X-Change-ID: 20260129-vmcoreinfo_sysfs-ff4687979cd5 To: akpm@linux-foundation.org, bhe@redhat.com Cc: linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, dyoung@redhat.com, tony.luck@intel.com, xueshuai@linux.alibaba.com, vgoyal@redhat.com, zhiquan1.li@intel.com, olja@meta.com, Breno Leitao , kernel-team@meta.com X-Mailer: b4 0.15-dev-f4305 X-Developer-Signature: v=1; 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a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Debian-User: leitao X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260202_062822_323850_5BA141A4 X-CRM114-Status: GOOD ( 10.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The kernel already tracks recoverable hardware errors (CPU, memory, PCI, CXL, etc.) in the hwerr_data array for vmcoreinfo crash dump analysis. However, this data is only accessible after a crash. This series adds a sysfs directory at /sys/kernel/hwerr_recovery_stats/ to expose these statistics at runtime, allowing monitoring tools to track hardware health without requiring a kernel crash. The directory contains one file per error subsystem: /sys/kernel/hwerr_recovery_stats/{cpu, memory, pci, cxl, others} Each file contains a single integer representing the error count. This is useful for: - Proactive detection of failing hardware components - Time-series tracking of recoverable errors - System health monitoring in cloud environments To: akpm@linux-foundation.org Cc: kexec@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-acpi@vger.kernel.org To: bhe@redhat.com Cc: linux-kernel@vger.kernel.org Cc: dyoung@redhat.com Cc: tony.luck@intel.com Cc: xueshuai@linux.alibaba.com Cc: vgoyal@redhat.com Cc: zhiquan1.li@intel.com Cc: olja@meta.com Signed-off-by: Breno Leitao --- Changes in v2: - Renamed vmcore_stats to hwerr_stats - Separate each subsystem in multiple sysfs entries, one per file - Link to v1: https://patch.msgid.link/20260129-vmcoreinfo_sysfs-v1-1-164c1fe1fe07@debian.org --- Breno Leitao (2): vmcoreinfo: expose hardware error recovery statistics via sysfs docs: add ABI documentation for /sys/kernel/hwerr_recovery_stats/ .../ABI/testing/sysfs-kernel-hwerr_recovery_stats | 47 ++++++++++++++++++ Documentation/driver-api/hw-recoverable-errors.rst | 3 +- kernel/vmcore_info.c | 55 ++++++++++++++++++++++ 3 files changed, 104 insertions(+), 1 deletion(-) --- base-commit: 4d310797262f0ddf129e76c2aad2b950adaf1fda change-id: 20260129-vmcoreinfo_sysfs-ff4687979cd5 Best regards, -- Breno Leitao