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Max Kellermann
aaf05e96e9
Patch series "sysfs: add counters for lockups and stalls", v2. Commits9db89b4111("exit: Expose "oops_count" to sysfs") and8b05aa2633("panic: Expose "warn_count" to sysfs") added counters for oopses and warnings to sysfs, and these two patches do the same for hard/soft lockups and RCU stalls. All of these counters are useful for monitoring tools to detect whether the machine is healthy. If the kernel has experienced a lockup or a stall, it's probably due to a kernel bug, and I'd like to detect that quickly and easily. There is currently no way to detect that, other than parsing dmesg. Or observing indirect effects: such as certain tasks not responding, but then I need to observe all tasks, and it may take a while until these effects become visible/measurable. I'd rather be able to detect the primary cause more quickly, possibly before everything falls apart. This patch (of 2): There is /proc/sys/kernel/hung_task_detect_count, /sys/kernel/warn_count and /sys/kernel/oops_count but there is no userspace-accessible counter for hard/soft lockups. Having this is useful for monitoring tools. Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Max Kellermann <[email protected]> Cc: Cc: Core Minyard <[email protected]> Cc: Doug Anderson <[email protected]> Cc: Joel Granados <[email protected]> Cc: Song Liu <[email protected]> Cc: Kees Cook <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
8 lines
288 B
Plaintext
8 lines
288 B
Plaintext
What: /sys/kernel/softlockup_count
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Date: May 2025
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KernelVersion: 6.16
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Contact: Linux kernel mailing list <[email protected]>
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Description:
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Shows how many times the system has detected a soft lockup since last boot.
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Available only if CONFIG_SOFTLOCKUP_DETECTOR is enabled.
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