tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel/rcu/tree_stall: add /sys/kernel/rcu_stall_count

Expose a simple counter to userspace for monitoring tools.

Link: https://lkml.kernel.org/r/20250504180831.4190860-3-max.kellermann@ionos.com
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Cc: Core Minyard <cminyard@mvista.com>
Cc: Doug Anderson <dianders@chromium.org>
Cc: Joel Granados <joel.granados@kernel.org>
Cc: Kees Cook <kees@kernel.org>
Cc: Song Liu <song@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Max Kellermann and committed by
Andrew Morton 2536c5c7 aaf05e96

+6
+6
Documentation/ABI/testing/sysfs-kernel-rcu_stall_count
··· 1 + What: /sys/kernel/rcu_stall_count 2 + Date: May 2025 3 + KernelVersion: 6.16 4 + Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> 5 + Description: 6 + Shows how many times the system has detected an RCU stall since last boot.