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kernel/rcu/tree_stall: add /sys/kernel/rcu_stall_count

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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>
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Max Kellermann 2025-05-04 20:08:31 +02:00 committed by Andrew Morton
parent aaf05e96e9
commit 2536c5c7d6
1 changed files with 6 additions and 0 deletions
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Documentation/ABI/testing/sysfs-kernel-rcu_stall_count Normal file
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What: /sys/kernel/rcu_stall_count
Date: May 2025
KernelVersion: 6.16
Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Description:
Shows how many times the system has detected an RCU stall since last boot.