Messages in this thread Patch in this message | | | From | Jonathan Corbet <> | Subject | Re: [PATCH] Documentation/sysctl: document max_rcu_stall_to_panic | Date | Thu, 28 Apr 2022 12:39:54 -0600 |
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Joel Savitz <jsavitz@redhat.com> writes:
> Friendly ping.
This was waiting for an ack from an RCU person. Looking now, though, I see that you didn't copy any RCU people. Adding Paul and the author of the patch you reference (and appending patch below).
Thanks,
jon
Joel Savitz <jsavitz@redhat.com> (March 24) (kernel lwn) Subject: [PATCH] Documentation/sysctl: document max_rcu_stall_to_panic To: linux-kernel@vger.kernel.org Cc: Joel Savitz <jsavitz@redhat.com>, Jonathan Corbet <corbet@lwn.net>, Andrew Morton <akpm@linux-foundation.org>, Huang Ying <ying.huang@intel.com>, Eric Biggers <ebiggers@google.com>, Dominik Brodowski <linux@dominikbrodowski.net>, Mauro Carvalho Chehab <mchehab+huawei@kernel.org>, Rasmus Villemoes <linux@rasmusvillemoes.dk>, "Jason A. Donenfeld" <Jason@zx2c4.com>, Daniel Borkmann <daniel@iogearbox.net>, Rob Herring <robh@kernel.org>, Wang Qing <wangqing@vivo.com>, linux-doc@vger.kernel.org Date: Thu, 24 Mar 2022 18:11:56 -0400
commit dfe564045c65 ("rcu: Panic after fixed number of stalls") introduced a new systctl but no accompanying documentation.
Add a simple entry to the documentation.
Signed-off-by: Joel Savitz <jsavitz@redhat.com> --- Documentation/admin-guide/sysctl/kernel.rst | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 803c60bf21d3..4e48139b9a34 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -781,6 +781,13 @@ is useful to define the root cause of RCU stalls using a vmcore. 1 panic() after printing RCU stall messages. = ============================================================
+max_rcu_stall_to_panic +====================== + +When ``panic_on_rcu_stall`` is set to 1, this value determines the +number of times that RCU can stall before panic() is called. + +When ``panic_on_rcu_stall`` is set to 0, this value is has no effect.
perf_cpu_time_max_percent =========================
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