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Message-ID: <20221123120238.1904-1-thunder.leizhen@huawei.com>
Date: Wed, 23 Nov 2022 20:02:38 +0800
From: Zhen Lei <thunder.leizhen@...wei.com>
To: "Paul E . McKenney" <paulmck@...nel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Neeraj Upadhyay <quic_neeraju@...cinc.com>,
"Josh Triplett" <josh@...htriplett.org>,
Steven Rostedt <rostedt@...dmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Lai Jiangshan <jiangshanlai@...il.com>,
Joel Fernandes <joel@...lfernandes.org>, <rcu@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: Zhen Lei <thunder.leizhen@...wei.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
<linux-next@...r.kernel.org>
Subject: [PATCH v2] doc: Fix htmldocs build warnings of stallwarn.rst
Documentation/RCU/stallwarn.rst:
401: WARNING: Literal block expected; none found.
428: WARNING: Literal block expected; none found.
445: WARNING: Literal block expected; none found.
459: WARNING: Literal block expected; none found.
468: WARNING: Literal block expected; none found.
The literal block need to be indented, so add two spaces to each line.
In addition, ':', which is used as a boundary in the literal block, is
replaced by '|'.
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
Documentation/RCU/stallwarn.rst | 56 ++++++++++++++++++---------------
1 file changed, 30 insertions(+), 26 deletions(-)
v1 --> v2:
For the case that both colons need to be deleted, change "::" to expanded
form or partially minimized form.
diff --git a/Documentation/RCU/stallwarn.rst b/Documentation/RCU/stallwarn.rst
index c1e92dfef40d501..f15b766d39b8d98 100644
--- a/Documentation/RCU/stallwarn.rst
+++ b/Documentation/RCU/stallwarn.rst
@@ -398,9 +398,9 @@ In kernels built with CONFIG_RCU_CPU_STALL_CPUTIME=y or booted with
rcupdate.rcu_cpu_stall_cputime=1, the following additional information
is supplied with each RCU CPU stall warning::
-rcu: hardirqs softirqs csw/system
-rcu: number: 624 45 0
-rcu: cputime: 69 1 2425 ==> 2500(ms)
+ rcu: hardirqs softirqs csw/system
+ rcu: number: 624 45 0
+ rcu: cputime: 69 1 2425 ==> 2500(ms)
These statistics are collected during the sampling period. The values
in row "number:" are the number of hard interrupts, number of soft
@@ -412,22 +412,24 @@ in milliseconds. Because user-mode tasks normally do not cause RCU CPU
stalls, these tasks are typically kernel tasks, which is why only the
system CPU time are considered.
-The sampling period is shown as follows:
-:<------------first timeout---------->:<-----second timeout----->:
-:<--half timeout-->:<--half timeout-->: :
-: :<--first period-->: :
-: :<-----------second sampling period---------->:
-: : : :
-: snapshot time point 1st-stall 2nd-stall
+The sampling period is shown as follows::
+ |<------------first timeout---------->|<-----second timeout----->|
+ |<--half timeout-->|<--half timeout-->| |
+ | |<--first period-->| |
+ | |<-----------second sampling period---------->|
+ | | | |
+ | snapshot time point 1st-stall 2nd-stall
The following describes four typical scenarios:
-1. A CPU looping with interrupts disabled.::
+1. A CPU looping with interrupts disabled.
- rcu: hardirqs softirqs csw/system
- rcu: number: 0 0 0
- rcu: cputime: 0 0 0 ==> 2500(ms)
+ ::
+
+ rcu: hardirqs softirqs csw/system
+ rcu: number: 0 0 0
+ rcu: cputime: 0 0 0 ==> 2500(ms)
Because interrupts have been disabled throughout the measurement
interval, there are no interrupts and no context switches.
@@ -440,11 +442,11 @@ The following describes four typical scenarios:
This is similar to the previous example, but with non-zero number of
and CPU time consumed by hard interrupts, along with non-zero CPU
- time consumed by in-kernel execution.::
+ time consumed by in-kernel execution. ::
- rcu: hardirqs softirqs csw/system
- rcu: number: 624 0 0
- rcu: cputime: 49 0 2446 ==> 2500(ms)
+ rcu: hardirqs softirqs csw/system
+ rcu: number: 624 0 0
+ rcu: cputime: 49 0 2446 ==> 2500(ms)
The fact that there are zero softirqs gives a hint that these were
disabled, perhaps via local_bh_disable(). It is of course possible
@@ -454,20 +456,22 @@ The following describes four typical scenarios:
3. A CPU looping with preemption disabled.
- Here, only the number of context switches is zero.::
+ Here, only the number of context switches is zero. ::
- rcu: hardirqs softirqs csw/system
- rcu: number: 624 45 0
- rcu: cputime: 69 1 2425 ==> 2500(ms)
+ rcu: hardirqs softirqs csw/system
+ rcu: number: 624 45 0
+ rcu: cputime: 69 1 2425 ==> 2500(ms)
This situation hints that the stalled CPU was looping with preemption
disabled.
-4. No looping, but massive hard and soft interrupts.::
+4. No looping, but massive hard and soft interrupts.
+
+ ::
- rcu: hardirqs softirqs csw/system
- rcu: number: xx xx 0
- rcu: cputime: xx xx 0 ==> 2500(ms)
+ rcu: hardirqs softirqs csw/system
+ rcu: number: xx xx 0
+ rcu: cputime: xx xx 0 ==> 2500(ms)
Here, the number and CPU time of hard interrupts are all non-zero,
but the number of context switches and the in-kernel CPU time consumed
--
2.25.1
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