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Message-Id: <1518845990-20733-13-git-send-email-changbin.du@intel.com>
Date: Sat, 17 Feb 2018 13:39:45 +0800
From: changbin.du@...el.com
To: corbet@....net, rostedt@...dmis.org
Cc: mingo@...nel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...el.com>
Subject: [PATCH 12/17] trace doc: convert trace/events-nmi.txt to rst format
From: Changbin Du <changbin.du@...el.com>
This converts the plain text documentation to reStructuredText format and
add it into Sphinx TOC tree. No essential content change.
Cc: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Changbin Du <changbin.du@...el.com>
---
Documentation/trace/events-nmi.rst | 45 ++++++++++++++++++++++++++++++++++++++
Documentation/trace/events-nmi.txt | 43 ------------------------------------
Documentation/trace/index.rst | 1 +
3 files changed, 46 insertions(+), 43 deletions(-)
create mode 100644 Documentation/trace/events-nmi.rst
delete mode 100644 Documentation/trace/events-nmi.txt
diff --git a/Documentation/trace/events-nmi.rst b/Documentation/trace/events-nmi.rst
new file mode 100644
index 0000000..9e0a728
--- /dev/null
+++ b/Documentation/trace/events-nmi.rst
@@ -0,0 +1,45 @@
+================
+NMI Trace Events
+================
+
+These events normally show up here:
+
+ /sys/kernel/debug/tracing/events/nmi
+
+
+nmi_handler
+-----------
+
+You might want to use this tracepoint if you suspect that your
+NMI handlers are hogging large amounts of CPU time. The kernel
+will warn if it sees long-running handlers::
+
+ INFO: NMI handler took too long to run: 9.207 msecs
+
+and this tracepoint will allow you to drill down and get some
+more details.
+
+Let's say you suspect that perf_event_nmi_handler() is causing
+you some problems and you only want to trace that handler
+specifically. You need to find its address::
+
+ $ grep perf_event_nmi_handler /proc/kallsyms
+ ffffffff81625600 t perf_event_nmi_handler
+
+Let's also say you are only interested in when that function is
+really hogging a lot of CPU time, like a millisecond at a time.
+Note that the kernel's output is in milliseconds, but the input
+to the filter is in nanoseconds! You can filter on 'delta_ns'::
+
+ cd /sys/kernel/debug/tracing/events/nmi/nmi_handler
+ echo 'handler==0xffffffff81625600 && delta_ns>1000000' > filter
+ echo 1 > enable
+
+Your output would then look like::
+
+ $ cat /sys/kernel/debug/tracing/trace_pipe
+ <idle>-0 [000] d.h3 505.397558: nmi_handler: perf_event_nmi_handler() delta_ns: 3236765 handled: 1
+ <idle>-0 [000] d.h3 505.805893: nmi_handler: perf_event_nmi_handler() delta_ns: 3174234 handled: 1
+ <idle>-0 [000] d.h3 506.158206: nmi_handler: perf_event_nmi_handler() delta_ns: 3084642 handled: 1
+ <idle>-0 [000] d.h3 506.334346: nmi_handler: perf_event_nmi_handler() delta_ns: 3080351 handled: 1
+
diff --git a/Documentation/trace/events-nmi.txt b/Documentation/trace/events-nmi.txt
deleted file mode 100644
index c03c8c8..0000000
--- a/Documentation/trace/events-nmi.txt
+++ /dev/null
@@ -1,43 +0,0 @@
-NMI Trace Events
-
-These events normally show up here:
-
- /sys/kernel/debug/tracing/events/nmi
-
---
-
-nmi_handler:
-
-You might want to use this tracepoint if you suspect that your
-NMI handlers are hogging large amounts of CPU time. The kernel
-will warn if it sees long-running handlers:
-
- INFO: NMI handler took too long to run: 9.207 msecs
-
-and this tracepoint will allow you to drill down and get some
-more details.
-
-Let's say you suspect that perf_event_nmi_handler() is causing
-you some problems and you only want to trace that handler
-specifically. You need to find its address:
-
- $ grep perf_event_nmi_handler /proc/kallsyms
- ffffffff81625600 t perf_event_nmi_handler
-
-Let's also say you are only interested in when that function is
-really hogging a lot of CPU time, like a millisecond at a time.
-Note that the kernel's output is in milliseconds, but the input
-to the filter is in nanoseconds! You can filter on 'delta_ns':
-
-cd /sys/kernel/debug/tracing/events/nmi/nmi_handler
-echo 'handler==0xffffffff81625600 && delta_ns>1000000' > filter
-echo 1 > enable
-
-Your output would then look like:
-
-$ cat /sys/kernel/debug/tracing/trace_pipe
-<idle>-0 [000] d.h3 505.397558: nmi_handler: perf_event_nmi_handler() delta_ns: 3236765 handled: 1
-<idle>-0 [000] d.h3 505.805893: nmi_handler: perf_event_nmi_handler() delta_ns: 3174234 handled: 1
-<idle>-0 [000] d.h3 506.158206: nmi_handler: perf_event_nmi_handler() delta_ns: 3084642 handled: 1
-<idle>-0 [000] d.h3 506.334346: nmi_handler: perf_event_nmi_handler() delta_ns: 3080351 handled: 1
-
diff --git a/Documentation/trace/index.rst b/Documentation/trace/index.rst
index 309c9c5..f4a8fbc 100644
--- a/Documentation/trace/index.rst
+++ b/Documentation/trace/index.rst
@@ -15,3 +15,4 @@ Linux Tracing Technologies
events
events-kmem
events-power
+ events-nmi
--
2.7.4
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