[PATCH v4 2/2] perf tools: Add documentation for 'perf irq' command

[Bixuan Cui]

Add documentation for 'perf irq' command.

Signed-off-by: Bixuan Cui <cuibixuan@xxxxxxxxxx>
---
 tools/perf/Documentation/perf-irq.txt | 47 +++++++++++++++++++++++++++
 tools/perf/command-list.txt           |  1 +
 2 files changed, 48 insertions(+)
 create mode 100644 tools/perf/Documentation/perf-irq.txt

diff --git a/tools/perf/Documentation/perf-irq.txt b/tools/perf/Documentation/perf-irq.txt
new file mode 100644
index 000000000000..8f1c466c3d6b
--- /dev/null
+++ b/tools/perf/Documentation/perf-irq.txt
@@ -0,0 +1,47 @@
+perf-irq(1)
+=============
+
+NAME
+----
+perf-irq - Tool to trace/measure hardware interrupts
+
+SYNOPSIS
+--------
+[verse]
+'perf irq' [<options>] {record|report}
+
+DESCRIPTION
+-----------
+There are several variants of 'perf irq':
+
+  'perf irq record <command>' to record the irq handler events
+  of an arbitrary workload.
+
+  'perf irq report' to calculate the time consumed by each
+   hardware interrupt processing function.
+
+    Example usage:
+        perf irq record -- sleep 1
+        perf irq report
+
+   By default it shows the individual irq events, including the irq name,
+   cpu(execute the hardware interrupt processing function), time consumed,
+   entry time and exit time for the each hardware irq:
+
+   -------------------------------------------------------------------------------------------------------------------------------------------
+     Irq name         |  CPU   | Time consume us | Handler entry time | Handler exit time
+   -------------------------------------------------------------------------------------------------------------------------------------------
+     enp2s0f2-tx-0    | [0006] |      0.000001 s |   6631263.313329 s |   6631263.313330 s
+     megasas          | [0013] |      0.000003 s |   6631263.209564 s |   6631263.209567 s
+     acpi             | [0016] |      0.000018 s |   6631263.085787 s |   6631263.085805 s
+
+
+OPTIONS for 'perf irq'
+----------------------------
+
+--cpus::
+	Show just entries with activities for the given CPUs.
+
+SEE ALSO
+--------
+linkperf:perf-record[1]
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index bc6c585f74fc..c5224ea3ac71 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -26,6 +26,7 @@ perf-report			mainporcelain common
 perf-sched			mainporcelain common
 perf-script			mainporcelain common
 perf-stat			mainporcelain common
+perf-irq			mainporcelain common
 perf-test			mainporcelain common
 perf-timechart			mainporcelain common
 perf-top			mainporcelain common
-- 
2.17.1