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Date: Thu, 14 Jan 2021 15:48:52 +0800
From: Bixuan Cui <cuibixuan@...wei.com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
<mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
<jolsa@...hat.com>, <namhyung@...nel.org>,
<linux-kernel@...r.kernel.org>
CC: <john.wanghui@...wei.com>
Subject: [PATCH v2 2/2] perf tools: Add documentation for 'perf irq' command
Add documentation for 'perf irq' command.
Signed-off-by: Bixuan Cui <cuibixuan@...wei.com>
---
tools/perf/Documentation/perf-irq.txt | 58 +++++++++++++++++++++++++++
tools/perf/command-list.txt | 1 +
2 files changed, 59 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..22709b6df62d
--- /dev/null
+++ b/tools/perf/Documentation/perf-irq.txt
@@ -0,0 +1,58 @@
+perf-irq(1)
+=============
+
+NAME
+----
+perf-irq - Tool to trace/measure hardware interrupts
+
+SYNOPSIS
+--------
+[verse]
+'perf irq' {record|report|script}
+
+DESCRIPTION
+-----------
+There are several variants of 'perf irq':
+
+ 'perf irq record <command>' to record the irq handler events
+ of an arbitrary workload.
+
+ 'perf irq script' to see a detailed trace of the workload that
+ was recorded (aliased to 'perf script' for now).
+
+ '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
+
+ -------------------------------------------------------------------------------------------------------------------------------------------
+ Irq name | CPU | Time consume us | Handler entry time | Handler exit time
+ -------------------------------------------------------------------------------------------------------------------------------------------
+ megasas | [0013] | 0.000003 s | 6631263.209564 s | 6631263.209567 s
+
+ -------------------------------------------------------------------------------------------------------------------------------------------
+ Irq name | CPU | Time consume us | Handler entry time | Handler exit time
+ -------------------------------------------------------------------------------------------------------------------------------------------
+ acpi | [0016] | 0.000018 s | 6631263.085787 s | 6631263.085805 s
+
+
+OPTIONS for 'perf irq report'
+----------------------------
+
+--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
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