kernel / tools / power / pm-graph / sleepgraph.8

.TH SLEEPGRAPH 8
.SH NAME
sleepgraph \- Suspend/Resume timing analysis
.SH SYNOPSIS
.ft B
.B sleepgraph
.RB [ OPTIONS ]
.RB [ COMMAND ]
.SH DESCRIPTION
\fBsleepgraph \fP is designed to assist kernel and OS developers
in optimizing their linux stack's suspend/resume time. Using a kernel
image built with a few extra options enabled, the tool will execute a
suspend and capture dmesg and ftrace data until resume is complete.
This data is transformed into a device timeline and an optional
callgraph to give a detailed view of which devices/subsystems are
taking the most time in suspend/resume.
.PP
If no specific command is given, the default behavior is to initiate
a suspend/resume.
.PP
Generates output files in subdirectory: suspend-yymmdd-HHMMSS
   html timeline   :     <hostname>_<mode>.html
   raw dmesg file  :     <hostname>_<mode>_dmesg.txt
   raw ftrace file :     <hostname>_<mode>_ftrace.txt
.SH OPTIONS
.TP
\fB-h\fR
Print the help text.
.TP
\fB-v\fR
Print the current tool version.
.TP
\fB-verbose\fR
Print extra information during execution and analysis.
.TP
\fB-config \fIfile\fR
Pull arguments and config options from a file.
.TP
\fB-m \fImode\fR
Mode to initiate for suspend e.g. standby, freeze, mem (default: mem).
.TP
\fB-o \fIname\fR
Overrides the output subdirectory name when running a new test.
Use {date}, {time}, {hostname} for current values.
.sp
e.g. suspend-{hostname}-{date}-{time}
.TP
\fB-rtcwake \fIt\fR | off
Use rtcwake to autoresume after \fIt\fR seconds (default: 15). Set t to "off" to
disable rtcwake and require a user keypress to resume.
.TP
\fB-addlogs\fR
Add the dmesg and ftrace logs to the html output. They will be viewable by
clicking buttons in the timeline.
.TP
\fB-turbostat\fR
Use turbostat to execute the command in freeze mode (default: disabled). This
will provide turbostat output in the log which will tell you which actual
power modes were entered.
.TP
\fB-result \fIfile\fR
Export a results table to a text file for parsing.
.TP
\fB-sync\fR
Sync the filesystems before starting the test. This reduces the size of
the sys_sync call which happens in the suspend_prepare phase.
.TP
\fB-rs \fIenable/disable\fR
During test, enable/disable runtime suspend for all devices. The test is delayed
by 5 seconds to allow runtime suspend changes to occur. The settings are restored
after the test is complete.
.TP
\fB-display \fIon/off/standby/suspend\fR
Switch the display to the requested mode for the test using the xset command.
This helps maintain the consistency of test data for better comparison.
.TP
\fB-skiphtml\fR
Run the test and capture the trace logs, but skip the timeline generation.

.SS "advanced"
.TP
\fB-gzip\fR
Gzip the trace and dmesg logs to save space. The tool can also read in gzipped
logs for processing.
.TP
\fB-cmd \fIstr\fR
Run the timeline over a custom suspend command, e.g. pm-suspend. By default
the tool forces suspend via /sys/power/state so this allows testing over
an OS's official suspend method. The output file will change to
hostname_command.html and will autodetect which suspend mode was triggered.
.TP
\fB-filter \fI"d1,d2,..."\fR
Filter out all but these device callbacks. These strings can be device names
or module names. e.g. 0000:00:02.0, ata5, i915, usb, etc.
.TP
\fB-mindev \fIt\fR
Discard all device callbacks shorter than \fIt\fR milliseconds (default: 0.0).
This reduces the html file size as there can be many tiny callbacks which are barely
visible. The value is a float: e.g. 0.001 represents 1 us.
.TP
\fB-proc\fR
Add usermode process info into the timeline (default: disabled).
.TP
\fB-dev\fR
Add kernel source calls and threads to the timeline (default: disabled).
.TP
\fB-x2\fR
Run two suspend/resumes back to back (default: disabled).
.TP
\fB-x2delay \fIt\fR
Include \fIt\fR ms delay between multiple test runs (default: 0 ms).
.TP
\fB-predelay \fIt\fR
Include \fIt\fR ms delay before 1st suspend (default: 0 ms).
.TP
\fB-postdelay \fIt\fR
Include \fIt\fR ms delay after last resume (default: 0 ms).
.TP
\fB-multi \fIn d\fR
Execute \fIn\fR consecutive tests at \fId\fR seconds intervals. The outputs will
be created in a new subdirectory with a summary page: suspend-xN-{date}-{time}.

.SS "ftrace debug"
.TP
\fB-f\fR
Use ftrace to create device callgraphs (default: disabled). This can produce
very large outputs, i.e. 10MB - 100MB.
.TP
\fB-ftop\fR
Use ftrace on the top level call: "suspend_devices_and_enter" only (default: disabled).
This option implies -f and creates a single callgraph covering all of suspend/resume.
.TP
\fB-maxdepth \fIlevel\fR
limit the callgraph trace depth to \fIlevel\fR (default: 0=all). This is
the best way to limit the output size when using callgraphs via -f.
.TP
\fB-expandcg\fR
pre-expand the callgraph data in the html output (default: disabled)
.TP
\fB-fadd \fIfile\fR
Add functions to be graphed in the timeline from a list in a text file
.TP
\fB-mincg \fIt\fR
Discard all callgraphs shorter than \fIt\fR milliseconds (default: 0.0).
This reduces the html file size as there can be many tiny callgraphs
which are barely visible in the timeline.
The value is a float: e.g. 0.001 represents 1 us.
.TP
\fB-cgfilter \fI"func1,func2,..."\fR
Reduce callgraph output in the timeline by limiting it certain devices. The
argument can be a single device name or a comma delimited list.
(default: none)
.TP
\fB-cgskip \fIfile\fR
Reduce callgraph timeline size by skipping over uninteresting functions
in the trace, e.g. printk or console_unlock. The functions listed
in this file will show up as empty leaves in the callgraph with only the start/end
times displayed. cgskip.txt is used automatically if found in the path, so
use "off" to disable completely (default: cgskip.txt)
.TP
\fB-cgphase \fIp\fR
Only show callgraph data for phase \fIp\fR (e.g. suspend_late).
.TP
\fB-cgtest \fIn\fR
In an x2 run, only show callgraph data for test \fIn\fR (e.g. 0 or 1).
.TP
\fB-timeprec \fIn\fR
Number of significant digits in timestamps (0:S, [3:ms], 6:us).
.TP
\fB-bufsize \fIN\fR
Set trace buffer size to N kilo-bytes (default: all of free memory up to 3GB)

.SH COMMANDS
.TP
\fB-summary \fIindir\fR
Create a summary page of all tests in \fIindir\fR. Creates summary.html
in the current folder. The output page is a table of tests with
suspend and resume values sorted by suspend mode, host, and kernel.
Includes test averages by mode and links to the test html files.
Use -genhtml to include tests with missing html.
.TP
\fB-modes\fR
List available suspend modes.
.TP
\fB-status\fR
Test to see if the system is able to run this tool. Use this along
with any options you intend to use to see if they will work.
.TP
\fB-fpdt\fR
Print out the contents of the ACPI Firmware Performance Data Table.
.TP
\fB-battery\fR
Print out battery status and current charge.
.TP
\fB-wifi\fR
Print out wifi status and connection details.
.TP
\fB-xon/-xoff/-xstandby/-xsuspend\fR
Test xset by attempting to switch the display to the given mode. This
is the same command which will be issued by \fB-display \fImode\fR.
.TP
\fB-xstat\fR
Get the current DPMS display mode.
.TP
\fB-sysinfo\fR
Print out system info extracted from BIOS. Reads /dev/mem directly instead of going through dmidecode.
.TP
\fB-devinfo\fR
Print out the pm settings of all devices which support runtime suspend.
.TP
\fB-flist\fR
Print the list of ftrace functions currently being captured. Functions
that are not available as symbols in the current kernel are shown in red.
By default, the tool traces a list of important suspend/resume functions
in order to better fill out the timeline. If the user has added their own
with -fadd they will also be checked.
.TP
\fB-flistall\fR
Print all ftrace functions capable of being captured. These are all the
possible values you can add to trace via the -fadd argument.
.SS "rebuild"
.TP
\fB-ftrace \fIfile\fR
Create HTML output from an existing ftrace file.
.TP
\fB-dmesg \fIfile\fR
Create HTML output from an existing dmesg file.

.SH EXAMPLES
.SS "simple commands"
Check which suspend modes are currently supported.
.IP
\f(CW$ sleepgraph -modes\fR
.PP
Read the Firmware Performance Data Table (FPDT)
.IP
\f(CW$ sudo sleepgraph -fpdt\fR
.PP
Print out the current USB power topology
.IP
\f(CW$ sleepgraph -usbtopo
.PP
Verify that you can run a command with a set of arguments
.IP
\f(CW$ sudo sleepgraph -f -rtcwake 30 -status
.PP
Generate a summary of all timelines in a particular folder.
.IP
\f(CW$ sleepgraph -summary ~/workspace/myresults/\fR
.PP

.SS "capturing basic timelines"
Execute a mem suspend with a 15 second wakeup. Include the logs in the html.
.IP
\f(CW$ sudo sleepgraph -rtcwake 15 -addlogs\fR
.PP
Execute a standby with a 15 second wakeup. Change the output folder name.
.IP
\f(CW$ sudo sleepgraph -m standby -rtcwake 15 -o "standby-{host}-{date}-{time}"\fR
.PP
Execute a freeze with no wakeup (require keypress). Change output folder name.
.IP
\f(CW$ sudo sleepgraph -m freeze -rtcwake off -o "freeze-{hostname}-{date}-{time}"\fR
.PP

.SS "capturing advanced timelines"
Execute a suspend & include dev mode source calls, limit callbacks to 5ms or larger.
.IP
\f(CW$ sudo sleepgraph -m mem -rtcwake 15 -dev -mindev 5\fR
.PP
Run two suspends back to back, include a 500ms delay before, after, and in between runs.
.IP
\f(CW$ sudo sleepgraph -m mem -rtcwake 15 -x2 -predelay 500 -x2delay 500 -postdelay 500\fR
.PP
Do a batch run of 10 freezes with 30 seconds delay between runs.
.IP
\f(CW$ sudo sleepgraph -m freeze -rtcwake 15 -multi 10 30\fR
.PP
Execute a suspend using a custom command.
.IP
\f(CW$ sudo sleepgraph -cmd "echo mem > /sys/power/state" -rtcwake 15\fR
.PP

.SS "adding callgraph data"
Add device callgraphs. Limit the trace depth and only show callgraphs 10ms or larger.
.IP
\f(CW$ sudo sleepgraph -m mem -rtcwake 15 -f -maxdepth 5 -mincg 10\fR
.PP
Capture a full callgraph across all suspend, then filter the html by a single phase.
.IP
\f(CW$ sudo sleepgraph -m mem -rtcwake 15 -f\fR
.IP
\f(CW$ sleepgraph -dmesg host_mem_dmesg.txt -ftrace host_mem_ftrace.txt -f -cgphase resume
.PP

.SS "rebuild timeline from logs"
.PP
Rebuild the html from a previous run's logs, using the same options.
.IP
\f(CW$ sleepgraph -dmesg dmesg.txt -ftrace ftrace.txt -callgraph\fR
.PP
Rebuild the html with different options.
.IP
\f(CW$ sleepgraph -dmesg dmesg.txt -ftrace ftrace.txt -addlogs -srgap\fR

.SH "SEE ALSO"
dmesg(1)
.PP
.SH AUTHOR
.nf
Written by Todd Brandt <[e-mail]>