174 lines
5.5 KiB
Groff
174 lines
5.5 KiB
Groff
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.TH BOOTGRAPH 8
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.SH NAME
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bootgraph \- Kernel boot timing analysis
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.SH SYNOPSIS
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.ft B
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.B bootgraph
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.RB [ OPTIONS ]
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.RB [ COMMAND ]
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.SH DESCRIPTION
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\fBbootgraph \fP reads the dmesg log from kernel boot and
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creates an html representation of the initcall timeline. It graphs
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every module init call found, through both kernel and user modes. The
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timeline is split into two phases: kernel mode & user mode. kernel mode
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represents a single process run on a single cpu with serial init calls.
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Once user mode begins, the init process is called, and the init calls
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start working in parallel.
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.PP
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If no specific command is given, the tool reads the current dmesg log and
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outputs a new timeline.
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.PP
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The tool can also augment the timeline with ftrace data on custom target
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functions as well as full trace callgraphs.
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.PP
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Generates output files in subdirectory: boot-yymmdd-HHMMSS
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html timeline : <hostname>_boot.html
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raw dmesg file : <hostname>_boot_dmesg.txt
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raw ftrace file : <hostname>_boot_ftrace.txt
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.SH OPTIONS
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.TP
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\fB-h\fR
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Print this help text
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.TP
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\fB-v\fR
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Print the current tool version
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.TP
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\fB-addlogs\fR
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Add the dmesg log to the html output. It will be viewable by
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clicking a button in the timeline.
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.TP
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\fB-result \fIfile\fR
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Export a results table to a text file for parsing.
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.TP
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\fB-o \fIname\fR
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Overrides the output subdirectory name when running a new test.
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Use {date}, {time}, {hostname} for current values.
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.sp
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e.g. boot-{hostname}-{date}-{time}
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.SS "advanced"
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.TP
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\fB-f or -callgraph\fR
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Use ftrace to create initcall callgraphs (default: disabled). If -func
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is not used there will be one callgraph per initcall. This can produce
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very large outputs, i.e. 10MB - 100MB.
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.TP
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\fB-fstat\fR
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Use ftrace to add function detail (default: disabled)
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.TP
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\fB-maxdepth \fIlevel\fR
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limit the callgraph trace depth to \fIlevel\fR (default: 2). This is
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the best way to limit the output size when using -callgraph.
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.TP
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\fB-mincg \fIt\fR
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Discard all callgraphs shorter than \fIt\fR milliseconds (default: 0=all).
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This reduces the html file size as there can be many tiny callgraphs
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which are barely visible in the timeline.
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The value is a float: e.g. 0.001 represents 1 us.
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.TP
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\fB-cgfilter \fI"func1,func2,..."\fR
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Reduce callgraph output in the timeline by limiting it to a list of calls. The
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argument can be a single function name or a comma delimited list.
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(default: none)
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.TP
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\fB-cgskip \fIfile\fR
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Reduce callgraph output in the timeline by skipping over uninteresting
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functions in the trace, e.g. printk or console_unlock. The functions listed
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in this file will show up as empty leaves in the callgraph with only the start/end
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times displayed.
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(default: none)
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.TP
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\fB-timeprec \fIn\fR
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Number of significant digits in timestamps (0:S, 3:ms, [6:us])
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.TP
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\fB-expandcg\fR
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pre-expand the callgraph data in the html output (default: disabled)
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.TP
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\fB-func \fI"func1,func2,..."\fR
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Instead of tracing each initcall, trace a custom list of functions (default: do_one_initcall)
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.TP
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\fB-reboot\fR
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Reboot the machine and generate a new timeline automatically. Works in 4 steps.
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1. updates grub with the required kernel parameters
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2. installs a cron job which re-runs the tool after reboot
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3. reboots the system
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4. after startup, extracts the data and generates the timeline
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.TP
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\fB-manual\fR
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Show the requirements to generate a new timeline manually. Requires 3 steps.
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1. append the string to the kernel command line via your native boot manager.
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2. reboot the system
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3. after startup, re-run the tool with the same arguments and no command
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.SH COMMANDS
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.SS "rebuild"
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.TP
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\fB-dmesg \fIfile\fR
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Create HTML output from an existing dmesg file.
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.TP
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\fB-ftrace \fIfile\fR
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Create HTML output from an existing ftrace file (used with -dmesg).
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.SS "other"
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.TP
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\fB-flistall\fR
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Print all ftrace functions capable of being captured. These are all the
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possible values you can add to trace via the -func argument.
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.TP
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\fB-sysinfo\fR
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Print out system info extracted from BIOS. Reads /dev/mem directly instead of going through dmidecode.
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.SH EXAMPLES
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Create a timeline using the current dmesg log.
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.IP
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\f(CW$ bootgraph\fR
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.PP
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Create a timeline using the current dmesg and ftrace log.
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.IP
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\f(CW$ bootgraph -callgraph\fR
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.PP
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Create a timeline using the current dmesg, add the log to the html and change the folder.
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.IP
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\f(CW$ bootgraph -addlogs -o "myboot-{date}-{time}"\fR
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.PP
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Capture a new boot timeline by automatically rebooting the machine.
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.IP
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\f(CW$ sudo bootgraph -reboot -addlogs -o "latest-{hostname)"\fR
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.PP
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Capture a new boot timeline with function trace data.
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.IP
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\f(CW$ sudo bootgraph -reboot -f\fR
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.PP
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Capture a new boot timeline with trace & callgraph data. Skip callgraphs smaller than 5ms.
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.IP
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\f(CW$ sudo bootgraph -reboot -callgraph -mincg 5\fR
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.PP
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Capture a new boot timeline with callgraph data over custom functions.
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.IP
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\f(CW$ sudo bootgraph -reboot -callgraph -func "acpi_ps_parse_aml,msleep"\fR
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.PP
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Capture a brand new boot timeline with manual reboot.
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.IP
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\f(CW$ sudo bootgraph -callgraph -manual\fR
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.IP
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\f(CW$ vi /etc/default/grub # add the CMDLINE string to your kernel params\fR
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.IP
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\f(CW$ sudo reboot # reboot the machine\fR
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.IP
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\f(CW$ sudo bootgraph -callgraph # re-run the tool after restart\fR
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.PP
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.SS "rebuild timeline from logs"
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.PP
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Rebuild the html from a previous run's logs, using the same options.
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.IP
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\f(CW$ bootgraph -dmesg dmesg.txt -ftrace ftrace.txt -callgraph\fR
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.PP
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Rebuild the html with different options.
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.IP
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\f(CW$ bootgraph -dmesg dmesg.txt -ftrace ftrace.txt -addlogs\fR
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.SH "SEE ALSO"
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dmesg(1), update-grub(8), crontab(1), reboot(8)
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.PP
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.SH AUTHOR
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.nf
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Written by Todd Brandt <todd.e.brandt@linux.intel.com>
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