mirror of https://gitee.com/openkylin/linux.git
tracing: Fix formatting of trace README file
Fix the formatting of the README file in the trace debugfs to fit in an 80 character window. Also add a comment about the event trigger counter with regards to traceon and traceoff. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
Steven Rostedt
parent
26f255646e
commit
71485c4589
|
|
@ -3519,91 +3519,103 @@ static const char readme_msg[] =
|
|||
" instances\t\t- Make sub-buffers with: mkdir instances/foo\n"
|
||||
"\t\t\t Remove sub-buffer with rmdir\n"
|
||||
" trace_options\t\t- Set format or modify how tracing happens\n"
|
||||
"\t\t\t Disable an option by adding a suffix 'no' to the option name\n"
|
||||
"\t\t\t Disable an option by adding a suffix 'no' to the\n"
|
||||
"\t\t\t option name\n"
|
||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||
"\n available_filter_functions - list of functions that can be filtered on\n"
|
||||
" set_ftrace_filter\t- echo function name in here to only trace these functions\n"
|
||||
" accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
|
||||
" modules: Can select a group via module\n"
|
||||
" Format: :mod:<module-name>\n"
|
||||
" example: echo :mod:ext3 > set_ftrace_filter\n"
|
||||
" triggers: a command to perform when function is hit\n"
|
||||
" Format: <function>:<trigger>[:count]\n"
|
||||
" trigger: traceon, traceoff\n"
|
||||
" enable_event:<system>:<event>\n"
|
||||
" disable_event:<system>:<event>\n"
|
||||
" set_ftrace_filter\t- echo function name in here to only trace these\n"
|
||||
"\t\t\t functions\n"
|
||||
"\t accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
|
||||
"\t modules: Can select a group via module\n"
|
||||
"\t Format: :mod:<module-name>\n"
|
||||
"\t example: echo :mod:ext3 > set_ftrace_filter\n"
|
||||
"\t triggers: a command to perform when function is hit\n"
|
||||
"\t Format: <function>:<trigger>[:count]\n"
|
||||
"\t trigger: traceon, traceoff\n"
|
||||
"\t\t enable_event:<system>:<event>\n"
|
||||
"\t\t disable_event:<system>:<event>\n"
|
||||
#ifdef CONFIG_STACKTRACE
|
||||
" stacktrace\n"
|
||||
"\t\t stacktrace\n"
|
||||
#endif
|
||||
#ifdef CONFIG_TRACER_SNAPSHOT
|
||||
" snapshot\n"
|
||||
"\t\t snapshot\n"
|
||||
#endif
|
||||
" example: echo do_fault:traceoff > set_ftrace_filter\n"
|
||||
" echo do_trap:traceoff:3 > set_ftrace_filter\n"
|
||||
" The first one will disable tracing every time do_fault is hit\n"
|
||||
" The second will disable tracing at most 3 times when do_trap is hit\n"
|
||||
" The first time do trap is hit and it disables tracing, the counter\n"
|
||||
" will decrement to 2. If tracing is already disabled, the counter\n"
|
||||
" will not decrement. It only decrements when the trigger did work\n"
|
||||
" To remove trigger without count:\n"
|
||||
" echo '!<function>:<trigger> > set_ftrace_filter\n"
|
||||
" To remove trigger with a count:\n"
|
||||
" echo '!<function>:<trigger>:0 > set_ftrace_filter\n"
|
||||
"\t example: echo do_fault:traceoff > set_ftrace_filter\n"
|
||||
"\t echo do_trap:traceoff:3 > set_ftrace_filter\n"
|
||||
"\t The first one will disable tracing every time do_fault is hit\n"
|
||||
"\t The second will disable tracing at most 3 times when do_trap is hit\n"
|
||||
"\t The first time do trap is hit and it disables tracing, the\n"
|
||||
"\t counter will decrement to 2. If tracing is already disabled,\n"
|
||||
"\t the counter will not decrement. It only decrements when the\n"
|
||||
"\t trigger did work\n"
|
||||
"\t To remove trigger without count:\n"
|
||||
"\t echo '!<function>:<trigger> > set_ftrace_filter\n"
|
||||
"\t To remove trigger with a count:\n"
|
||||
"\t echo '!<function>:<trigger>:0 > set_ftrace_filter\n"
|
||||
" set_ftrace_notrace\t- echo function name in here to never trace.\n"
|
||||
" accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
|
||||
" modules: Can select a group via module command :mod:\n"
|
||||
" Does not accept triggers\n"
|
||||
"\t accepts: func_full_name, *func_end, func_begin*, *func_middle*\n"
|
||||
"\t modules: Can select a group via module command :mod:\n"
|
||||
"\t Does not accept triggers\n"
|
||||
#endif /* CONFIG_DYNAMIC_FTRACE */
|
||||
#ifdef CONFIG_FUNCTION_TRACER
|
||||
" set_ftrace_pid\t- Write pid(s) to only function trace those pids (function)\n"
|
||||
" set_ftrace_pid\t- Write pid(s) to only function trace those pids\n"
|
||||
"\t\t (function)\n"
|
||||
#endif
|
||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||
" set_graph_function\t- Trace the nested calls of a function (function_graph)\n"
|
||||
" max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n"
|
||||
#endif
|
||||
#ifdef CONFIG_TRACER_SNAPSHOT
|
||||
"\n snapshot\t\t- Like 'trace' but shows the content of the static snapshot buffer\n"
|
||||
"\t\t\t Read the contents for more information\n"
|
||||
"\n snapshot\t\t- Like 'trace' but shows the content of the static\n"
|
||||
"\t\t\t snapshot buffer. Read the contents for more\n"
|
||||
"\t\t\t information\n"
|
||||
#endif
|
||||
#ifdef CONFIG_STACK_TRACER
|
||||
" stack_trace\t\t- Shows the max stack trace when active\n"
|
||||
" stack_max_size\t- Shows current max stack size that was traced\n"
|
||||
"\t\t\t Write into this file to reset the max size (trigger a new trace)\n"
|
||||
"\t\t\t Write into this file to reset the max size (trigger a\n"
|
||||
"\t\t\t new trace)\n"
|
||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||
" stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace traces\n"
|
||||
" stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace\n"
|
||||
"\t\t\t traces\n"
|
||||
#endif
|
||||
#endif /* CONFIG_STACK_TRACER */
|
||||
" events/\t\t- Directory containing all trace event subsystems:\n"
|
||||
" enable\t\t- Write 0/1 to enable/disable tracing of all events\n"
|
||||
" events/<system>/\t- Directory containing all trace events for <system>:\n"
|
||||
" enable\t\t- Write 0/1 to enable/disable tracing of all <system> events\n"
|
||||
" enable\t\t- Write 0/1 to enable/disable tracing of all <system>\n"
|
||||
"\t\t\t events\n"
|
||||
" filter\t\t- If set, only events passing filter are traced\n"
|
||||
" events/<system>/<event>/\t- Directory containing control files for <event>:\n"
|
||||
" events/<system>/<event>/\t- Directory containing control files for\n"
|
||||
"\t\t\t <event>:\n"
|
||||
" enable\t\t- Write 0/1 to enable/disable tracing of <event>\n"
|
||||
" filter\t\t- If set, only events passing filter are traced\n"
|
||||
" trigger\t\t- If set, a command to perform when event is hit\n"
|
||||
" Format: <trigger>[:count][if <filter>]\n"
|
||||
" trigger: traceon, traceoff\n"
|
||||
" enable_event:<system>:<event>\n"
|
||||
" disable_event:<system>:<event>\n"
|
||||
"\t Format: <trigger>[:count][if <filter>]\n"
|
||||
"\t trigger: traceon, traceoff\n"
|
||||
"\t enable_event:<system>:<event>\n"
|
||||
"\t disable_event:<system>:<event>\n"
|
||||
#ifdef CONFIG_STACKTRACE
|
||||
" stacktrace\n"
|
||||
"\t\t stacktrace\n"
|
||||
#endif
|
||||
#ifdef CONFIG_TRACER_SNAPSHOT
|
||||
" snapshot\n"
|
||||
"\t\t snapshot\n"
|
||||
#endif
|
||||
" example: echo traceoff > events/block/block_unplug/trigger\n"
|
||||
" echo traceoff:3 > events/block/block_unplug/trigger\n"
|
||||
" echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > events/block/block_unplug/trigger\n"
|
||||
" The first disables tracing every time block_unplug is hit.\n"
|
||||
" The second disables tracing the first 3 times block_unplug is hit.\n"
|
||||
" The third enables the kmalloc event the first 3 times block_unplug\n"
|
||||
" is hit and has value of greater than 1 for the 'nr_rq' event field.\n"
|
||||
" To remove a trigger without a count:\n"
|
||||
" echo '!<trigger> > <system>/<event>/trigger\n"
|
||||
" To remove a trigger with a count:\n"
|
||||
" echo '!<trigger>:0 > <system>/<event>/trigger\n"
|
||||
" Filters can be ignored when removing a trigger.\n"
|
||||
"\t example: echo traceoff > events/block/block_unplug/trigger\n"
|
||||
"\t echo traceoff:3 > events/block/block_unplug/trigger\n"
|
||||
"\t echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n"
|
||||
"\t events/block/block_unplug/trigger\n"
|
||||
"\t The first disables tracing every time block_unplug is hit.\n"
|
||||
"\t The second disables tracing the first 3 times block_unplug is hit.\n"
|
||||
"\t The third enables the kmalloc event the first 3 times block_unplug\n"
|
||||
"\t is hit and has value of greater than 1 for the 'nr_rq' event field.\n"
|
||||
"\t Like function triggers, the counter is only decremented if it\n"
|
||||
"\t enabled or disabled tracing.\n"
|
||||
"\t To remove a trigger without a count:\n"
|
||||
"\t echo '!<trigger> > <system>/<event>/trigger\n"
|
||||
"\t To remove a trigger with a count:\n"
|
||||
"\t echo '!<trigger>:0 > <system>/<event>/trigger\n"
|
||||
"\t Filters can be ignored when removing a trigger.\n"
|
||||
;
|
||||
|
||||
static ssize_t
|
||||
|
|
|
|||
Loading…
Reference in New Issue