--func-opts::
List of options allowed to set:
- call-graph - Display kernel stack trace for function tracer.
- irq-info - Display irq context info for function tracer.
+
+ - call-graph - Display kernel stack trace for function tracer.
+ - irq-info - Display irq context info for function tracer.
-G::
--graph-funcs=::
--graph-opts::
List of options allowed to set:
- nosleep-time - Measure on-CPU time only for function_graph tracer.
- noirqs - Ignore functions that happen inside interrupt.
- verbose - Show process names, PIDs, timestamps, etc.
- thresh=<n> - Setup trace duration threshold in microseconds.
- depth=<n> - Set max depth for function graph tracer to follow.
+
+ - nosleep-time - Measure on-CPU time only for function_graph tracer.
+ - noirqs - Ignore functions that happen inside interrupt.
+ - verbose - Show process names, PIDs, timestamps, etc.
+ - thresh=<n> - Setup trace duration threshold in microseconds.
+ - depth=<n> - Set max depth for function graph tracer to follow.
OPTIONS for 'perf ftrace latency'
Select AUX area tracing Snapshot Mode. This option is valid only with an
AUX area tracing event. Optionally, certain snapshot capturing parameters
can be specified in a string that follows this option:
- 'e': take one last snapshot on exit; guarantees that there is at least one
+
+ - 'e': take one last snapshot on exit; guarantees that there is at least one
snapshot in the output file;
- <size>: if the PMU supports this, specify the desired snapshot size.
+ - <size>: if the PMU supports this, specify the desired snapshot size.
In Snapshot Mode trace data is captured only when signal SIGUSR2 is received
and on exit if the above 'e' option is given.
--affinity=mode::
Set affinity mask of trace reading thread according to the policy defined by 'mode' value:
- node - thread affinity mask is set to NUMA node cpu mask of the processed mmap buffer
- cpu - thread affinity mask is set to cpu of the processed mmap buffer
+
+ - node - thread affinity mask is set to NUMA node cpu mask of the processed mmap buffer
+ - cpu - thread affinity mask is set to cpu of the processed mmap buffer
--mmap-flush=number::
--switch-output[=mode]::
Generate multiple perf.data files, timestamp prefixed, switching to a new one
based on 'mode' value:
- "signal" - when receiving a SIGUSR2 (default value) or
- <size> - when reaching the size threshold, size is expected to
- be a number with appended unit character - B/K/M/G
- <time> - when reaching the time threshold, size is expected to
- be a number with appended unit character - s/m/h/d
- Note: the precision of the size threshold hugely depends
- on your configuration - the number and size of your ring
- buffers (-m). It is generally more precise for higher sizes
- (like >5M), for lower values expect different sizes.
+ - "signal" - when receiving a SIGUSR2 (default value) or
+ - <size> - when reaching the size threshold, size is expected to
+ be a number with appended unit character - B/K/M/G
+ - <time> - when reaching the time threshold, size is expected to
+ be a number with appended unit character - s/m/h/d
+
+ Note: the precision of the size threshold hugely depends
+ on your configuration - the number and size of your ring
+ buffers (-m). It is generally more precise for higher sizes
+ (like >5M), for lower values expect different sizes.
A possible use case is to, given an external event, slice the perf.data file
that gets then processed, possibly via a perf script, to decide if that
kernel and modules.
Available types are:
- 'task' - synthesize FORK and COMM events for each task
- 'mmap' - synthesize MMAP events for each process (implies 'task')
- 'cgroup' - synthesize CGROUP events for each cgroup
- 'all' - synthesize all events (default)
- 'no' - do not synthesize any of the above events
+
+ - 'task' - synthesize FORK and COMM events for each task
+ - 'mmap' - synthesize MMAP events for each process (implies 'task')
+ - 'cgroup' - synthesize CGROUP events for each cgroup
+ - 'all' - synthesize all events (default)
+ - 'no' - do not synthesize any of the above events
--tail-synthesize::
Instead of collecting non-sample events (for example, fork, comm, mmap) at
Listen on ctl-fd descriptor for command to control measurement.
Available commands:
- 'enable' : enable events
- 'disable' : disable events
- 'enable name' : enable event 'name'
- 'disable name' : disable event 'name'
- 'snapshot' : AUX area tracing snapshot).
- 'stop' : stop perf record
- 'ping' : ping
-
- 'evlist [-v|-g|-F] : display all events
- -F Show just the sample frequency used for each event.
- -v Show all fields.
- -g Show event group information.
+
+ - 'enable' : enable events
+ - 'disable' : disable events
+ - 'enable name' : enable event 'name'
+ - 'disable name' : disable event 'name'
+ - 'snapshot' : AUX area tracing snapshot).
+ - 'stop' : stop perf record
+ - 'ping' : ping
+ - 'evlist [-v|-g|-F] : display all events
+
+ -F Show just the sample frequency used for each event.
+ -v Show all fields.
+ -g Show event group information.
Measurements can be started with events disabled using --delay=-1 option. Optionally
send control command completion ('ack\n') to ack-fd descriptor to synchronize with the
<spec> value can also be a string meaning predefined parallel threads
layout:
- cpu - create new data streaming thread for every monitored cpu
- core - create new thread to monitor CPUs grouped by a core
- package - create new thread to monitor CPUs grouped by a package
- numa - create new threed to monitor CPUs grouped by a NUMA domain
+ - cpu - create new data streaming thread for every monitored cpu
+ - core - create new thread to monitor CPUs grouped by a core
+ - package - create new thread to monitor CPUs grouped by a package
+ - numa - create new threed to monitor CPUs grouped by a NUMA domain
Predefined layouts can be used on systems with large number of CPUs in
order not to spawn multiple per-cpu streaming threads but still avoid LOST
projects / platform / kernel / linux-rpi.git / commitdiff