twx-linux/kernel/trace
Viktor Rosendahl (BMW) 793937236d preemptirq_delay_test: Add the burst feature and a sysfs trigger
This burst feature enables the user to generate a burst of
preempt/irqsoff latencies. This makes it possible to test whether we
are able to detect latencies that systematically occur very close to
each other.

The maximum burst size is 10. We also create 10 identical test
functions, so that we get 10 different backtraces; this is useful
when we want to test whether we can detect all the latencies in a
burst. Otherwise, there would be no easy way of differentiating
between which latency in a burst was captured by the tracer.

In addition, there is a sysfs trigger, so that it's not necessary to
reload the module to repeat the test. The trigger will appear as
/sys/kernel/preemptirq_delay_test/trigger in sysfs.

Link: http://lkml.kernel.org/r/20191008220824.7911-3-viktor.rosendahl@gmail.com

Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Viktor Rosendahl (BMW) <viktor.rosendahl@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-11-13 09:37:28 -05:00
..
blktrace.c blktrace: no need to check return value of debugfs_create functions 2019-06-03 15:39:39 +02:00
bpf_trace.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-28 17:47:33 -07:00
fgraph.c ftrace: Look up the address of return_to_handler() using helpers 2019-09-18 12:24:47 +10:00
ftrace_internal.h treewide: Rename rcu_dereference_raw_notrace() to _check() 2019-08-01 14:16:21 -07:00
ftrace.c ftrace: Add information on number of page groups allocated 2019-11-13 09:37:28 -05:00
Kconfig preemptirq_delay_test: Add the burst feature and a sysfs trigger 2019-11-13 09:37:28 -05:00
Makefile
power-traces.c
preemptirq_delay_test.c preemptirq_delay_test: Add the burst feature and a sysfs trigger 2019-11-13 09:37:28 -05:00
ring_buffer_benchmark.c tracing: Use CONFIG_PREEMPTION 2019-07-31 19:03:35 +02:00
ring_buffer.c ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS 2019-05-28 09:36:19 -04:00
rpm-traces.c
trace_benchmark.c
trace_benchmark.h
trace_branch.c x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP 2019-04-03 11:02:24 +02:00
trace_clock.c
trace_dynevent.c tracing: Add tracing_check_open_get_tr() 2019-10-12 20:44:07 -04:00
trace_dynevent.h tracing/dynevent: Pass extra arguments to match operation 2019-08-31 12:19:38 -04:00
trace_entries.h
trace_event_perf.c tracing: Fix race in perf_trace_buf initialization 2019-10-21 19:38:28 -04:00
trace_events_filter_test.h
trace_events_filter.c tracing: Have error path in predicate_parse() free its allocated memory 2019-09-28 17:13:39 -04:00
trace_events_hist.c tracing: Fix "gfp_t" format for synthetic events 2019-10-18 14:42:53 -04:00
trace_events_trigger.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_events.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_export.c
trace_functions_graph.c fgraph: Remove redundant ftrace_graph_notrace_addr() test 2019-07-30 21:50:03 -04:00
trace_functions.c
trace_hwlat.c ftrace: Implement fs notification for tracing_max_latency 2019-11-13 09:37:28 -05:00
trace_irqsoff.c
trace_kdb.c tracing: Silence GCC 9 array bounds warning 2019-05-25 23:04:30 -04:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_mmiotrace.c
trace_nop.c
trace_output.c tracing: Be more clever when dumping hex in __print_hex() 2019-09-17 11:21:28 -04:00
trace_output.h
trace_preemptirq.c
trace_printk.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_probe_tmpl.h tracing/probe: Support user-space dereference 2019-05-25 23:04:42 -04:00
trace_probe.c tracing/probe: Fix to check the difference of nr_args before adding probe 2019-09-28 17:07:53 -04:00
trace_probe.h tracing/probe: Reject exactly same probe event 2019-09-19 11:09:16 -04:00
trace_sched_switch.c
trace_sched_wakeup.c sched/core: Convert get_task_struct() to return the task 2019-07-25 15:51:54 +02:00
trace_selftest_dynamic.c
trace_selftest.c function_graph: Have selftest also emulate tr->reset() as it did with tr->init() 2019-04-21 19:46:56 -04:00
trace_seq.c
trace_stack.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_stat.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace_stat.h
trace_syscalls.c syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
trace_uprobe.c tracing: Add locked_down checks to the open calls of files created for tracefs 2019-10-12 20:48:06 -04:00
trace.c ftrace: Implement fs notification for tracing_max_latency 2019-11-13 09:37:28 -05:00
trace.h ftrace: Implement fs notification for tracing_max_latency 2019-11-13 09:37:28 -05:00
tracing_map.c
tracing_map.h