diff options
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 100 |
1 files changed, 80 insertions, 20 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index c4f0f2e4126e..5e3de28c7677 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -12,22 +12,22 @@ config NOP_TRACER config HAVE_FTRACE_NMI_ENTER bool help - See Documentation/trace/ftrace-design.txt + See Documentation/trace/ftrace-design.rst config HAVE_FUNCTION_TRACER bool help - See Documentation/trace/ftrace-design.txt + See Documentation/trace/ftrace-design.rst config HAVE_FUNCTION_GRAPH_TRACER bool help - See Documentation/trace/ftrace-design.txt + See Documentation/trace/ftrace-design.rst config HAVE_DYNAMIC_FTRACE bool help - See Documentation/trace/ftrace-design.txt + See Documentation/trace/ftrace-design.rst config HAVE_DYNAMIC_FTRACE_WITH_REGS bool @@ -35,18 +35,23 @@ config HAVE_DYNAMIC_FTRACE_WITH_REGS config HAVE_FTRACE_MCOUNT_RECORD bool help - See Documentation/trace/ftrace-design.txt + See Documentation/trace/ftrace-design.rst config HAVE_SYSCALL_TRACEPOINTS bool help - See Documentation/trace/ftrace-design.txt + See Documentation/trace/ftrace-design.rst config HAVE_FENTRY bool help Arch supports the gcc options -pg with -mfentry +config HAVE_NOP_MCOUNT + bool + help + Arch supports the gcc options -pg with -mrecord-mcount and -nop-mcount + config HAVE_C_RECORDMCOUNT bool help @@ -82,6 +87,15 @@ config RING_BUFFER_ALLOW_SWAP Allow the use of ring_buffer_swap_cpu. Adds a very slight overhead to tracing when enabled. +config PREEMPTIRQ_TRACEPOINTS + bool + depends on TRACE_PREEMPT_TOGGLE || TRACE_IRQFLAGS + select TRACING + default y + help + Create preempt/irq toggle tracepoints if needed, so that other parts + of the kernel can use them to generate or add hooks to them. + # All tracer options should select GENERIC_TRACER. For those options that are # enabled by all tracers (context switch and event tracer) they select TRACING. # This allows those options to appear when no other tracer is selected. But the @@ -110,11 +124,7 @@ config GENERIC_TRACER # config TRACING_SUPPORT bool - # PPC32 has no irqflags tracing support, but it can use most of the - # tracers anyway, they were tested to build and work. Note that new - # exceptions to this list aren't welcomed, better implement the - # irqflags tracing for your architecture. - depends on TRACE_IRQFLAGS_SUPPORT || PPC32 + depends on TRACE_IRQFLAGS_SUPPORT depends on STACKTRACE_SUPPORT default y @@ -159,18 +169,20 @@ config FUNCTION_GRAPH_TRACER the return value. This is done by setting the current return address on the current task structure into a stack of calls. +config TRACE_PREEMPT_TOGGLE + bool + help + Enables hooks which will be called when preemption is first disabled, + and last enabled. config PREEMPTIRQ_EVENTS bool "Enable trace events for preempt and irq disable/enable" select TRACE_IRQFLAGS - depends on DEBUG_PREEMPT || !PROVE_LOCKING - depends on TRACING + select TRACE_PREEMPT_TOGGLE if PREEMPT + select GENERIC_TRACER default n help Enable tracing of disable and enable events for preemption and irqs. - For tracing preempt disable/enable events, DEBUG_PREEMPT must be - enabled. For tracing irq disable/enable events, PROVE_LOCKING must - be disabled. config IRQSOFF_TRACER bool "Interrupts-off Latency Tracer" @@ -207,6 +219,7 @@ config PREEMPT_TRACER select RING_BUFFER_ALLOW_SWAP select TRACER_SNAPSHOT select TRACER_SNAPSHOT_PER_CPU_SWAP + select TRACE_PREEMPT_TOGGLE help This option measures the time spent in preemption-off critical sections, with microsecond accuracy. @@ -452,7 +465,7 @@ config KPROBE_EVENTS help This allows the user to add tracing events (similar to tracepoints) on the fly via the ftrace interface. See - Documentation/trace/kprobetrace.txt for more details. + Documentation/trace/kprobetrace.rst for more details. Those events can be inserted wherever kprobes can probe, and record various register and memory values. @@ -460,6 +473,26 @@ config KPROBE_EVENTS This option is also required by perf-probe subcommand of perf tools. If you want to use perf tools, this option is strongly recommended. +config KPROBE_EVENTS_ON_NOTRACE + bool "Do NOT protect notrace function from kprobe events" + depends on KPROBE_EVENTS + depends on KPROBES_ON_FTRACE + default n + help + This is only for the developers who want to debug ftrace itself + using kprobe events. + + If kprobes can use ftrace instead of breakpoint, ftrace related + functions are protected from kprobe-events to prevent an infinit + recursion or any unexpected execution path which leads to a kernel + crash. + + This option disables such protection and allows you to put kprobe + events on ftrace functions for debugging ftrace by itself. + Note that this might let you shoot yourself in the foot. + + If unsure, say N. + config UPROBE_EVENTS bool "Enable uprobes-based dynamic events" depends on ARCH_SUPPORTS_UPROBES @@ -525,7 +558,7 @@ config FUNCTION_PROFILER in debugfs called function_profile_enabled which defaults to zero. When a 1 is echoed into this file profiling begins, and when a zero is entered, profiling stops. A "functions" file is created in - the trace_stats directory; this file shows the list of functions that + the trace_stat directory; this file shows the list of functions that have been hit and their counters. If in doubt, say N. @@ -579,7 +612,7 @@ config MMIOTRACE implementation and works via page faults. Tracing is disabled by default and can be enabled at run-time. - See Documentation/trace/mmiotrace.txt. + See Documentation/trace/mmiotrace.rst. If you are not helping to develop drivers, say N. config TRACING_MAP @@ -609,7 +642,7 @@ config HIST_TRIGGERS Inter-event tracing of quantities such as latencies is also supported using hist triggers under this option. - See Documentation/trace/histogram.txt. + See Documentation/trace/histogram.rst. If in doubt, say N. config MMIOTRACE_TEST @@ -691,6 +724,21 @@ config RING_BUFFER_STARTUP_TEST If unsure, say N +config PREEMPTIRQ_DELAY_TEST + tristate "Preempt / IRQ disable delay thread to test latency tracers" + depends on m + help + Select this option to build a test module that can help test latency + tracers by executing a preempt or irq disable section with a user + configurable delay. The module busy waits for the duration of the + critical section. + + For example, the following invocation forces a one-time irq-disabled + critical section for 500us: + modprobe preemptirq_delay_test test_mode=irq delay=500000 + + If unsure, say N + config TRACE_EVAL_MAP_FILE bool "Show eval mappings for trace events" depends on TRACING @@ -726,6 +774,18 @@ config TRACING_EVENTS_GPIO help Enable tracing events for gpio subsystem +config GCOV_PROFILE_FTRACE + bool "Enable GCOV profiling on ftrace subsystem" + depends on GCOV_KERNEL + help + Enable GCOV profiling on ftrace subsystem for checking + which functions/lines are tested. + + If unsure, say N. + + Note that on a kernel compiled with this config, ftrace will + run significantly slower. + endif # FTRACE endif # TRACING_SUPPORT |