![Thomas Renninger](/assets/img/avatar_default.png)
Add these new power trace events: power:cpu_idle power:cpu_frequency power:machine_suspend The old C-state/idle accounting events: power:power_start power:power_end Have now a replacement (but we are still keeping the old tracepoints for compatibility): power:cpu_idle and power:power_frequency is replaced with: power:cpu_frequency power:machine_suspend is newly introduced. Jean Pihet has a patch integrated into the generic layer (kernel/power/suspend.c) which will make use of it. the type= field got removed from both, it was never used and the type is differed by the event type itself. perf timechart userspace tool gets adjusted in a separate patch. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Acked-by: Jean Pihet <jean.pihet@newoldbits.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: rjw@sisk.pl LKML-Reference: <1294073445-14812-3-git-send-email-trenn@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> LKML-Reference: <1290072314-31155-2-git-send-email-trenn@suse.de>
494 lines
14 KiB
Text
494 lines
14 KiB
Text
#
|
|
# Architectures that offer an FUNCTION_TRACER implementation should
|
|
# select HAVE_FUNCTION_TRACER:
|
|
#
|
|
|
|
config USER_STACKTRACE_SUPPORT
|
|
bool
|
|
|
|
config NOP_TRACER
|
|
bool
|
|
|
|
config HAVE_FTRACE_NMI_ENTER
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_FUNCTION_TRACER
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_FUNCTION_GRAPH_TRACER
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_FUNCTION_GRAPH_FP_TEST
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_FUNCTION_TRACE_MCOUNT_TEST
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_DYNAMIC_FTRACE
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_FTRACE_MCOUNT_RECORD
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_SYSCALL_TRACEPOINTS
|
|
bool
|
|
help
|
|
See Documentation/trace/ftrace-design.txt
|
|
|
|
config HAVE_C_RECORDMCOUNT
|
|
bool
|
|
help
|
|
C version of recordmcount available?
|
|
|
|
config TRACER_MAX_TRACE
|
|
bool
|
|
|
|
config RING_BUFFER
|
|
bool
|
|
|
|
config FTRACE_NMI_ENTER
|
|
bool
|
|
depends on HAVE_FTRACE_NMI_ENTER
|
|
default y
|
|
|
|
config EVENT_TRACING
|
|
select CONTEXT_SWITCH_TRACER
|
|
bool
|
|
|
|
config EVENT_POWER_TRACING_DEPRECATED
|
|
depends on EVENT_TRACING
|
|
bool "Deprecated power event trace API, to be removed"
|
|
default y
|
|
help
|
|
Provides old power event types:
|
|
C-state/idle accounting events:
|
|
power:power_start
|
|
power:power_end
|
|
and old cpufreq accounting event:
|
|
power:power_frequency
|
|
This is for userspace compatibility
|
|
and will vanish after 5 kernel iterations,
|
|
namely 2.6.41.
|
|
|
|
config CONTEXT_SWITCH_TRACER
|
|
bool
|
|
|
|
config RING_BUFFER_ALLOW_SWAP
|
|
bool
|
|
help
|
|
Allow the use of ring_buffer_swap_cpu.
|
|
Adds a very slight overhead to tracing when enabled.
|
|
|
|
# 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
|
|
# options do not appear when something else selects it. We need the two options
|
|
# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the
|
|
# hiding of the automatic options.
|
|
|
|
config TRACING
|
|
bool
|
|
select DEBUG_FS
|
|
select RING_BUFFER
|
|
select STACKTRACE if STACKTRACE_SUPPORT
|
|
select TRACEPOINTS
|
|
select NOP_TRACER
|
|
select BINARY_PRINTF
|
|
select EVENT_TRACING
|
|
|
|
config GENERIC_TRACER
|
|
bool
|
|
select TRACING
|
|
|
|
#
|
|
# Minimum requirements an architecture has to meet for us to
|
|
# be able to offer generic tracing facilities:
|
|
#
|
|
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 STACKTRACE_SUPPORT
|
|
default y
|
|
|
|
if TRACING_SUPPORT
|
|
|
|
menuconfig FTRACE
|
|
bool "Tracers"
|
|
default y if DEBUG_KERNEL
|
|
help
|
|
Enable the kernel tracing infrastructure.
|
|
|
|
if FTRACE
|
|
|
|
config FUNCTION_TRACER
|
|
bool "Kernel Function Tracer"
|
|
depends on HAVE_FUNCTION_TRACER
|
|
select FRAME_POINTER if !ARM_UNWIND && !S390
|
|
select KALLSYMS
|
|
select GENERIC_TRACER
|
|
select CONTEXT_SWITCH_TRACER
|
|
help
|
|
Enable the kernel to trace every kernel function. This is done
|
|
by using a compiler feature to insert a small, 5-byte No-Operation
|
|
instruction at the beginning of every kernel function, which NOP
|
|
sequence is then dynamically patched into a tracer call when
|
|
tracing is enabled by the administrator. If it's runtime disabled
|
|
(the bootup default), then the overhead of the instructions is very
|
|
small and not measurable even in micro-benchmarks.
|
|
|
|
config FUNCTION_GRAPH_TRACER
|
|
bool "Kernel Function Graph Tracer"
|
|
depends on HAVE_FUNCTION_GRAPH_TRACER
|
|
depends on FUNCTION_TRACER
|
|
depends on !X86_32 || !CC_OPTIMIZE_FOR_SIZE
|
|
default y
|
|
help
|
|
Enable the kernel to trace a function at both its return
|
|
and its entry.
|
|
Its first purpose is to trace the duration of functions and
|
|
draw a call graph for each thread with some information like
|
|
the return value. This is done by setting the current return
|
|
address on the current task structure into a stack of calls.
|
|
|
|
|
|
config IRQSOFF_TRACER
|
|
bool "Interrupts-off Latency Tracer"
|
|
default n
|
|
depends on TRACE_IRQFLAGS_SUPPORT
|
|
depends on !ARCH_USES_GETTIMEOFFSET
|
|
select TRACE_IRQFLAGS
|
|
select GENERIC_TRACER
|
|
select TRACER_MAX_TRACE
|
|
select RING_BUFFER_ALLOW_SWAP
|
|
help
|
|
This option measures the time spent in irqs-off critical
|
|
sections, with microsecond accuracy.
|
|
|
|
The default measurement method is a maximum search, which is
|
|
disabled by default and can be runtime (re-)started
|
|
via:
|
|
|
|
echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
|
|
|
|
(Note that kernel size and overhead increase with this option
|
|
enabled. This option and the preempt-off timing option can be
|
|
used together or separately.)
|
|
|
|
config PREEMPT_TRACER
|
|
bool "Preemption-off Latency Tracer"
|
|
default n
|
|
depends on !ARCH_USES_GETTIMEOFFSET
|
|
depends on PREEMPT
|
|
select GENERIC_TRACER
|
|
select TRACER_MAX_TRACE
|
|
select RING_BUFFER_ALLOW_SWAP
|
|
help
|
|
This option measures the time spent in preemption-off critical
|
|
sections, with microsecond accuracy.
|
|
|
|
The default measurement method is a maximum search, which is
|
|
disabled by default and can be runtime (re-)started
|
|
via:
|
|
|
|
echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
|
|
|
|
(Note that kernel size and overhead increase with this option
|
|
enabled. This option and the irqs-off timing option can be
|
|
used together or separately.)
|
|
|
|
config SCHED_TRACER
|
|
bool "Scheduling Latency Tracer"
|
|
select GENERIC_TRACER
|
|
select CONTEXT_SWITCH_TRACER
|
|
select TRACER_MAX_TRACE
|
|
help
|
|
This tracer tracks the latency of the highest priority task
|
|
to be scheduled in, starting from the point it has woken up.
|
|
|
|
config ENABLE_DEFAULT_TRACERS
|
|
bool "Trace process context switches and events"
|
|
depends on !GENERIC_TRACER
|
|
select TRACING
|
|
help
|
|
This tracer hooks to various trace points in the kernel,
|
|
allowing the user to pick and choose which trace point they
|
|
want to trace. It also includes the sched_switch tracer plugin.
|
|
|
|
config FTRACE_SYSCALLS
|
|
bool "Trace syscalls"
|
|
depends on HAVE_SYSCALL_TRACEPOINTS
|
|
select GENERIC_TRACER
|
|
select KALLSYMS
|
|
help
|
|
Basic tracer to catch the syscall entry and exit events.
|
|
|
|
config TRACE_BRANCH_PROFILING
|
|
bool
|
|
select GENERIC_TRACER
|
|
|
|
choice
|
|
prompt "Branch Profiling"
|
|
default BRANCH_PROFILE_NONE
|
|
help
|
|
The branch profiling is a software profiler. It will add hooks
|
|
into the C conditionals to test which path a branch takes.
|
|
|
|
The likely/unlikely profiler only looks at the conditions that
|
|
are annotated with a likely or unlikely macro.
|
|
|
|
The "all branch" profiler will profile every if-statement in the
|
|
kernel. This profiler will also enable the likely/unlikely
|
|
profiler.
|
|
|
|
Either of the above profilers adds a bit of overhead to the system.
|
|
If unsure, choose "No branch profiling".
|
|
|
|
config BRANCH_PROFILE_NONE
|
|
bool "No branch profiling"
|
|
help
|
|
No branch profiling. Branch profiling adds a bit of overhead.
|
|
Only enable it if you want to analyse the branching behavior.
|
|
Otherwise keep it disabled.
|
|
|
|
config PROFILE_ANNOTATED_BRANCHES
|
|
bool "Trace likely/unlikely profiler"
|
|
select TRACE_BRANCH_PROFILING
|
|
help
|
|
This tracer profiles all the the likely and unlikely macros
|
|
in the kernel. It will display the results in:
|
|
|
|
/sys/kernel/debug/tracing/profile_annotated_branch
|
|
|
|
Note: this will add a significant overhead; only turn this
|
|
on if you need to profile the system's use of these macros.
|
|
|
|
config PROFILE_ALL_BRANCHES
|
|
bool "Profile all if conditionals"
|
|
select TRACE_BRANCH_PROFILING
|
|
help
|
|
This tracer profiles all branch conditions. Every if ()
|
|
taken in the kernel is recorded whether it hit or miss.
|
|
The results will be displayed in:
|
|
|
|
/sys/kernel/debug/tracing/profile_branch
|
|
|
|
This option also enables the likely/unlikely profiler.
|
|
|
|
This configuration, when enabled, will impose a great overhead
|
|
on the system. This should only be enabled when the system
|
|
is to be analyzed in much detail.
|
|
endchoice
|
|
|
|
config TRACING_BRANCHES
|
|
bool
|
|
help
|
|
Selected by tracers that will trace the likely and unlikely
|
|
conditions. This prevents the tracers themselves from being
|
|
profiled. Profiling the tracing infrastructure can only happen
|
|
when the likelys and unlikelys are not being traced.
|
|
|
|
config BRANCH_TRACER
|
|
bool "Trace likely/unlikely instances"
|
|
depends on TRACE_BRANCH_PROFILING
|
|
select TRACING_BRANCHES
|
|
help
|
|
This traces the events of likely and unlikely condition
|
|
calls in the kernel. The difference between this and the
|
|
"Trace likely/unlikely profiler" is that this is not a
|
|
histogram of the callers, but actually places the calling
|
|
events into a running trace buffer to see when and where the
|
|
events happened, as well as their results.
|
|
|
|
Say N if unsure.
|
|
|
|
config STACK_TRACER
|
|
bool "Trace max stack"
|
|
depends on HAVE_FUNCTION_TRACER
|
|
select FUNCTION_TRACER
|
|
select STACKTRACE
|
|
select KALLSYMS
|
|
help
|
|
This special tracer records the maximum stack footprint of the
|
|
kernel and displays it in /sys/kernel/debug/tracing/stack_trace.
|
|
|
|
This tracer works by hooking into every function call that the
|
|
kernel executes, and keeping a maximum stack depth value and
|
|
stack-trace saved. If this is configured with DYNAMIC_FTRACE
|
|
then it will not have any overhead while the stack tracer
|
|
is disabled.
|
|
|
|
To enable the stack tracer on bootup, pass in 'stacktrace'
|
|
on the kernel command line.
|
|
|
|
The stack tracer can also be enabled or disabled via the
|
|
sysctl kernel.stack_tracer_enabled
|
|
|
|
Say N if unsure.
|
|
|
|
config BLK_DEV_IO_TRACE
|
|
bool "Support for tracing block IO actions"
|
|
depends on SYSFS
|
|
depends on BLOCK
|
|
select RELAY
|
|
select DEBUG_FS
|
|
select TRACEPOINTS
|
|
select GENERIC_TRACER
|
|
select STACKTRACE
|
|
help
|
|
Say Y here if you want to be able to trace the block layer actions
|
|
on a given queue. Tracing allows you to see any traffic happening
|
|
on a block device queue. For more information (and the userspace
|
|
support tools needed), fetch the blktrace tools from:
|
|
|
|
git://git.kernel.dk/blktrace.git
|
|
|
|
Tracing also is possible using the ftrace interface, e.g.:
|
|
|
|
echo 1 > /sys/block/sda/sda1/trace/enable
|
|
echo blk > /sys/kernel/debug/tracing/current_tracer
|
|
cat /sys/kernel/debug/tracing/trace_pipe
|
|
|
|
If unsure, say N.
|
|
|
|
config KPROBE_EVENT
|
|
depends on KPROBES
|
|
depends on HAVE_REGS_AND_STACK_ACCESS_API
|
|
bool "Enable kprobes-based dynamic events"
|
|
select TRACING
|
|
default y
|
|
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.
|
|
|
|
Those events can be inserted wherever kprobes can probe, and record
|
|
various register and memory values.
|
|
|
|
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 DYNAMIC_FTRACE
|
|
bool "enable/disable ftrace tracepoints dynamically"
|
|
depends on FUNCTION_TRACER
|
|
depends on HAVE_DYNAMIC_FTRACE
|
|
default y
|
|
help
|
|
This option will modify all the calls to ftrace dynamically
|
|
(will patch them out of the binary image and replace them
|
|
with a No-Op instruction) as they are called. A table is
|
|
created to dynamically enable them again.
|
|
|
|
This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but
|
|
otherwise has native performance as long as no tracing is active.
|
|
|
|
The changes to the code are done by a kernel thread that
|
|
wakes up once a second and checks to see if any ftrace calls
|
|
were made. If so, it runs stop_machine (stops all CPUS)
|
|
and modifies the code to jump over the call to ftrace.
|
|
|
|
config FUNCTION_PROFILER
|
|
bool "Kernel function profiler"
|
|
depends on FUNCTION_TRACER
|
|
default n
|
|
help
|
|
This option enables the kernel function profiler. A file is created
|
|
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
|
|
have been hit and their counters.
|
|
|
|
If in doubt, say N.
|
|
|
|
config FTRACE_MCOUNT_RECORD
|
|
def_bool y
|
|
depends on DYNAMIC_FTRACE
|
|
depends on HAVE_FTRACE_MCOUNT_RECORD
|
|
|
|
config FTRACE_SELFTEST
|
|
bool
|
|
|
|
config FTRACE_STARTUP_TEST
|
|
bool "Perform a startup test on ftrace"
|
|
depends on GENERIC_TRACER
|
|
select FTRACE_SELFTEST
|
|
help
|
|
This option performs a series of startup tests on ftrace. On bootup
|
|
a series of tests are made to verify that the tracer is
|
|
functioning properly. It will do tests on all the configured
|
|
tracers of ftrace.
|
|
|
|
config EVENT_TRACE_TEST_SYSCALLS
|
|
bool "Run selftest on syscall events"
|
|
depends on FTRACE_STARTUP_TEST
|
|
help
|
|
This option will also enable testing every syscall event.
|
|
It only enables the event and disables it and runs various loads
|
|
with the event enabled. This adds a bit more time for kernel boot
|
|
up since it runs this on every system call defined.
|
|
|
|
TBD - enable a way to actually call the syscalls as we test their
|
|
events
|
|
|
|
config MMIOTRACE
|
|
bool "Memory mapped IO tracing"
|
|
depends on HAVE_MMIOTRACE_SUPPORT && PCI
|
|
select GENERIC_TRACER
|
|
help
|
|
Mmiotrace traces Memory Mapped I/O access and is meant for
|
|
debugging and reverse engineering. It is called from the ioremap
|
|
implementation and works via page faults. Tracing is disabled by
|
|
default and can be enabled at run-time.
|
|
|
|
See Documentation/trace/mmiotrace.txt.
|
|
If you are not helping to develop drivers, say N.
|
|
|
|
config MMIOTRACE_TEST
|
|
tristate "Test module for mmiotrace"
|
|
depends on MMIOTRACE && m
|
|
help
|
|
This is a dumb module for testing mmiotrace. It is very dangerous
|
|
as it will write garbage to IO memory starting at a given address.
|
|
However, it should be safe to use on e.g. unused portion of VRAM.
|
|
|
|
Say N, unless you absolutely know what you are doing.
|
|
|
|
config RING_BUFFER_BENCHMARK
|
|
tristate "Ring buffer benchmark stress tester"
|
|
depends on RING_BUFFER
|
|
help
|
|
This option creates a test to stress the ring buffer and benchmark it.
|
|
It creates its own ring buffer such that it will not interfere with
|
|
any other users of the ring buffer (such as ftrace). It then creates
|
|
a producer and consumer that will run for 10 seconds and sleep for
|
|
10 seconds. Each interval it will print out the number of events
|
|
it recorded and give a rough estimate of how long each iteration took.
|
|
|
|
It does not disable interrupts or raise its priority, so it may be
|
|
affected by processes that are running.
|
|
|
|
If unsure, say N.
|
|
|
|
endif # FTRACE
|
|
|
|
endif # TRACING_SUPPORT
|
|
|