b336dafa11
It is sometimes useful to profile how long CPU frequency switches
take, and traces have already been added for this purpose. Make
use of these and the trace_stat framework to generate statistical
histograms of frequency switch times in the following format:
# cat /sys/kernel/debug/tracing/trace_stat/cpu_freq_switch
CPU START_KHZ END_KHZ COUNT AVG_US MIN_US MAX_US
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0 384000 1512000 3 2787 1648 3418
0 486000 384000 1 1129 1129 1129
0 1458000 384000 1 3174 3174 3174
0 1512000 384000 1 3265 3265 3265
0 1512000 486000 1 3235 3235 3235
0 1512000 1458000 1 213 213 213
0 1512000 1512000 1 0 0 0
Profiling is disabled by default (since it does incur some
overhead). It can be enabled or re-disabled echoing 1 or 0
to /sys/kernel/debug/tracing/cpu_freq_switch_profile_enabled
Change-Id: I3ef7f9d681b7bd13bcaa031003b10312afe1aefe
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
(cherry picked from commit a629fb0b67b57cc6759da51b9c12750758736c80)
67 lines
2.1 KiB
Makefile
67 lines
2.1 KiB
Makefile
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# Do not instrument the tracer itself:
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ifdef CONFIG_FUNCTION_TRACER
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ORIG_CFLAGS := $(KBUILD_CFLAGS)
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KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
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# selftest needs instrumentation
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CFLAGS_trace_selftest_dynamic.o = -pg
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obj-y += trace_selftest_dynamic.o
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endif
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# If unlikely tracing is enabled, do not trace these files
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ifdef CONFIG_TRACING_BRANCHES
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KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
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endif
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CFLAGS_trace_events_filter.o := -I$(src)
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#
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# Make the trace clocks available generally: it's infrastructure
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# relied on by ptrace for example:
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#
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obj-y += trace_clock.o
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obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
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obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
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obj-$(CONFIG_RING_BUFFER_BENCHMARK) += ring_buffer_benchmark.o
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obj-$(CONFIG_TRACING) += trace.o
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obj-$(CONFIG_TRACING) += trace_output.o
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obj-$(CONFIG_TRACING) += trace_stat.o
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obj-$(CONFIG_TRACING) += trace_printk.o
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obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
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obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
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obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
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obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
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obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
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obj-$(CONFIG_CPU_FREQ_SWITCH_PROFILER) += trace_cpu_freq_switch.o
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obj-$(CONFIG_NOP_TRACER) += trace_nop.o
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obj-$(CONFIG_STACK_TRACER) += trace_stack.o
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obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
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obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
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obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
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obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
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ifeq ($(CONFIG_BLOCK),y)
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obj-$(CONFIG_EVENT_TRACING) += blktrace.o
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endif
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obj-$(CONFIG_EVENT_TRACING) += trace_events.o
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obj-$(CONFIG_EVENT_TRACING) += trace_export.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
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ifeq ($(CONFIG_PERF_EVENTS),y)
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obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
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endif
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obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
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obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
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obj-$(CONFIG_TRACEPOINTS) += power-traces.o
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ifeq ($(CONFIG_PM_RUNTIME),y)
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obj-$(CONFIG_TRACEPOINTS) += rpm-traces.o
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endif
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ifeq ($(CONFIG_TRACING),y)
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obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
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endif
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libftrace-y := ftrace.o
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