tracing, perf: Convert the power tracer into an event tracer
This patch converts the existing power tracer into an event tracer,
so that power events (C states and frequency changes) can be
tracked via "perf".
This also removes the perl script that was used to demo the tracer;
its functionality is being replaced entirely with timechart.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20090912130542.6d314860@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/trace/power.txt b/Documentation/trace/power.txt
deleted file mode 100644
index cd805e1..0000000
--- a/Documentation/trace/power.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-The power tracer collects detailed information about C-state and P-state
-transitions, instead of just looking at the high-level "average"
-information.
-
-There is a helper script found in scrips/tracing/power.pl in the kernel
-sources which can be used to parse this information and create a
-Scalable Vector Graphics (SVG) picture from the trace data.
-
-To use this tracer:
-
- echo 0 > /sys/kernel/debug/tracing/tracing_enabled
- echo power > /sys/kernel/debug/tracing/current_tracer
- echo 1 > /sys/kernel/debug/tracing/tracing_enabled
- sleep 1
- echo 0 > /sys/kernel/debug/tracing/tracing_enabled
- cat /sys/kernel/debug/tracing/trace | \
- perl scripts/tracing/power.pl > out.sv
diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index 4109679..479cc8c 100644
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -33,7 +33,7 @@
#include <linux/cpufreq.h>
#include <linux/compiler.h>
#include <linux/dmi.h>
-#include <trace/power.h>
+#include <trace/events/power.h>
#include <linux/acpi.h>
#include <linux/io.h>
@@ -72,8 +72,6 @@
static DEFINE_PER_CPU(struct aperfmperf, old_perf);
-DEFINE_TRACE(power_mark);
-
/* acpi_perf_data is a pointer to percpu data. */
static struct acpi_processor_performance *acpi_perf_data;
@@ -332,7 +330,6 @@
unsigned int next_perf_state = 0; /* Index into perf table */
unsigned int i;
int result = 0;
- struct power_trace it;
dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
@@ -364,7 +361,7 @@
}
}
- trace_power_mark(&it, POWER_PSTATE, next_perf_state);
+ trace_power_frequency(POWER_PSTATE, data->freq_table[next_state].frequency);
switch (data->cpu_feature) {
case SYSTEM_INTEL_MSR_CAPABLE:
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 071166a..7b60e39 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -9,7 +9,7 @@
#include <linux/pm.h>
#include <linux/clockchips.h>
#include <linux/random.h>
-#include <trace/power.h>
+#include <trace/events/power.h>
#include <asm/system.h>
#include <asm/apic.h>
#include <asm/syscalls.h>
@@ -25,9 +25,6 @@
struct kmem_cache *task_xstate_cachep;
-DEFINE_TRACE(power_start);
-DEFINE_TRACE(power_end);
-
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
*dst = *src;
@@ -299,9 +296,7 @@
void default_idle(void)
{
if (hlt_use_halt()) {
- struct power_trace it;
-
- trace_power_start(&it, POWER_CSTATE, 1);
+ trace_power_start(POWER_CSTATE, 1);
current_thread_info()->status &= ~TS_POLLING;
/*
* TS_POLLING-cleared state must be visible before we
@@ -314,7 +309,7 @@
else
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
- trace_power_end(&it);
+ trace_power_end(0);
} else {
local_irq_enable();
/* loop is done by the caller */
@@ -372,9 +367,7 @@
*/
void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
{
- struct power_trace it;
-
- trace_power_start(&it, POWER_CSTATE, (ax>>4)+1);
+ trace_power_start(POWER_CSTATE, (ax>>4)+1);
if (!need_resched()) {
if (cpu_has(¤t_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
clflush((void *)¤t_thread_info()->flags);
@@ -384,15 +377,14 @@
if (!need_resched())
__mwait(ax, cx);
}
- trace_power_end(&it);
+ trace_power_end(0);
}
/* Default MONITOR/MWAIT with no hints, used for default C1 state */
static void mwait_idle(void)
{
- struct power_trace it;
if (!need_resched()) {
- trace_power_start(&it, POWER_CSTATE, 1);
+ trace_power_start(POWER_CSTATE, 1);
if (cpu_has(¤t_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
clflush((void *)¤t_thread_info()->flags);
@@ -402,7 +394,7 @@
__sti_mwait(0, 0);
else
local_irq_enable();
- trace_power_end(&it);
+ trace_power_end(0);
} else
local_irq_enable();
}
@@ -414,13 +406,11 @@
*/
static void poll_idle(void)
{
- struct power_trace it;
-
- trace_power_start(&it, POWER_CSTATE, 0);
+ trace_power_start(POWER_CSTATE, 0);
local_irq_enable();
while (!need_resched())
cpu_relax();
- trace_power_end(&it);
+ trace_power_end(0);
}
/*
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
new file mode 100644
index 0000000..ea6d579
--- /dev/null
+++ b/include/trace/events/power.h
@@ -0,0 +1,81 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM power
+
+#if !defined(_TRACE_POWER_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_POWER_H
+
+#include <linux/ktime.h>
+#include <linux/tracepoint.h>
+
+#ifndef _TRACE_POWER_ENUM_
+#define _TRACE_POWER_ENUM_
+enum {
+ POWER_NONE = 0,
+ POWER_CSTATE = 1,
+ POWER_PSTATE = 2,
+};
+#endif
+
+
+
+TRACE_EVENT(power_start,
+
+ TP_PROTO(unsigned int type, unsigned int state),
+
+ TP_ARGS(type, state),
+
+ TP_STRUCT__entry(
+ __field( u64, type )
+ __field( u64, state )
+ ),
+
+ TP_fast_assign(
+ __entry->type = type;
+ __entry->state = state;
+ ),
+
+ TP_printk("type=%lu state=%lu", (unsigned long)__entry->type, (unsigned long)__entry->state)
+);
+
+TRACE_EVENT(power_end,
+
+ TP_PROTO(int dummy),
+
+ TP_ARGS(dummy),
+
+ TP_STRUCT__entry(
+ __field( u64, dummy )
+ ),
+
+ TP_fast_assign(
+ __entry->dummy = 0xffff;
+ ),
+
+ TP_printk("dummy=%lu", (unsigned long)__entry->dummy)
+
+);
+
+
+TRACE_EVENT(power_frequency,
+
+ TP_PROTO(unsigned int type, unsigned int state),
+
+ TP_ARGS(type, state),
+
+ TP_STRUCT__entry(
+ __field( u64, type )
+ __field( u64, state )
+ ),
+
+ TP_fast_assign(
+ __entry->type = type;
+ __entry->state = state;
+ ),
+
+ TP_printk("type=%lu state=%lu", (unsigned long)__entry->type, (unsigned long) __entry->state)
+);
+
+#endif /* _TRACE_POWER_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 844164d..26f03ac 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -42,7 +42,6 @@
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
-obj-$(CONFIG_POWER_TRACER) += trace_power.o
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
@@ -54,5 +53,6 @@
obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
obj-$(CONFIG_EVENT_PROFILE) += trace_event_profile.o
obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
+obj-$(CONFIG_EVENT_TRACING) += power-traces.o
libftrace-y := ftrace.o
diff --git a/kernel/trace/power-traces.c b/kernel/trace/power-traces.c
new file mode 100644
index 0000000..e06c6e3
--- /dev/null
+++ b/kernel/trace/power-traces.c
@@ -0,0 +1,20 @@
+/*
+ * Power trace points
+ *
+ * Copyright (C) 2009 Arjan van de Ven <arjan@linux.intel.com>
+ */
+
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/power.h>
+
+EXPORT_TRACEPOINT_SYMBOL_GPL(power_start);
+EXPORT_TRACEPOINT_SYMBOL_GPL(power_end);
+EXPORT_TRACEPOINT_SYMBOL_GPL(power_frequency);
+
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 86bcff9..405cb85 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -11,7 +11,6 @@
#include <linux/ftrace.h>
#include <trace/boot.h>
#include <linux/kmemtrace.h>
-#include <trace/power.h>
#include <linux/trace_seq.h>
#include <linux/ftrace_event.h>
@@ -37,7 +36,6 @@
TRACE_HW_BRANCHES,
TRACE_KMEM_ALLOC,
TRACE_KMEM_FREE,
- TRACE_POWER,
TRACE_BLK,
__TRACE_LAST_TYPE,
@@ -207,7 +205,6 @@
IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
TRACE_GRAPH_RET); \
IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
- IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
TRACE_KMEM_ALLOC); \
IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index a431748..ead3d72 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -330,23 +330,6 @@
F_printk("from: %llx to: %llx", __entry->from, __entry->to)
);
-FTRACE_ENTRY(power, trace_power,
-
- TRACE_POWER,
-
- F_STRUCT(
- __field_struct( struct power_trace, state_data )
- __field_desc( s64, state_data, stamp )
- __field_desc( s64, state_data, end )
- __field_desc( int, state_data, type )
- __field_desc( int, state_data, state )
- ),
-
- F_printk("%llx->%llx type:%u state:%u",
- __entry->stamp, __entry->end,
- __entry->type, __entry->state)
-);
-
FTRACE_ENTRY(kmem_alloc, kmemtrace_alloc_entry,
TRACE_KMEM_ALLOC,
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
deleted file mode 100644
index fe1a00f..0000000
--- a/kernel/trace/trace_power.c
+++ /dev/null
@@ -1,218 +0,0 @@
-/*
- * ring buffer based C-state tracer
- *
- * Arjan van de Ven <arjan@linux.intel.com>
- * Copyright (C) 2008 Intel Corporation
- *
- * Much is borrowed from trace_boot.c which is
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- *
- */
-
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <trace/power.h>
-#include <linux/kallsyms.h>
-#include <linux/module.h>
-
-#include "trace.h"
-#include "trace_output.h"
-
-static struct trace_array *power_trace;
-static int __read_mostly trace_power_enabled;
-
-static void probe_power_start(struct power_trace *it, unsigned int type,
- unsigned int level)
-{
- if (!trace_power_enabled)
- return;
-
- memset(it, 0, sizeof(struct power_trace));
- it->state = level;
- it->type = type;
- it->stamp = ktime_get();
-}
-
-
-static void probe_power_end(struct power_trace *it)
-{
- struct ftrace_event_call *call = &event_power;
- struct ring_buffer_event *event;
- struct ring_buffer *buffer;
- struct trace_power *entry;
- struct trace_array_cpu *data;
- struct trace_array *tr = power_trace;
-
- if (!trace_power_enabled)
- return;
-
- buffer = tr->buffer;
-
- preempt_disable();
- it->end = ktime_get();
- data = tr->data[smp_processor_id()];
-
- event = trace_buffer_lock_reserve(buffer, TRACE_POWER,
- sizeof(*entry), 0, 0);
- if (!event)
- goto out;
- entry = ring_buffer_event_data(event);
- entry->state_data = *it;
- if (!filter_check_discard(call, entry, buffer, event))
- trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
- preempt_enable();
-}
-
-static void probe_power_mark(struct power_trace *it, unsigned int type,
- unsigned int level)
-{
- struct ftrace_event_call *call = &event_power;
- struct ring_buffer_event *event;
- struct ring_buffer *buffer;
- struct trace_power *entry;
- struct trace_array_cpu *data;
- struct trace_array *tr = power_trace;
-
- if (!trace_power_enabled)
- return;
-
- buffer = tr->buffer;
-
- memset(it, 0, sizeof(struct power_trace));
- it->state = level;
- it->type = type;
- it->stamp = ktime_get();
- preempt_disable();
- it->end = it->stamp;
- data = tr->data[smp_processor_id()];
-
- event = trace_buffer_lock_reserve(buffer, TRACE_POWER,
- sizeof(*entry), 0, 0);
- if (!event)
- goto out;
- entry = ring_buffer_event_data(event);
- entry->state_data = *it;
- if (!filter_check_discard(call, entry, buffer, event))
- trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
- preempt_enable();
-}
-
-static int tracing_power_register(void)
-{
- int ret;
-
- ret = register_trace_power_start(probe_power_start);
- if (ret) {
- pr_info("power trace: Couldn't activate tracepoint"
- " probe to trace_power_start\n");
- return ret;
- }
- ret = register_trace_power_end(probe_power_end);
- if (ret) {
- pr_info("power trace: Couldn't activate tracepoint"
- " probe to trace_power_end\n");
- goto fail_start;
- }
- ret = register_trace_power_mark(probe_power_mark);
- if (ret) {
- pr_info("power trace: Couldn't activate tracepoint"
- " probe to trace_power_mark\n");
- goto fail_end;
- }
- return ret;
-fail_end:
- unregister_trace_power_end(probe_power_end);
-fail_start:
- unregister_trace_power_start(probe_power_start);
- return ret;
-}
-
-static void start_power_trace(struct trace_array *tr)
-{
- trace_power_enabled = 1;
-}
-
-static void stop_power_trace(struct trace_array *tr)
-{
- trace_power_enabled = 0;
-}
-
-static void power_trace_reset(struct trace_array *tr)
-{
- trace_power_enabled = 0;
- unregister_trace_power_start(probe_power_start);
- unregister_trace_power_end(probe_power_end);
- unregister_trace_power_mark(probe_power_mark);
-}
-
-
-static int power_trace_init(struct trace_array *tr)
-{
- power_trace = tr;
-
- trace_power_enabled = 1;
- tracing_power_register();
-
- tracing_reset_online_cpus(tr);
- return 0;
-}
-
-static enum print_line_t power_print_line(struct trace_iterator *iter)
-{
- int ret = 0;
- struct trace_entry *entry = iter->ent;
- struct trace_power *field ;
- struct power_trace *it;
- struct trace_seq *s = &iter->seq;
- struct timespec stamp;
- struct timespec duration;
-
- trace_assign_type(field, entry);
- it = &field->state_data;
- stamp = ktime_to_timespec(it->stamp);
- duration = ktime_to_timespec(ktime_sub(it->end, it->stamp));
-
- if (entry->type == TRACE_POWER) {
- if (it->type == POWER_CSTATE)
- ret = trace_seq_printf(s, "[%5ld.%09ld] CSTATE: Going to C%i on cpu %i for %ld.%09ld\n",
- stamp.tv_sec,
- stamp.tv_nsec,
- it->state, iter->cpu,
- duration.tv_sec,
- duration.tv_nsec);
- if (it->type == POWER_PSTATE)
- ret = trace_seq_printf(s, "[%5ld.%09ld] PSTATE: Going to P%i on cpu %i\n",
- stamp.tv_sec,
- stamp.tv_nsec,
- it->state, iter->cpu);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- return TRACE_TYPE_HANDLED;
- }
- return TRACE_TYPE_UNHANDLED;
-}
-
-static void power_print_header(struct seq_file *s)
-{
- seq_puts(s, "# TIMESTAMP STATE EVENT\n");
- seq_puts(s, "# | | |\n");
-}
-
-static struct tracer power_tracer __read_mostly =
-{
- .name = "power",
- .init = power_trace_init,
- .start = start_power_trace,
- .stop = stop_power_trace,
- .reset = power_trace_reset,
- .print_line = power_print_line,
- .print_header = power_print_header,
-};
-
-static int init_power_trace(void)
-{
- return register_tracer(&power_tracer);
-}
-device_initcall(init_power_trace);
diff --git a/scripts/tracing/power.pl b/scripts/tracing/power.pl
deleted file mode 100644
index 4f729b3..0000000
--- a/scripts/tracing/power.pl
+++ /dev/null
@@ -1,108 +0,0 @@
-#!/usr/bin/perl
-
-# Copyright 2008, Intel Corporation
-#
-# This file is part of the Linux kernel
-#
-# This program file is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the
-# Free Software Foundation; version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-# for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program in a file named COPYING; if not, write to the
-# Free Software Foundation, Inc.,
-# 51 Franklin Street, Fifth Floor,
-# Boston, MA 02110-1301 USA
-#
-# Authors:
-# Arjan van de Ven <arjan@linux.intel.com>
-
-
-#
-# This script turns a cstate ftrace output into a SVG graphic that shows
-# historic C-state information
-#
-#
-# cat /sys/kernel/debug/tracing/trace | perl power.pl > out.svg
-#
-
-my @styles;
-my $base = 0;
-
-my @pstate_last;
-my @pstate_level;
-
-$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-$styles[8] = "fill:rgb(0,25,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
-
-
-print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
-print "<svg width=\"10000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
-
-my $scale = 30000.0;
-while (<>) {
- my $line = $_;
- if ($line =~ /([0-9\.]+)\] CSTATE: Going to C([0-9]) on cpu ([0-9]+) for ([0-9\.]+)/) {
- if ($base == 0) {
- $base = $1;
- }
- my $time = $1 - $base;
- $time = $time * $scale;
- my $C = $2;
- my $cpu = $3;
- my $y = 400 * $cpu;
- my $duration = $4 * $scale;
- my $msec = int($4 * 100000)/100.0;
- my $height = $C * 20;
- $style = $styles[$C];
-
- $y = $y + 140 - $height;
-
- $x2 = $time + 4;
- $y2 = $y + 4;
-
-
- print "<rect x=\"$time\" width=\"$duration\" y=\"$y\" height=\"$height\" style=\"$style\"/>\n";
- print "<text transform=\"translate($x2,$y2) rotate(90)\">C$C $msec</text>\n";
- }
- if ($line =~ /([0-9\.]+)\] PSTATE: Going to P([0-9]) on cpu ([0-9]+)/) {
- my $time = $1 - $base;
- my $state = $2;
- my $cpu = $3;
-
- if (defined($pstate_last[$cpu])) {
- my $from = $pstate_last[$cpu];
- my $oldstate = $pstate_state[$cpu];
- my $duration = ($time-$from) * $scale;
-
- $from = $from * $scale;
- my $to = $from + $duration;
- my $height = 140 - ($oldstate * (140/8));
-
- my $y = 400 * $cpu + 200 + $height;
- my $y2 = $y+4;
- my $style = $styles[8];
-
- print "<rect x=\"$from\" y=\"$y\" width=\"$duration\" height=\"5\" style=\"$style\"/>\n";
- print "<text transform=\"translate($from,$y2)\">P$oldstate (cpu $cpu)</text>\n";
- };
-
- $pstate_last[$cpu] = $time;
- $pstate_state[$cpu] = $state;
- }
-}
-
-
-print "</svg>\n";