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tracing: Move synthetic events to a separate file

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With the addition of the in-kernel synthetic event API, synthetic
events are no longer specifically tied to the histogram triggers.

The synthetic event code is also making trace_event_hist.c very
bloated, so for those reasons, move it to a separate file,
trace_events_synth.c, along with a new trace_synth.h header file.

Because synthetic events are now independent from hist triggers, add a
new CONFIG_SYNTH_EVENTS config option, and have CONFIG_HIST_TRIGGERS
select it, and have CONFIG_SYNTH_EVENT_GEN_TEST depend on it.

Link: http://lkml.kernel.org/r/4d1fa1f85ed5982706ac44844ac92451dcb04715.1590693308.git.zanussi@kernel.org

Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2020-05-28 14:32:37 -05:00 committed by Steven Rostedt (VMware)
parent 5bbf959de4
commit 726721a518
5 changed files with 1847 additions and 1786 deletions
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20
kernel/trace/Kconfig
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@ -623,12 +623,30 @@ config TRACING_MAP
generally used outside of that context, and is normally
selected by tracers that use it.
config SYNTH_EVENTS
bool "Synthetic trace events"
select TRACING
select DYNAMIC_EVENTS
default n
help
Synthetic events are user-defined trace events that can be
used to combine data from other trace events or in fact any
data source. Synthetic events can be generated indirectly
via the trace() action of histogram triggers or directly
by way of an in-kernel API.
See Documentation/trace/events.rst or
Documentation/trace/histogram.rst for details and examples.
If in doubt, say N.
config HIST_TRIGGERS
bool "Histogram triggers"
depends on ARCH_HAVE_NMI_SAFE_CMPXCHG
select TRACING_MAP
select TRACING
select DYNAMIC_EVENTS
select SYNTH_EVENTS
default n
help
Hist triggers allow one or more arbitrary trace event fields
@ -824,7 +842,7 @@ config PREEMPTIRQ_DELAY_TEST
config SYNTH_EVENT_GEN_TEST
tristate "Test module for in-kernel synthetic event generation"
depends on HIST_TRIGGERS
depends on SYNTH_EVENTS
help
This option creates a test module to check the base
functionality of in-kernel synthetic event definition and

1
kernel/trace/Makefile
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@ -72,6 +72,7 @@ endif
obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
obj-$(CONFIG_EVENT_TRACING) += trace_events_trigger.o
obj-$(CONFIG_TRACE_EVENT_INJECT) += trace_events_inject.o
obj-$(CONFIG_SYNTH_EVENTS) += trace_events_synth.o
obj-$(CONFIG_HIST_TRIGGERS) += trace_events_hist.o
obj-$(CONFIG_BPF_EVENTS) += bpf_trace.o
obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe.o

1787
kernel/trace/trace_events_hist.c
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File diff suppressed because it is too large Load Diff

1789
kernel/trace/trace_events_synth.c Normal file
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File diff suppressed because it is too large Load Diff

36
kernel/trace/trace_synth.h Normal file
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@ -0,0 +1,36 @@
// SPDX-License-Identifier: GPL-2.0
#ifndef __TRACE_SYNTH_H
#define __TRACE_SYNTH_H
#include "trace_dynevent.h"
#define SYNTH_SYSTEM "synthetic"
#define SYNTH_FIELDS_MAX 32
#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
struct synth_field {
char *type;
char *name;
size_t size;
unsigned int offset;
bool is_signed;
bool is_string;
};
struct synth_event {
struct dyn_event devent;
int ref;
char *name;
struct synth_field **fields;
unsigned int n_fields;
unsigned int n_u64;
struct trace_event_class class;
struct trace_event_call call;
struct tracepoint *tp;
struct module *mod;
};
extern struct synth_event *find_synth_event(const char *name);
#endif /* __TRACE_SYNTH_H */