qemu/trace/control-internal.h
Markus Armbruster 13d4ff07e8 trace: Do not include qom/cpu.h into generated trace.h
docs/devel/tracing.txt explains "since many source files include
trace.h, [the generated trace.h use] a minimum of types and other
header files included to keep the namespace clean and compile times
and dependencies down."

Commit 4815185902 "trace: Add per-vCPU tracing states for events with
the 'vcpu' property" made them all include qom/cpu.h via
control-internal.h.  qom/cpu.h in turn includes about thirty headers.
Ouch.

Per-vCPU tracing is currently not supported in sub-directories'
trace-events.  In other words, qom/cpu.h can only be used in
trace-root.h, not in any trace.h.

Split trace/control-vcpu.h off trace/control.h and
trace/control-internal.h.  Have the generated trace.h include
trace/control.h (which no longer includes qom/cpu.h), and trace-root.h
include trace/control-vcpu.h (which includes it).

The resulting improvement is a bit disappointing: in my "build
everything" tree, some 1100 out of 6600 objects (not counting tests
and objects that don't depend on qemu/osdep.h) depend on a trace.h,
and about 600 of them no longer depend on qom/cpu.h.  But more than
1300 others depend on trace-root.h.  More work is clearly needed.
Left for another day.

Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190812052359.30071-8-armbru@redhat.com>
2019-08-16 13:31:52 +02:00

62 lines
1.4 KiB
C

/*
* Interface for configuring and controlling the state of tracing events.
*
* Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef TRACE__CONTROL_INTERNAL_H
#define TRACE__CONTROL_INTERNAL_H
extern int trace_events_enabled_count;
static inline bool trace_event_is_pattern(const char *str)
{
assert(str != NULL);
return strchr(str, '*') != NULL;
}
static inline uint32_t trace_event_get_id(TraceEvent *ev)
{
assert(ev != NULL);
return ev->id;
}
static inline uint32_t trace_event_get_vcpu_id(TraceEvent *ev)
{
return ev->vcpu_id;
}
static inline bool trace_event_is_vcpu(TraceEvent *ev)
{
return ev->vcpu_id != TRACE_VCPU_EVENT_NONE;
}
static inline const char * trace_event_get_name(TraceEvent *ev)
{
assert(ev != NULL);
return ev->name;
}
static inline bool trace_event_get_state_static(TraceEvent *ev)
{
assert(ev != NULL);
return ev->sstate;
}
/* it's on fast path, avoid consistency checks (asserts) */
#define trace_event_get_state_dynamic_by_id(id) \
(unlikely(trace_events_enabled_count) && _ ## id ## _DSTATE)
static inline bool trace_event_get_state_dynamic(TraceEvent *ev)
{
return unlikely(trace_events_enabled_count) && *ev->dstate;
}
void trace_event_register_group(TraceEvent **events);
#endif /* TRACE__CONTROL_INTERNAL_H */