To simplify the review of the next patches:
1. We are going to reimplent __perf_task/counter and embedd them
into TP_ARGS(). expand TRACE_EVENT(sched_stat_runtime) into
DECLARE_EVENT_CLASS() + DEFINE_EVENT(), this way they can use
different TP_ARGS's.
2. Change perf_trace_##call() macro to do perf_fetch_caller_regs()
right before perf_trace_buf_prepare().
This way it evaluates TP_ARGS() asap, the next patch explores
this fact.
Note: after 87f44bbc perf_trace_buf_prepare() doesn't need
"struct pt_regs *regs", perhaps it makes sense to remove this
argument. And perhaps we can teach perf_trace_buf_submit()
to accept regs == NULL and do fetch_caller_regs(CALLER_ADDR1)
in this case.
3. Cosmetic, but the typecast from "void*" buys nothing. It just
adds the noise, remove it.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
Tested-by: David Ahern <dsah...@gmail.com>
Reviewed-and-Acked-by: Steven Rostedt <rost...@goodmis.org>
---
include/trace/events/sched.h | 6 +++++-
include/trace/ftrace.h | 7 +++----
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index e5586ca..249c024 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -372,7 +372,7 @@ DEFINE_EVENT(sched_stat_template, sched_stat_blocked,
* Tracepoint for accounting runtime (time the task is executing
* on a CPU).
*/
-TRACE_EVENT(sched_stat_runtime,
+DECLARE_EVENT_CLASS(sched_stat_runtime,
TP_PROTO(struct task_struct *tsk, u64 runtime, u64 vruntime),
@@ -401,6 +401,10 @@ TRACE_EVENT(sched_stat_runtime,
(unsigned long long)__entry->vruntime)
);
+DEFINE_EVENT(sched_stat_runtime, sched_stat_runtime,
+ TP_PROTO(struct task_struct *tsk, u64 runtime, u64 vruntime),
+ TP_ARGS(tsk, runtime, vruntime));
+
/*
* Tracepoint for showing priority inheritance modifying a tasks
* priority.
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 41a6643..618af05 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -663,15 +663,14 @@ perf_trace_##call(void *__data, proto)
\
int __data_size; \
int rctx; \
\
- perf_fetch_caller_regs(&__regs); \
- \
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
sizeof(u64)); \
__entry_size -= sizeof(u32); \
\
- entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
- __entry_size, event_call->event.type, &__regs, &rctx); \
+ perf_fetch_caller_regs(&__regs); \
+ entry = perf_trace_buf_prepare(__entry_size, \
+ event_call->event.type, &__regs, &rctx); \
if (!entry) \
return; \
\
--
1.5.5.1
--
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