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Date: Mon, 17 May 2010 14:50:42 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
Ingo Molnar <mingo@...e.hu>
Subject: Conflict between tip/tracing/core and tip/perf/core
Hi,
Ingo asked me to resolve a conflict between tip/tracing/core and
perf/core, and I came up with the below solution.
The conflict stems from the shrinking of TRACE_EVENT(), which affects
both ftrace and perf (saves size on both too). It conflicts with:
6cc8a7c1d8560c042f486b23318a6291569ab96b
Author: Frederic Weisbecker <fweisbec@...il.com>
Date: Fri Mar 19 01:23:53 2010 +0100
perf: Fetch hot regs from the template caller
The shrinking code removed the per event caller to the template
(TRACE_CLASS). This was done because the shrinking code allows the trace
event to be passed to the tracepoint probe, and removed the need to have
a separate function for every event because the class can now have the
event passed to it.
The conflicting code added the regs to the per event probe, which no
longer exists.
Masami,
It also conflicted with the kprobe code, which is also in the fix up.
Here's my conflict resolution:
is everyone fine with it?
-- Steve
diff --cc include/trace/ftrace.h
index 4866c10,882c648..0000000
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@@ -690,18 -757,17 +690,20 @@@ __attribute__((section("_ftrace_events"
#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
static notrace void \
-perf_trace_templ_##call(struct ftrace_event_call *event_call, \
- struct pt_regs *__regs, proto) \
+perf_trace_##call(void *__data, proto) \
{ \
+ struct ftrace_event_call *event_call = __data; \
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
struct ftrace_raw_##call *entry; \
++ struct pt_regs *__regs = &get_cpu_var(perf_trace_regs); \
u64 __addr = 0, __count = 1; \
unsigned long irq_flags; \
- struct pt_regs *__regs; \
int __entry_size; \
int __data_size; \
int rctx; \
\
++ perf_fetch_caller_regs(__regs, 1); \
++ \
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
sizeof(u64)); \
@@@ -718,27 -784,24 +720,25 @@@
\
{ assign; } \
\
- __regs = &__get_cpu_var(perf_trace_regs); \
- perf_fetch_caller_regs(__regs, 2); \
- \
perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
__count, irq_flags, __regs); \
++ put_cpu_var(perf_trace_regs); \
}
+/*
+ * This part is compiled out, it is only here as a build time check
+ * to make sure that if the tracepoint handling changes, the
+ * perf probe will fail to compile unless it too is updated.
+ */
#undef DEFINE_EVENT
#define DEFINE_EVENT(template, call, proto, args) \
-static notrace void perf_trace_##call(proto) \
+static inline void perf_test_probe_##call(void) \
{ \
- struct ftrace_event_call *event_call = &event_##call; \
- struct pt_regs *__regs = &get_cpu_var(perf_trace_regs); \
- \
- perf_fetch_caller_regs(__regs, 1); \
+ check_trace_callback_type_##call(perf_trace_##template); \
\
- perf_trace_templ_##template(event_call, __regs, args); \
- \
- put_cpu_var(perf_trace_regs); \
}
+
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
diff --cc kernel/trace/trace_kprobe.c
index 0e3ded6,a751432..0000000
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@@ -202,8 -324,9 +324,9 @@@ struct trace_probe
unsigned long nhit;
unsigned int flags; /* For TP_FLAG_* */
const char *symbol; /* symbol name */
+ struct ftrace_event_class class;
struct ftrace_event_call call;
- struct trace_event event;
+ ssize_t size; /* trace entry size */
unsigned int nr_args;
struct probe_arg args[];
};
@@@ -795,11 -901,10 +902,10 @@@ static void probes_seq_stop(struct seq_
static int probes_seq_show(struct seq_file *m, void *v)
{
struct trace_probe *tp = v;
- int i, ret;
- char buf[MAX_ARGSTR_LEN + 1];
+ int i;
seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p');
- seq_printf(m, ":%s/%s", tp->call.system, tp->call.name);
+ seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name);
if (!tp->symbol)
seq_printf(m, " 0x%p", tp->rp.kp.addr);
@@@ -958,10 -1059,10 +1060,10 @@@ static __kprobes void kprobe_trace_func
local_save_flags(irq_flags);
pc = preempt_count();
- size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
+ size = sizeof(*entry) + tp->size;
- event = trace_current_buffer_lock_reserve(&buffer, call->id, size,
- irq_flags, pc);
+ event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
+ size, irq_flags, pc);
if (!event)
return;
@@@ -990,10 -1092,10 +1093,10 @@@ static __kprobes void kretprobe_trace_f
local_save_flags(irq_flags);
pc = preempt_count();
- size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
+ size = sizeof(*entry) + tp->size;
- event = trace_current_buffer_lock_reserve(&buffer, call->id, size,
- irq_flags, pc);
+ event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
+ size, irq_flags, pc);
if (!event)
return;
@@@ -1010,16 -1112,18 +1113,17 @@@
/* Event entry printers */
enum print_line_t
-print_kprobe_event(struct trace_iterator *iter, int flags)
+print_kprobe_event(struct trace_iterator *iter, int flags,
+ struct trace_event *event)
{
- struct kprobe_trace_entry *field;
+ struct kprobe_trace_entry_head *field;
struct trace_seq *s = &iter->seq;
- struct trace_event *event;
struct trace_probe *tp;
+ u8 *data;
int i;
- field = (struct kprobe_trace_entry *)iter->ent;
+ field = (struct kprobe_trace_entry_head *)iter->ent;
- event = ftrace_find_event(field->ent.type);
- tp = container_of(event, struct trace_probe, event);
+ tp = container_of(event, struct trace_probe, call.event);
if (!trace_seq_printf(s, "%s: (", tp->call.name))
goto partial;
@@@ -1044,16 -1149,18 +1149,17 @@@ partial
}
enum print_line_t
-print_kretprobe_event(struct trace_iterator *iter, int flags)
+print_kretprobe_event(struct trace_iterator *iter, int flags,
+ struct trace_event *event)
{
- struct kretprobe_trace_entry *field;
+ struct kretprobe_trace_entry_head *field;
struct trace_seq *s = &iter->seq;
- struct trace_event *event;
struct trace_probe *tp;
+ u8 *data;
int i;
- field = (struct kretprobe_trace_entry *)iter->ent;
+ field = (struct kretprobe_trace_entry_head *)iter->ent;
- event = ftrace_find_event(field->ent.type);
- tp = container_of(event, struct trace_probe, event);
+ tp = container_of(event, struct trace_probe, call.event);
if (!trace_seq_printf(s, "%s: (", tp->call.name))
goto partial;
--
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