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Message-ID: <1274143657.26328.666.camel@gandalf.stny.rr.com>
Date: Mon, 17 May 2010 20:47:37 -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: Re: Conflict between tip/tracing/core and tip/perf/core
Peter, Frederic,
Can I get either of your acked by here.
Thanks,
-- Steve
On Mon, 2010-05-17 at 14:50 -0400, Steven Rostedt wrote:
> 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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