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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2014-04-08 17:26:21 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-04-08 20:43:28 -0400
commitde7b2973903c6cc50b31ee5682a69b2219b9919d (patch)
treea5b9d78102854b0073f5893cafb29920f8fb55e1 /kernel/trace/trace_kprobe.c
parent68114e5eb862ad0a7a261b91497281b026102715 (diff)
downloadlinux-de7b2973903c6cc50b31ee5682a69b2219b9919d.tar.bz2
tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints
Register/unregister tracepoint probes with struct tracepoint pointer rather than tracepoint name. This change, which vastly simplifies tracepoint.c, has been proposed by Steven Rostedt. It also removes 8.8kB (mostly of text) to the vmlinux size. From this point on, the tracers need to pass a struct tracepoint pointer to probe register/unregister. A probe can now only be connected to a tracepoint that exists. Moreover, tracers are responsible for unregistering the probe before the module containing its associated tracepoint is unloaded. text data bss dec hex filename 10443444 4282528 10391552 25117524 17f4354 vmlinux.orig 10434930 4282848 10391552 25109330 17f2352 vmlinux Link: http://lkml.kernel.org/r/1396992381-23785-2-git-send-email-mathieu.desnoyers@efficios.com CC: Ingo Molnar <mingo@kernel.org> CC: Frederic Weisbecker <fweisbec@gmail.com> CC: Andrew Morton <akpm@linux-foundation.org> CC: Frank Ch. Eigler <fche@redhat.com> CC: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> [ SDR - fixed return val in void func in tracepoint_module_going() ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
-rw-r--r--kernel/trace/trace_kprobe.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index d021d21dd150..903ae28962be 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -341,7 +341,7 @@ static struct trace_kprobe *find_trace_kprobe(const char *event,
struct trace_kprobe *tk;
list_for_each_entry(tk, &probe_list, list)
- if (strcmp(tk->tp.call.name, event) == 0 &&
+ if (strcmp(ftrace_event_name(&tk->tp.call), event) == 0 &&
strcmp(tk->tp.call.class->system, group) == 0)
return tk;
return NULL;
@@ -516,7 +516,8 @@ static int register_trace_kprobe(struct trace_kprobe *tk)
mutex_lock(&probe_lock);
/* Delete old (same name) event if exist */
- old_tk = find_trace_kprobe(tk->tp.call.name, tk->tp.call.class->system);
+ old_tk = find_trace_kprobe(ftrace_event_name(&tk->tp.call),
+ tk->tp.call.class->system);
if (old_tk) {
ret = unregister_trace_kprobe(old_tk);
if (ret < 0)
@@ -564,7 +565,8 @@ static int trace_kprobe_module_callback(struct notifier_block *nb,
if (ret)
pr_warning("Failed to re-register probe %s on"
"%s: %d\n",
- tk->tp.call.name, mod->name, ret);
+ ftrace_event_name(&tk->tp.call),
+ mod->name, ret);
}
}
mutex_unlock(&probe_lock);
@@ -818,7 +820,8 @@ static int probes_seq_show(struct seq_file *m, void *v)
int i;
seq_printf(m, "%c", trace_kprobe_is_return(tk) ? 'r' : 'p');
- seq_printf(m, ":%s/%s", tk->tp.call.class->system, tk->tp.call.name);
+ seq_printf(m, ":%s/%s", tk->tp.call.class->system,
+ ftrace_event_name(&tk->tp.call));
if (!tk->symbol)
seq_printf(m, " 0x%p", tk->rp.kp.addr);
@@ -876,7 +879,8 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
{
struct trace_kprobe *tk = v;
- seq_printf(m, " %-44s %15lu %15lu\n", tk->tp.call.name, tk->nhit,
+ seq_printf(m, " %-44s %15lu %15lu\n",
+ ftrace_event_name(&tk->tp.call), tk->nhit,
tk->rp.kp.nmissed);
return 0;
@@ -1011,7 +1015,7 @@ print_kprobe_event(struct trace_iterator *iter, int flags,
field = (struct kprobe_trace_entry_head *)iter->ent;
tp = container_of(event, struct trace_probe, call.event);
- if (!trace_seq_printf(s, "%s: (", tp->call.name))
+ if (!trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call)))
goto partial;
if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
@@ -1047,7 +1051,7 @@ print_kretprobe_event(struct trace_iterator *iter, int flags,
field = (struct kretprobe_trace_entry_head *)iter->ent;
tp = container_of(event, struct trace_probe, call.event);
- if (!trace_seq_printf(s, "%s: (", tp->call.name))
+ if (!trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call)))
goto partial;
if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET))
@@ -1286,7 +1290,8 @@ static int register_kprobe_event(struct trace_kprobe *tk)
call->data = tk;
ret = trace_add_event_call(call);
if (ret) {
- pr_info("Failed to register kprobe event: %s\n", call->name);
+ pr_info("Failed to register kprobe event: %s\n",
+ ftrace_event_name(call));
kfree(call->print_fmt);
unregister_ftrace_event(&call->event);
}