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tracing/kprobes: Add trace event trigger invocations 

Add code to the kprobe/kretprobe event functions that will invoke any
event triggers associated with a probe's ftrace_event_file.

The code to do this is very similar to the invocation code already
used to invoke the triggers associated with static events and
essentially replaces the existing soft-disable checks with a superset
that preserves the original behavior but adds the bits needed to
support event triggers.

Link: http://lkml.kernel.org/r/f2d49f157b608070045fdb26c9564d5a05a5a7d0.1389036657.git.tom.zanussi@linux.intel.com

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2014-01-06 13:44:19 -06:00 committed by Steven Rostedt
parent e0d18fe063
commit 0641d368f2
1 changed files with 36 additions and 6 deletions
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42
kernel/trace/trace_kprobe.c
View File

@ -929,12 +929,20 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
struct ring_buffer *buffer;
int size, dsize, pc;
unsigned long irq_flags;
unsigned long eflags;
enum event_trigger_type tt = ETT_NONE;
struct ftrace_event_call *call = &tk->tp.call;
WARN_ON(call != ftrace_file->event_call);
if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
return;
eflags = ftrace_file->flags;
if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
event_triggers_call(ftrace_file, NULL);
if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
return;
}
local_save_flags(irq_flags);
pc = preempt_count();
@ -952,9 +960,16 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
entry->ip = (unsigned long)tk->rp.kp.addr;
store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
if (!filter_check_discard(ftrace_file, entry, buffer, event))
if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
tt = event_triggers_call(ftrace_file, entry);
if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
ring_buffer_discard_commit(buffer, event);
else if (!filter_check_discard(ftrace_file, entry, buffer, event))
trace_buffer_unlock_commit_regs(buffer, event,
irq_flags, pc, regs);
if (tt)
event_triggers_post_call(ftrace_file, tt);
}
static __kprobes void
@ -977,12 +992,20 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
struct ring_buffer *buffer;
int size, pc, dsize;
unsigned long irq_flags;
unsigned long eflags;
enum event_trigger_type tt = ETT_NONE;
struct ftrace_event_call *call = &tk->tp.call;
WARN_ON(call != ftrace_file->event_call);
if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
return;
eflags = ftrace_file->flags;
if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
event_triggers_call(ftrace_file, NULL);
if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
return;
}
local_save_flags(irq_flags);
pc = preempt_count();
@ -1001,9 +1024,16 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
entry->ret_ip = (unsigned long)ri->ret_addr;
store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize);
if (!filter_check_discard(ftrace_file, entry, buffer, event))
if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
tt = event_triggers_call(ftrace_file, entry);
if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
ring_buffer_discard_commit(buffer, event);
else if (!filter_check_discard(ftrace_file, entry, buffer, event))
trace_buffer_unlock_commit_regs(buffer, event,
irq_flags, pc, regs);
if (tt)
event_triggers_post_call(ftrace_file, tt);
}
static __kprobes void