diff options
| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2014-01-06 23:44:19 +0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-01-07 00:21:43 +0400 |
| commit | 0641d368f206f2fe7725c9fa5f1461229ef8010f (patch) | |
| tree | aac0db92d00b238236cbe64d562ff83f8978bb18 | |
| parent | e0d18fe063464cb3f1a6d1939e4fcf47d92d8386 (diff) | |
| download | linux-0641d368f206f2fe7725c9fa5f1461229ef8010f.tar.xz | |
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>
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index ce0ed8afb77e..3afa716d6268 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -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 |