Messages in this thread Patch in this message | | | Subject | [PATCH] tracing/kprobes: Add trace event trigger invocations | From | Tom Zanussi <> | Date | Sat, 28 Dec 2013 20:24:08 -0600 |
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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.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> --- kernel/trace/trace_kprobe.c | 42 ++++++++++++++++++++++++++++++++++++------ 1 file changed, 36 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index dae9541..1ee13eb 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -812,12 +812,20 @@ __kprobe_trace_func(struct trace_probe *tp, 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 = &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(); @@ -835,9 +843,16 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs, entry->ip = (unsigned long)tp->rp.kp.addr; store_trace_args(sizeof(*entry), 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 @@ -860,12 +875,20 @@ __kretprobe_trace_func(struct trace_probe *tp, 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 = &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(); @@ -884,9 +907,16 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri, entry->ret_ip = (unsigned long)ri->ret_addr; store_trace_args(sizeof(*entry), 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 -- 1.8.3.1
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