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authorTom Zanussi <tom.zanussi@linux.intel.com>2014-01-06 13:44:19 -0600
committerSteven Rostedt <rostedt@goodmis.org>2014-01-06 15:21:43 -0500
commit0641d368f206f2fe7725c9fa5f1461229ef8010f (patch)
treeaac0db92d00b238236cbe64d562ff83f8978bb18 /kernel/trace
parente0d18fe063464cb3f1a6d1939e4fcf47d92d8386 (diff)
downloadop-kernel-dev-0641d368f206f2fe7725c9fa5f1461229ef8010f.zip
op-kernel-dev-0641d368f206f2fe7725c9fa5f1461229ef8010f.tar.gz
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>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_kprobe.c42
1 files changed, 36 insertions, 6 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index ce0ed8a..3afa716 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
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