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| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2013-05-09 14:44:54 +0900 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-05-09 20:22:16 -0400 |
| commit | b8820084f2130b3dcfb09c78ac16cdd2194a345b (patch) | |
| tree | 5cfc6d47197adcbebff40c42fc17fea8d6246887 /kernel | |
| parent | 41a7dd420c57323391d58b553318c1fad8e7ebc2 (diff) | |
| download | lwn-b8820084f2130b3dcfb09c78ac16cdd2194a345b.tar.gz lwn-b8820084f2130b3dcfb09c78ac16cdd2194a345b.zip | |
tracing/kprobes: Support soft-mode disabling
Support soft-mode disabling on kprobe-based dynamic events.
Soft-disabling is just ignoring recording if the soft disabled
flag is set.
Link: http://lkml.kernel.org/r/20130509054454.30398.7237.stgit@mhiramat-M0-7522
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Tom Zanussi <tom.zanussi@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index fee865d8a7c4..636d45fe69b3 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -845,6 +845,9 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs, WARN_ON(call != ftrace_file->event_call); + if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) + return; + local_save_flags(irq_flags); pc = preempt_count(); @@ -893,6 +896,9 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri, WARN_ON(call != ftrace_file->event_call); + if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) + return; + local_save_flags(irq_flags); pc = preempt_count(); |