diff options
| -rw-r--r-- | Documentation/trace/ftrace.rst | 6 | ||||
| -rw-r--r-- | kernel/trace/trace.c | 3 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 1 |
3 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst index 87cf5c010d5d..62c98e9bbdd9 100644 --- a/Documentation/trace/ftrace.rst +++ b/Documentation/trace/ftrace.rst @@ -1159,6 +1159,12 @@ Here are the available options: This simulates the original behavior of the trace file. When the file is closed, tracing will be enabled again. + hash-ptr + When set, "%p" in the event printk format displays the + hashed pointer value instead of real address. + This will be useful if you want to find out which hashed + value is corresponding to the real value in trace log. + record-cmd When any event or tracer is enabled, a hook is enabled in the sched_switch trace point to fill comm cache diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 39f8a537196e..16e252d39016 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3558,6 +3558,9 @@ const char *trace_event_format(struct trace_iterator *iter, const char *fmt) if (WARN_ON_ONCE(!fmt)) return fmt; + if (iter->tr->trace_flags & TRACE_ITER_HASH_PTR) + return fmt; + p = fmt; new_fmt = q = iter->fmt; while (*p) { diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 6c3ea6f95e68..dec13ff66077 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -1175,6 +1175,7 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, C(MARKERS, "markers"), \ C(EVENT_FORK, "event-fork"), \ C(PAUSE_ON_TRACE, "pause-on-trace"), \ + C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ FUNCTION_FLAGS \ FGRAPH_FLAGS \ STACK_FLAGS \ |