summaryrefslogtreecommitdiff
path: root/kernel/trace/trace.h
diff options
context:
space:
mode:
authorMarkus Metzger <markus.t.metzger@intel.com>2008-11-25 09:24:15 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-25 17:31:13 +0100
commit1e9b51c28312f7334394aa30be56ff52c2b65b7e (patch)
treec0a231d83541263ee938e3452475409323e4e9a9 /kernel/trace/trace.h
parent8bba1bf5e2434c83f2fe8b1422604ace9bbe4cb8 (diff)
x86, bts, ftrace: a BTS ftrace plug-in prototype
Impact: add new ftrace plugin A prototype for a BTS ftrace plug-in. The tracer collects branch trace in a cyclic buffer for each cpu. The tracer is not configurable and the trace for each snapshot is appended when doing cat /debug/tracing/trace. This is a proof of concept that will be extended with future patches to become a (hopefully) useful tool. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace.h')
-rw-r--r--kernel/trace/trace.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 717f9f045c6f..3abd645e8af2 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -27,6 +27,7 @@ enum trace_type {
TRACE_BOOT_RET,
TRACE_FN_RET,
TRACE_USER_STACK,
+ TRACE_BTS,
__TRACE_LAST_TYPE
};
@@ -153,6 +154,12 @@ struct trace_branch {
char correct;
};
+struct bts_entry {
+ struct trace_entry ent;
+ unsigned long from;
+ unsigned long to;
+};
+
/*
* trace_flag_type is an enumeration that holds different
* states when a trace occurs. These are:
@@ -258,6 +265,7 @@ extern void __ftrace_bad_type(void);
IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
IF_ASSIGN(var, ent, struct ftrace_ret_entry, TRACE_FN_RET);\
+ IF_ASSIGN(var, ent, struct bts_entry, TRACE_BTS);\
__ftrace_bad_type(); \
} while (0)
@@ -392,6 +400,10 @@ void trace_function(struct trace_array *tr,
void
trace_function_return(struct ftrace_retfunc *trace);
+void trace_bts(struct trace_array *tr,
+ unsigned long from,
+ unsigned long to);
+
void tracing_start_cmdline_record(void);
void tracing_stop_cmdline_record(void);
void tracing_sched_switch_assign_trace(struct trace_array *tr);