diff options
| author | Markus Metzger <markus.t.metzger@intel.com> | 2008-11-25 09:24:15 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-25 17:31:13 +0100 |
| commit | 1e9b51c28312f7334394aa30be56ff52c2b65b7e (patch) | |
| tree | c0a231d83541263ee938e3452475409323e4e9a9 /kernel/trace/trace.h | |
| parent | 8bba1bf5e2434c83f2fe8b1422604ace9bbe4cb8 (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.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 717f9f045c6..3abd645e8af 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); |