diff options
| author | Masami Hiramatsu <mhiramat@kernel.org> | 2021-06-02 16:33:00 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-06-10 17:16:20 +0200 |
| commit | 4f99f8489950c03c792f17ca2d55cbb591286174 (patch) | |
| tree | 92ee31c95c585beeb8dd3fb306b005c13b99ade8 /kernel/trace/trace_boot.c | |
| parent | tracing: Add WARN_ON_ONCE when returned value is negative (diff) | |
| download | linux-4f99f8489950c03c792f17ca2d55cbb591286174.tar.xz linux-4f99f8489950c03c792f17ca2d55cbb591286174.zip | |
tracing/boot: Add per-group/all events enablement
Add ftrace.event.<GROUP>.enable and ftrace.event.enable
boot-time tracing, which enables all events under
given GROUP and all events respectivly.
Link: https://lkml.kernel.org/r/162264438005.302580.12019174481201855444.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_boot.c')
| -rw-r--r-- | kernel/trace/trace_boot.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c index a82f03f385f8..94ef2d099e32 100644 --- a/kernel/trace/trace_boot.c +++ b/kernel/trace/trace_boot.c @@ -225,14 +225,37 @@ static void __init trace_boot_init_events(struct trace_array *tr, struct xbc_node *node) { struct xbc_node *gnode, *enode; + bool enable, enable_all = false; + const char *data; node = xbc_node_find_child(node, "event"); if (!node) return; /* per-event key starts with "event.GROUP.EVENT" */ - xbc_node_for_each_child(node, gnode) - xbc_node_for_each_child(gnode, enode) + xbc_node_for_each_child(node, gnode) { + data = xbc_node_get_data(gnode); + if (!strcmp(data, "enable")) { + enable_all = true; + continue; + } + enable = false; + xbc_node_for_each_child(gnode, enode) { + data = xbc_node_get_data(enode); + if (!strcmp(data, "enable")) { + enable = true; + continue; + } trace_boot_init_one_event(tr, gnode, enode); + } + /* Event enablement must be done after event settings */ + if (enable) { + data = xbc_node_get_data(gnode); + trace_array_set_clr_event(tr, data, NULL, true); + } + } + /* Ditto */ + if (enable_all) + trace_array_set_clr_event(tr, NULL, NULL, true); } #else #define trace_boot_enable_events(tr, node) do {} while (0) |