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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2020-09-10 10:55:15 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-09-22 03:06:03 +0200 |
| commit | 8490db06f914100fc8a5110481cbd37d8968be90 (patch) | |
| tree | 17b51deaf2ff38ba43ff1034022afa18848bfdb2 /kernel/trace/trace_boot.c | |
| parent | fgraph: Convert ret_stack tasklist scanning to rcu (diff) | |
| download | linux-8490db06f914100fc8a5110481cbd37d8968be90.tar.xz linux-8490db06f914100fc8a5110481cbd37d8968be90.zip | |
tracing/boot: Add per-instance tracing_on option support
Add per-instance tracing_on option, which will be useful with
traceon/traceoff event trigger actions. For example, if we
disable tracing_on by default and set traceon and traceoff on
a pair of events, we can trace functions between the pair of
events.
Link: https://lkml.kernel.org/r/159972811538.428528.2561315102284268611.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 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c index fa0fc08c6ef8..d52d441a17e8 100644 --- a/kernel/trace/trace_boot.c +++ b/kernel/trace/trace_boot.c @@ -40,6 +40,16 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node) pr_err("Failed to set option: %s\n", buf); } + p = xbc_node_find_value(node, "tracing_on", NULL); + if (p && *p != '\0') { + if (kstrtoul(p, 10, &v)) + pr_err("Failed to set tracing on: %s\n", p); + if (v) + tracer_tracing_on(tr); + else + tracer_tracing_off(tr); + } + p = xbc_node_find_value(node, "trace_clock", NULL); if (p && *p != '\0') { if (tracing_set_clock(tr, p) < 0) |