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tracing: make tracer_init_tracefs initcall asynchronous 

Move trace_eval_init() to subsys_initcall to make it start
earlier.
And to avoid tracer_init_tracefs being blocked by
trace_event_sem which trace_eval_init() hold [1],
queue tracer_init_tracefs() to eval_map_wq to let
the two works being executed sequentially.

It can speed up the initialization of kernel as result
of making tracer_init_tracefs asynchronous.

On my arm64 platform, it reduce ~20ms of 125ms which total
time do_initcalls spend.

Link: https://lkml.kernel.org/r/20220426122407.17042-3-mark-pk.tsai@mediatek.com

[1]: https://lore.kernel.org/r/68d7b3327052757d0cd6359a6c9015a85b437232.camel@pengutronix.de
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Mark-PK Tsai 2022-04-26 20:24:07 +08:00 committed by Steven Rostedt (Google)
parent ef9188bcc6
commit 6621a70046
1 changed files with 22 additions and 10 deletions
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32
kernel/trace/trace.c
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@ -9615,6 +9615,7 @@ extern struct trace_eval_map *__stop_ftrace_eval_maps[];
static struct workqueue_struct *eval_map_wq __initdata;
static struct work_struct eval_map_work __initdata;
static struct work_struct tracerfs_init_work __initdata;
static void __init eval_map_work_func(struct work_struct *work)
{
@ -9640,6 +9641,8 @@ static int __init trace_eval_init(void)
return 0;
}
subsys_initcall(trace_eval_init);
static int __init trace_eval_sync(void)
{
/* Make sure the eval map updates are finished */
@ -9722,15 +9725,8 @@ static struct notifier_block trace_module_nb = {
};
#endif /* CONFIG_MODULES */
static __init int tracer_init_tracefs(void)
static __init void tracer_init_tracefs_work_func(struct work_struct *work)
{
int ret;
trace_access_lock_init();
ret = tracing_init_dentry();
if (ret)
return 0;
event_trace_init();
@ -9752,8 +9748,6 @@ static __init int tracer_init_tracefs(void)
trace_create_file("saved_tgids", TRACE_MODE_READ, NULL,
NULL, &tracing_saved_tgids_fops);
trace_eval_init();
trace_create_eval_file(NULL);
#ifdef CONFIG_MODULES
@ -9768,6 +9762,24 @@ static __init int tracer_init_tracefs(void)
create_trace_instances(NULL);
update_tracer_options(&global_trace);
}
static __init int tracer_init_tracefs(void)
{
int ret;
trace_access_lock_init();
ret = tracing_init_dentry();
if (ret)
return 0;
if (eval_map_wq) {
INIT_WORK(&tracerfs_init_work, tracer_init_tracefs_work_func);
queue_work(eval_map_wq, &tracerfs_init_work);
} else {
tracer_init_tracefs_work_func(NULL);
}
return 0;
}