unimore/kernel-hacking-2024-linux-steffo
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tracing/boot, kprobe, synth: Initialize boot-time tracing earlier

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Initialize boot-time tracing in core_initcall_sync instead of
fs_initcall, and initialize required tracers (kprobes and synth)
in core_initcall. This will allow the boot-time tracing to trace
__init code from the beginning of postcore_initcall stage.

Link: https://lkml.kernel.org/r/159974155727.478751.7486926132902849578.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-09-10 21:39:17 +09:00 committed by Steven Rostedt (VMware)
parent 4114fbfd02
commit ba0fbfbb21
3 changed files with 24 additions and 12 deletions
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7
kernel/trace/trace_boot.c
View file

@ -340,5 +340,8 @@ static int __init trace_boot_init(void)
return 0;
}
fs_initcall(trace_boot_init);
/*
* Start tracing at the end of core-initcall, so that it starts tracing
* from the beginning of postcore_initcall.
*/
core_initcall_sync(trace_boot_init);

23
kernel/trace/trace_events_synth.c
View file

@ -1754,17 +1754,26 @@ static const struct file_operations synth_events_fops = {
.release = seq_release,
};
/*
* Register dynevent at core_initcall. This allows kernel to setup kprobe
* events in postcore_initcall without tracefs.
*/
static __init int trace_events_synth_init_early(void)
{
int err = 0;
err = dyn_event_register(&synth_event_ops);
if (err)
pr_warn("Could not register synth_event_ops\n");
return err;
}
core_initcall(trace_events_synth_init_early);
static __init int trace_events_synth_init(void)
{
struct dentry *entry = NULL;
int err = 0;
err = dyn_event_register(&synth_event_ops);
if (err) {
pr_warn("Could not register synth_event_ops\n");
return err;
}
err = tracing_init_dentry();
if (err)
goto err;

6
kernel/trace/trace_kprobe.c
View file

@ -1897,8 +1897,8 @@ static __init void setup_boot_kprobe_events(void)
}
/*
* Register dynevent at subsys_initcall. This allows kernel to setup kprobe
* events in fs_initcall without tracefs.
* Register dynevent at core_initcall. This allows kernel to setup kprobe
* events in postcore_initcall without tracefs.
*/
static __init int init_kprobe_trace_early(void)
{
@ -1913,7 +1913,7 @@ static __init int init_kprobe_trace_early(void)
return 0;
}
subsys_initcall(init_kprobe_trace_early);
core_initcall(init_kprobe_trace_early);
/* Make a tracefs interface for controlling probe points */
static __init int init_kprobe_trace(void)