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init/main.c: log initcall level when initcall_debug is used

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When initcall_debug is specified on the command line, the start and return
point for each initcall is printed.  However, no information on the
initcall level is reported.

Add to the initcall_debug infrastructure an additional print that informs
when a new initcall level is entered.  This is particularly useful when
debugging dependency chains and/or working on boot time reduction.

Link: https://lkml.kernel.org/r/20250316205014.2830071-2-francesco@valla.it
Signed-off-by: Francesco Valla <francesco@valla.it>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tim Bird <tim.bird@sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Francesco Valla 2025-03-16 21:50:15 +01:00 committed by Andrew Morton
parent 3ca55ca225
commit 3330dc1b20
1 changed files with 16 additions and 2 deletions
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18
init/main.c
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@ -1214,6 +1214,12 @@ trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime));
}
static __init_or_module void
trace_initcall_level_cb(void *data, const char *level)
{
printk(KERN_DEBUG "entering initcall level: %s\n", level);
}
static ktime_t initcall_calltime;
#ifdef TRACEPOINTS_ENABLED
@ -1225,10 +1231,12 @@ static void __init initcall_debug_enable(void)
&initcall_calltime);
ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
&initcall_calltime);
ret |= register_trace_initcall_level(trace_initcall_level_cb, NULL);
WARN(ret, "Failed to register initcall tracepoints\n");
}
# define do_trace_initcall_start trace_initcall_start
# define do_trace_initcall_finish trace_initcall_finish
# define do_trace_initcall_level trace_initcall_level
#else
static inline void do_trace_initcall_start(initcall_t fn)
{
@ -1242,6 +1250,12 @@ static inline void do_trace_initcall_finish(initcall_t fn, int ret)
return;
trace_initcall_finish_cb(&initcall_calltime, fn, ret);
}
static inline void do_trace_initcall_level(const char *level)
{
if (!initcall_debug)
return;
trace_initcall_level_cb(NULL, level);
}
#endif /* !TRACEPOINTS_ENABLED */
int __init_or_module do_one_initcall(initcall_t fn)
@ -1314,7 +1328,7 @@ static void __init do_initcall_level(int level, char *command_line)
level, level,
NULL, ignore_unknown_bootoption);
trace_initcall_level(initcall_level_names[level]);
do_trace_initcall_level(initcall_level_names[level]);
for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
do_one_initcall(initcall_from_entry(fn));
}
@ -1358,7 +1372,7 @@ static void __init do_pre_smp_initcalls(void)
{
initcall_entry_t *fn;
trace_initcall_level("early");
do_trace_initcall_level("early");
for (fn = __initcall_start; fn < __initcall0_start; fn++)
do_one_initcall(initcall_from_entry(fn));
}