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Commit 8f0c45cd authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
Browse files

enhance initcall_debug, measure latency 



enhance the initcall_debug boot option:

 - measure the time the initcall took to execute and report
   it in units of milliseconds.

 - show the return code of initcalls (useful to see failures and
   to make sure that an initcall hung)

[akpm@linux-foundation.org: fix printk warning]
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b73a7e76

init/main.c

+17 −0
Original line number Diff line number Diff line
@@ -648,6 +648,7 @@ static void __init do_initcalls(void) 
	int count = preempt_count();



	for (call = __initcall_start; call < __initcall_end; call++) {

		ktime_t t0, t1, delta;

		char *msg = NULL;

		char msgbuf[40];

		int result;
@@ -657,10 +658,26 @@ static void __init do_initcalls(void) 
			print_fn_descriptor_symbol(": %s()",

					(unsigned long) *call);

			printk("\n");

			t0 = ktime_get();

		}



		result = (*call)();



		if (initcall_debug) {

			t1 = ktime_get();

			delta = ktime_sub(t1, t0);



			printk("initcall 0x%p", *call);

			print_fn_descriptor_symbol(": %s()",

					(unsigned long) *call);

			printk(" returned %d.\n", result);



			printk("initcall 0x%p ran for %Ld msecs: ",

				*call, (unsigned long long)delta.tv64 >> 20);

			print_fn_descriptor_symbol("%s()\n",

				(unsigned long) *call);

		}



		if (result && result != -ENODEV && initcall_debug) {

			sprintf(msgbuf, "error code %d", result);

			msg = msgbuf;