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enhance initcall_debug, measure latency

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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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ingo Molnar 2007-05-08 00:28:26 -07:00 committed by Linus Torvalds
parent b73a7e76c1
commit 8f0c45cdf8
1 changed files with 17 additions and 0 deletions
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17
init/main.c
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@ -648,6 +648,7 @@ static void __init do_initcalls(void)
int count = preempt_count(); int count = preempt_count();
for (call = __initcall_start; call < __initcall_end; call++) { for (call = __initcall_start; call < __initcall_end; call++) {
ktime_t t0, t1, delta;
char *msg = NULL; char *msg = NULL;
char msgbuf[40]; char msgbuf[40];
int result; int result;
@ -657,10 +658,26 @@ static void __init do_initcalls(void)
print_fn_descriptor_symbol(": %s()", print_fn_descriptor_symbol(": %s()",
(unsigned long) *call); (unsigned long) *call);
printk("\n"); printk("\n");
t0 = ktime_get();
} }
result = (*call)(); 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) { if (result && result != -ENODEV && initcall_debug) {
sprintf(msgbuf, "error code %d", result); sprintf(msgbuf, "error code %d", result);
msg = msgbuf; msg = msgbuf;