diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 7 | ||||
| -rw-r--r-- | init/main.c | 34 |
2 files changed, 27 insertions, 14 deletions
diff --git a/init/Kconfig b/init/Kconfig index 8828ed0b205..c6b70313bf0 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -786,6 +786,13 @@ config PROFILING Say Y here to enable the extended profiling support mechanisms used by profilers such as OProfile. +# +# Place an empty function call at each tracepoint site. Can be +# dynamically changed for a probe function. +# +config TRACEPOINTS + bool + config MARKERS bool "Activate markers" help diff --git a/init/main.c b/init/main.c index 4371d11721f..3e17a3bafe6 100644 --- a/init/main.c +++ b/init/main.c @@ -61,6 +61,7 @@ #include <linux/sched.h> #include <linux/signal.h> #include <linux/idr.h> +#include <linux/ftrace.h> #include <asm/io.h> #include <asm/bugs.h> @@ -689,6 +690,8 @@ asmlinkage void __init start_kernel(void) acpi_early_init(); /* before LAPIC and SMP init */ + ftrace_init(); + /* Do the rest non-__init'ed, we're now alive */ rest_init(); } @@ -705,30 +708,31 @@ __setup("initcall_debug", initcall_debug_setup); int do_one_initcall(initcall_t fn) { int count = preempt_count(); - ktime_t t0, t1, delta; + ktime_t delta; char msgbuf[64]; - int result; + struct boot_trace it; if (initcall_debug) { - printk("calling %pF @ %i\n", fn, task_pid_nr(current)); - t0 = ktime_get(); + it.caller = task_pid_nr(current); + printk("calling %pF @ %i\n", fn, it.caller); + it.calltime = ktime_get(); } - result = fn(); + it.result = fn(); if (initcall_debug) { - t1 = ktime_get(); - delta = ktime_sub(t1, t0); - - printk("initcall %pF returned %d after %Ld msecs\n", - fn, result, - (unsigned long long) delta.tv64 >> 20); + it.rettime = ktime_get(); + delta = ktime_sub(it.rettime, it.calltime); + it.duration = (unsigned long long) delta.tv64 >> 10; + printk("initcall %pF returned %d after %Ld usecs\n", fn, + it.result, it.duration); + trace_boot(&it, fn); } msgbuf[0] = 0; - if (result && result != -ENODEV && initcall_debug) - sprintf(msgbuf, "error code %d ", result); + if (it.result && it.result != -ENODEV && initcall_debug) + sprintf(msgbuf, "error code %d ", it.result); if (preempt_count() != count) { strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf)); @@ -742,7 +746,7 @@ int do_one_initcall(initcall_t fn) printk("initcall %pF returned with %s\n", fn, msgbuf); } - return result; + return it.result; } @@ -857,6 +861,7 @@ static int __init kernel_init(void * unused) smp_prepare_cpus(setup_max_cpus); do_pre_smp_initcalls(); + start_boot_trace(); smp_init(); sched_init_smp(); @@ -883,6 +888,7 @@ static int __init kernel_init(void * unused) * we're essentially up and running. Get rid of the * initmem segments and start the user-mode stuff.. */ + stop_boot_trace(); init_post(); return 0; } |