diff options
Diffstat (limited to 'init/main.c')
| -rw-r--r-- | init/main.c | 84 |
1 files changed, 67 insertions, 17 deletions
diff --git a/init/main.c b/init/main.c index e4a3160991ea..d499f4a80e0b 100644 --- a/init/main.c +++ b/init/main.c @@ -97,6 +97,9 @@ #include <asm/sections.h> #include <asm/cacheflush.h> +#define CREATE_TRACE_POINTS +#include <trace/events/initcall.h> + static int kernel_init(void *); extern void init_IRQ(void); @@ -491,6 +494,17 @@ void __init __weak thread_stack_cache_init(void) void __init __weak mem_encrypt_init(void) { } +bool initcall_debug; +core_param(initcall_debug, initcall_debug, bool, 0644); + +#ifdef TRACEPOINTS_ENABLED +static void __init initcall_debug_enable(void); +#else +static inline void initcall_debug_enable(void) +{ +} +#endif + /* * Set up kernel memory allocators */ @@ -612,6 +626,9 @@ asmlinkage __visible void __init start_kernel(void) /* Trace events are available after this */ trace_init(); + if (initcall_debug) + initcall_debug_enable(); + context_tracking_init(); /* init some links before init_ISA_irqs() */ early_irq_init(); @@ -728,9 +745,6 @@ static void __init do_ctors(void) #endif } -bool initcall_debug; -core_param(initcall_debug, initcall_debug, bool, 0644); - #ifdef CONFIG_KALLSYMS struct blacklist_entry { struct list_head next; @@ -800,37 +814,71 @@ static bool __init_or_module initcall_blacklisted(initcall_t fn) #endif __setup("initcall_blacklist=", initcall_blacklist); -static int __init_or_module do_one_initcall_debug(initcall_t fn) +static __init_or_module void +trace_initcall_start_cb(void *data, initcall_t fn) { - ktime_t calltime, delta, rettime; - unsigned long long duration; - int ret; + ktime_t *calltime = (ktime_t *)data; printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current)); - calltime = ktime_get(); - ret = fn(); + *calltime = ktime_get(); +} + +static __init_or_module void +trace_initcall_finish_cb(void *data, initcall_t fn, int ret) +{ + ktime_t *calltime = (ktime_t *)data; + ktime_t delta, rettime; + unsigned long long duration; + rettime = ktime_get(); - delta = ktime_sub(rettime, calltime); + delta = ktime_sub(rettime, *calltime); duration = (unsigned long long) ktime_to_ns(delta) >> 10; printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n", fn, ret, duration); +} - return ret; +static ktime_t initcall_calltime; + +#ifdef TRACEPOINTS_ENABLED +static void __init initcall_debug_enable(void) +{ + int ret; + + ret = register_trace_initcall_start(trace_initcall_start_cb, + &initcall_calltime); + ret |= register_trace_initcall_finish(trace_initcall_finish_cb, + &initcall_calltime); + WARN(ret, "Failed to register initcall tracepoints\n"); } +# define do_trace_initcall_start trace_initcall_start +# define do_trace_initcall_finish trace_initcall_finish +#else +static inline void do_trace_initcall_start(initcall_t fn) +{ + if (!initcall_debug) + return; + trace_initcall_start_cb(&initcall_calltime, fn); +} +static inline void do_trace_initcall_finish(initcall_t fn, int ret) +{ + if (!initcall_debug) + return; + trace_initcall_finish_cb(&initcall_calltime, fn, ret); +} +#endif /* !TRACEPOINTS_ENABLED */ int __init_or_module do_one_initcall(initcall_t fn) { int count = preempt_count(); - int ret; char msgbuf[64]; + int ret; if (initcall_blacklisted(fn)) return -EPERM; - if (initcall_debug) - ret = do_one_initcall_debug(fn); - else - ret = fn(); + do_trace_initcall_start(fn); + ret = fn(); + do_trace_initcall_finish(fn, ret); msgbuf[0] = 0; @@ -874,7 +922,7 @@ static initcall_t *initcall_levels[] __initdata = { /* Keep these in sync with initcalls in include/linux/init.h */ static char *initcall_level_names[] __initdata = { - "early", + "pure", "core", "postcore", "arch", @@ -895,6 +943,7 @@ static void __init do_initcall_level(int level) level, level, NULL, &repair_env_string); + trace_initcall_level(initcall_level_names[level]); for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) do_one_initcall(*fn); } @@ -929,6 +978,7 @@ static void __init do_pre_smp_initcalls(void) { initcall_t *fn; + trace_initcall_level("early"); for (fn = __initcall_start; fn < __initcall0_start; fn++) do_one_initcall(*fn); } |