From bc52cfb0c0aebaed24dab77b33477a20d4e0a430 Mon Sep 17 00:00:00 2001 From: Jonas Aaberg Date: Wed, 30 Jun 2010 14:00:40 +0200 Subject: Boottime - A tool for automatic measurement of kernel and possible boot loader boot time. The overhead is very low and the results will be found under sysfs/bootime, as well as detailed results in debugfs under boottime/. The bootgraph* files are compatible with scripts/bootgraph.pl. The reason for this patch is to provide data (sysfs/boottime) suitable for automatic testcases as well as help for developers to reduce the boot time (debugfs). Signed-off-by: Jonas Aaberg Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/2760 Change-Id: Id8ea7226b3f1f783448962195193b90699d32fc6 Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/3174 Tested-by: Mian Yousaf KAUKAB Reviewed-by: Srinidhi KASAGAR Signed-off-by: Mian Yousaf Kaukab Signed-off-by: Lee Jones --- init/boottime.c | 467 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 467 insertions(+) create mode 100644 init/boottime.c (limited to 'init/boottime.c') diff --git a/init/boottime.c b/init/boottime.c new file mode 100644 index 00000000000..be73e0ee550 --- /dev/null +++ b/init/boottime.c @@ -0,0 +1,467 @@ +/* + * Copyright (C) ST-Ericsson SA 2009-2010 + * + * Author: Jonas Aaberg for ST-Ericsson + * + * License terms: GNU General Public License (GPL) version 2 + * + * boottime is a tool for collecting start-up timing + * information and can together with boot loader support + * display a total system start-up time. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * BOOTTIME_MAX_NAME_LEN is defined in arch/arm/include/asm/setup.h to 64. + * No crisis if they don't match. + */ +#ifndef BOOTTIME_MAX_NAME_LEN +#define BOOTTIME_MAX_NAME_LEN 64 +#endif + +/* + * We have a few static entries, since it is good to have measure points + * before the system is up and running properly + */ +#define NUM_STATIC_BOOTTIME_ENTRIES 16 + +struct boottime_list { + struct list_head list; + char name[BOOTTIME_MAX_NAME_LEN]; + /* Time in us since power on, possible including boot loader. */ + unsigned long time; + bool cpu_load; + struct cpu_usage_stat cpu_usage[NR_CPUS]; +}; + +enum boottime_filter_type { + BOOTTIME_FILTER_OUT_ZERO, + BOOTTIME_FILTER_OUT_LESS_100, + BOOTTIME_FILTER_NOTHING, +}; + +enum boottime_symbolic_print { + BOOTTIME_SYMBOLIC_PRINT, + BOOTTIME_NORMAL_PRINT, +}; + +enum boottime_cpu_load { + BOOTTIME_CPU_LOAD, + BOOTTIME_NO_CPU_LOAD, +}; + +static LIST_HEAD(boottime_list); +static __initdata DEFINE_SPINLOCK(boottime_list_lock); +static __initdata struct boottime_timer boottime_timer; +static __initdata int num_const_boottime_list; +static struct boottime_list const_boottime_list[NUM_STATIC_BOOTTIME_ENTRIES]; +static unsigned long time_kernel_done; +static unsigned long time_bootloader_done; +static __initdata bool system_up; +static bool boottime_done; + +int __attribute__((weak)) boottime_arch_startup(void) +{ + return 0; +} + +int __attribute__((weak)) boottime_bootloader_idle(void) +{ + return 0; +} + +static void __init boottime_mark_core(char *name, + unsigned long time, + enum boottime_symbolic_print symbolic, + enum boottime_cpu_load cpu_load) +{ + struct boottime_list *b; + unsigned long flags = 0; + int i; + + if (system_up) { + b = kmalloc(sizeof(struct boottime_list), GFP_KERNEL); + if (!b) { + printk(KERN_ERR + "boottime: failed to allocate memory!\n"); + return; + } + + } else { + if (num_const_boottime_list < NUM_STATIC_BOOTTIME_ENTRIES) { + b = &const_boottime_list[num_const_boottime_list]; + num_const_boottime_list++; + } else { + printk(KERN_ERR + "boottime: too many early measure points!\n"); + return; + } + } + + INIT_LIST_HEAD(&b->list); + + if (symbolic == BOOTTIME_SYMBOLIC_PRINT) + snprintf(b->name, BOOTTIME_MAX_NAME_LEN, "%pF", name); + else + strncpy(b->name, name, BOOTTIME_MAX_NAME_LEN); + + b->name[BOOTTIME_MAX_NAME_LEN - 1] = '\0'; + b->time = time; + b->cpu_load = cpu_load; + + if (cpu_load == BOOTTIME_CPU_LOAD && system_up) + for_each_possible_cpu(i) { + b->cpu_usage[i].system = kstat_cpu(i).cpustat.system; + b->cpu_usage[i].idle = kstat_cpu(i).cpustat.idle; + b->cpu_usage[i].iowait = kstat_cpu(i).cpustat.iowait; + b->cpu_usage[i].irq = kstat_cpu(i).cpustat.irq; + /* + * TODO: Make sure that user, nice, softirq, steal + * and guest are not used during boot + */ + } + else + b->cpu_load = BOOTTIME_NO_CPU_LOAD; + + if (system_up) { + spin_lock_irqsave(&boottime_list_lock, flags); + list_add(&b->list, &boottime_list); + spin_unlock_irqrestore(&boottime_list_lock, flags); + } else { + list_add(&b->list, &boottime_list); + } +} + +void __init boottime_mark_wtime(char *name, unsigned long time) +{ + boottime_mark_core(name, time, + BOOTTIME_NORMAL_PRINT, + BOOTTIME_NO_CPU_LOAD); +} + +void __ref boottime_mark_symbolic(void *name) +{ + + if (boottime_done) + return; + + if (boottime_timer.get_time) + boottime_mark_core((char *) name, + boottime_timer.get_time(), + BOOTTIME_SYMBOLIC_PRINT, + BOOTTIME_CPU_LOAD); +} + +void __init boottime_mark(char *name) +{ + if (boottime_timer.get_time) + boottime_mark_core(name, + boottime_timer.get_time(), + BOOTTIME_NORMAL_PRINT, + BOOTTIME_CPU_LOAD); +} + +void __init boottime_activate(struct boottime_timer *bt) +{ + struct boottime_list *b; + int res = 0; + unsigned long flags; + + if (bt == NULL) { + printk(KERN_ERR + "boottime: error: bad configured\n"); + return; + } + + if (bt->get_time == NULL) { + printk(KERN_ERR + "boottime: error: you must provide a get_time() function\n"); + return; + } + memcpy(&boottime_timer, bt, sizeof(struct boottime_timer)); + + if (boottime_timer.init) + res = boottime_timer.init(); + + if (res) { + printk(KERN_ERR "boottime: initialization failed\n"); + return; + } + + if (boottime_arch_startup()) + printk(KERN_ERR + "boottime: arch specfic initialization failed\n"); + + spin_lock_irqsave(&boottime_list_lock, flags); + + if (!list_empty(&boottime_list)) { + + b = list_first_entry(&boottime_list, struct boottime_list, + list); + if (b) + time_bootloader_done = b->time; + } + + spin_unlock_irqrestore(&boottime_list_lock, flags); +} + +void __init boottime_system_up(void) +{ + system_up = true; +} + +void __init boottime_deactivate(void) +{ + struct boottime_list *b; + unsigned long flags; + + boottime_mark("execute_init+0x0/0x0"); + + boottime_done = true; + + spin_lock_irqsave(&boottime_list_lock, flags); + b = list_first_entry(&boottime_list, struct boottime_list, list); + spin_unlock_irqrestore(&boottime_list_lock, flags); + + time_kernel_done = b->time; + + if (boottime_timer.finalize) + boottime_timer.finalize(); +} + +#ifdef CONFIG_DEBUG_FS +static void boottime_debugfs_load(struct seq_file *s, + struct boottime_list *b, + struct boottime_list *p) +{ + int i; + unsigned long total_p, total_b; + unsigned long system_total, idle_total, irq_total, iowait_total; + unsigned long system_load, idle_load, irq_load, iowait_load; + + for_each_possible_cpu(i) { + total_b = (b->cpu_usage[i].system + + b->cpu_usage[i].idle + + b->cpu_usage[i].iowait + + b->cpu_usage[i].irq); + + total_p = (p->cpu_usage[i].system + + p->cpu_usage[i].idle + + p->cpu_usage[i].iowait + + p->cpu_usage[i].irq); + + if (total_b == total_p) + continue; + + system_total = b->cpu_usage[i].system - p->cpu_usage[i].system; + idle_total = b->cpu_usage[i].idle - p->cpu_usage[i].idle; + irq_total = b->cpu_usage[i].irq - p->cpu_usage[i].irq; + iowait_total = b->cpu_usage[i].iowait - p->cpu_usage[i].iowait; + + system_load = (100 * system_total / (total_b - total_p)); + idle_load = (100 * idle_total / (total_b - total_p)); + irq_load = (100 * irq_total / (total_b - total_p)); + iowait_load = (100 * iowait_total / (total_b - total_p)); + + seq_printf(s, + " cpu%d system: %lu%% idle: %lu%% iowait: %lu%% irq: %lu%%", + i, + system_load, + idle_load, + iowait_load, + irq_load); + } + seq_printf(s, "\n"); +} + +static void boottime_debugfs_print(struct seq_file *s, + struct boottime_list *b, + struct boottime_list *p) +{ + seq_printf(s, "[%5lu.%06lu] calling %s\n", + p->time / 1000000, + (p->time % 1000000), + p->name); + seq_printf(s, "[%5lu.%06lu] initcall %s returned 0 after %ld msecs.", + b->time / 1000000, + (b->time % 1000000), + p->name, (b->time - p->time) / 1000); + + if (p->cpu_load == BOOTTIME_NO_CPU_LOAD || + b->cpu_load == BOOTTIME_NO_CPU_LOAD) { + seq_printf(s, "\n"); + return; + } + + boottime_debugfs_load(s, b, p); +} + +static int boottime_debugfs_bootgraph_show(struct seq_file *s, void *iter) +{ + struct boottime_list *b, *p = NULL, *old_p = NULL; + enum boottime_filter_type filter = (int)s->private; + + list_for_each_entry_reverse(b, &boottime_list, list) { + if (p) { + if (!(filter == BOOTTIME_FILTER_OUT_ZERO && + (b->time - p->time) / 1000 == 0) + && !(filter == BOOTTIME_FILTER_OUT_LESS_100 && + (b->time - p->time) < 100 * 1000)) + boottime_debugfs_print(s, b, p); + old_p = p; + } + p = b; + } + + if (filter == BOOTTIME_FILTER_NOTHING && p) + boottime_debugfs_print(s, p, p); + + if (p) + seq_printf(s, "[%5lu.%06lu] Freeing init memory: 0K\n", + p->time / 1000000, p->time % 1000000); + return 0; +} + +static int boottime_debugfs_summary_show(struct seq_file *s, void *data) +{ + struct boottime_list *b, b_zero; + + if (time_bootloader_done) + seq_printf(s, "bootloader: %ld msecs\n", + time_bootloader_done / 1000); + + seq_printf(s, "kernel: %ld msecs\ntotal: %ld msecs\n", + (time_kernel_done - time_bootloader_done) / 1000, + time_kernel_done / 1000); + seq_printf(s, "kernel:"); + b = list_first_entry(&boottime_list, + struct boottime_list, list); + memset(&b_zero, 0, sizeof(struct boottime_list)); + boottime_debugfs_load(s, b, &b_zero); + + if (time_bootloader_done) + seq_printf(s, + "bootloader: cpu0 system: %d%% idle: %d%% iowait: 0%% irq: 0%%\n", + 100 - boottime_bootloader_idle(), + boottime_bootloader_idle()); + return 0; +} + +static int boottime_debugfs_bootgraph_open(struct inode *inode, + struct file *file) +{ + return single_open(file, + boottime_debugfs_bootgraph_show, + inode->i_private); +} + +static int boottime_debugfs_summary_open(struct inode *inode, + struct file *file) +{ + return single_open(file, + boottime_debugfs_summary_show, + inode->i_private); +} + +static const struct file_operations boottime_debugfs_bootgraph_operations = { + .open = boottime_debugfs_bootgraph_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static const struct file_operations boottime_debugfs_summary_operations = { + .open = boottime_debugfs_summary_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +void boottime_debugfs_init(void) +{ + struct dentry *dir; + + dir = debugfs_create_dir("boottime", NULL); + + (void) debugfs_create_file("bootgraph", S_IFREG | S_IRUGO, + dir, (void *)BOOTTIME_FILTER_NOTHING, + &boottime_debugfs_bootgraph_operations); + (void) debugfs_create_file("bootgraph_all_except0", S_IFREG | S_IRUGO, + dir, (void *)BOOTTIME_FILTER_OUT_ZERO, + &boottime_debugfs_bootgraph_operations); + (void) debugfs_create_file("bootgraph_larger100", + S_IFREG | S_IRUGO, + dir, (void *)BOOTTIME_FILTER_OUT_LESS_100, + &boottime_debugfs_bootgraph_operations); + (void) debugfs_create_file("summary", S_IFREG | S_IRUGO, + dir, NULL, + &boottime_debugfs_summary_operations); +} +#else +#define boottime_debugfs_init(x) +#endif + +static ssize_t show_bootloader(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%ld\n", time_bootloader_done / 1000); +} + +static ssize_t show_kernel(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%ld\n", + (time_kernel_done - time_bootloader_done) / 1000); +} + +DEVICE_ATTR(kernel, 0444, show_kernel, NULL); +DEVICE_ATTR(bootloader, 0444, show_bootloader, NULL); + +static struct attribute *boottime_sysfs_entries[] = { + &dev_attr_kernel.attr, + &dev_attr_bootloader.attr, + NULL +}; + +static struct attribute_group boottime_attr_grp = { + .name = NULL, + .attrs = boottime_sysfs_entries, +}; + +static int __init boottime_init(void) +{ + struct kobject *boottime_kobj; + + boottime_kobj = kobject_create_and_add("boottime", NULL); + if (!boottime_kobj) { + printk(KERN_ERR "boottime: out of memory!\n"); + return -ENOMEM; + } + + if (sysfs_create_group(boottime_kobj, &boottime_attr_grp) < 0) { + kobject_put(boottime_kobj); + printk(KERN_ERR "boottime: Failed creating sysfs group\n"); + return -ENOMEM; + } + + boottime_debugfs_init(); + + return 0; +} + +late_initcall(boottime_init); -- cgit v1.2.3