[PATCH] Boottime: A tool for automatic measurement of kernel/bootloader boot time
Dan Murphy
dmurphy at ti.com
Fri Oct 12 09:35:36 EDT 2012
On a note on testing.
OK this at least compiles on my system with 3.4.
The weird thing is that I get the same exact kernel boot time for two
different machines.
When I cat the summary for the kernel.
I am not profiling the bootloader time here as it is neglible so no ATAG
argument.
kernel: 3221288 msecs
total: 3221288 msecs
kernel: cpu0 system: 0% idle: 0% iowait: 0% irq: 0% cpu1 system: 0%
idle: 0% iowait: 0% irq: 0%
And I get no output from any of the bootgraph entries.
Dan
On 10/12/2012 04:51 AM, Lee Jones wrote:
> Okay, please disgard the last patch. Lots of fixups since.
>
> Author: Lee Jones <lee.jones at linaro.org>
> Date: Wed Jun 30 14:00:40 2010 +0200
>
> Boottime: A tool for automatic measurement of kernel/bootloader 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 test-cases as
> well as help for developers to reduce the boot time (debugfs).
>
> Based heavily on the original driver by Jonas Aaberg.
>
> Cc: Russell King <linux at arm.linux.org.uk>
> Cc: Will Deacon <will.deacon at arm.com>
> Signed-off-by: Jonas Aaberg <jonas.aberg at stericsson.com>
> Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab at stericsson.com>
> Signed-off-by: Lee Jones <lee.jones at linaro.org>
> Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar at stericsson.com>
> Tested-by: Mian Yousaf KAUKAB <mian.yousaf.kaukab at stericsson.com>
>
> diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
> index e8a4e58..8522356 100644
> --- a/arch/arm/common/Makefile
> +++ b/arch/arm/common/Makefile
> @@ -13,3 +13,4 @@ obj-$(CONFIG_SHARP_PARAM) += sharpsl_param.o
> obj-$(CONFIG_SHARP_SCOOP) += scoop.o
> obj-$(CONFIG_PCI_HOST_ITE8152) += it8152.o
> obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o
> +obj-$(CONFIG_BOOTTIME) += boottime.o
> diff --git a/arch/arm/common/boottime.c b/arch/arm/common/boottime.c
> new file mode 100644
> index 0000000..73e9e04
> --- /dev/null
> +++ b/arch/arm/common/boottime.c
> @@ -0,0 +1,46 @@
> +/*
> + * Copyright (C) ST-Ericsson SA 2009-2010
> + *
> + * Author: Jonas Aaberg <jonas.aberg at stericsson.com> for ST-Ericsson
> + *
> + * License terms: GNU General Public License (GPL) version 2
> + *
> + * Store boot times measured during for example u-boot startup.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/boottime.h>
> +#include <linux/string.h>
> +#include <asm/setup.h>
> +
> +static u32 bootloader_idle;
> +static u32 bootloader_total;
> +
> +static int __init boottime_parse_tag(const struct tag *tag)
> +{
> + int i;
> + char buff[BOOTTIME_MAX_NAME_LEN];
> +
> + bootloader_idle = tag->u.boottime.idle;
> + bootloader_total = tag->u.boottime.total;
> +
> + for (i = 0; i < tag->u.boottime.num; i++) {
> + snprintf(buff, BOOTTIME_MAX_NAME_LEN, "%s+0x0/0x0",
> + tag->u.boottime.entry[i].name);
> + buff[BOOTTIME_MAX_NAME_LEN - 1] = '\0';
> + boottime_mark_wtime(buff, tag->u.boottime.entry[i].time);
> + }
> +
> + return 0;
> +}
> +
> +__tagtable(ATAG_BOOTTIME, boottime_parse_tag);
> +
> +int boottime_bootloader_idle(void)
> +{
> + if (bootloader_total == 0)
> + return 0;
> +
> + return (int) ((bootloader_idle) / (bootloader_total / 100));
> +}
> diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h
> index 24d284a..e8da062 100644
> --- a/arch/arm/include/asm/setup.h
> +++ b/arch/arm/include/asm/setup.h
> @@ -143,6 +143,23 @@ struct tag_memclk {
> __u32 fmemclk;
> };
>
> +/* for automatic boot timing testcases */
> +#define ATAG_BOOTTIME 0x41000403
> +#define BOOTTIME_MAX_NAME_LEN 64
> +#define BOOTTIME_MAX 10
> +
> +struct boottime_entry {
> + u32 time; /* in us */
> + u8 name[BOOTTIME_MAX_NAME_LEN];
> +};
> +
> +struct tag_boottime {
> + struct boottime_entry entry[BOOTTIME_MAX];
> + u32 idle; /* in us */
> + u32 total; /* in us */
> + u8 num;
> +};
> +
> struct tag {
> struct tag_header hdr;
> union {
> @@ -165,6 +182,10 @@ struct tag {
> * DC21285 specific
> */
> struct tag_memclk memclk;
> + /*
> + * Boot time
> + */
> + struct tag_boottime boottime;
> } u;
> };
>
> diff --git a/include/linux/boottime.h b/include/linux/boottime.h
> new file mode 100644
> index 0000000..d330ecd
> --- /dev/null
> +++ b/include/linux/boottime.h
> @@ -0,0 +1,89 @@
> +/*
> + * Copyright (C) ST-Ericsson SA 2009-2010
> + *
> + * Author: Jonas Aaberg <jonas.aberg at stericsson.com> 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.
> + *
> + */
> +
> +#ifndef LINUX_BOOTTIME_H
> +#define LINUX_BOOTTIME_H
> +
> +#ifdef CONFIG_BOOTTIME
> +#include <linux/kernel.h>
> +
> +/**
> + * struct boottime_timer - Callbacks for generic timer.
> + * @init: Function to call at boottime initialization
> + * @get_time: Returns the number of us since start-up
> + * Preferable this is based upon a free running timer.
> + * This is the only required entry.
> + * @finalize: Called before init is executed and boottime is done.
> + */
> +struct boottime_timer {
> + int (*init)(void);
> + unsigned long (*get_time)(void);
> + void (*finalize)(void);
> +};
> +
> +/**
> + * boottime_mark_wtime()
> + * Add a sample point with a given time. Useful for adding data collected
> + * by for example a boot loader.
> + * @name: The name of the sample point
> + * @time: The time in us when this point was reached
> + */
> +void __init boottime_mark_wtime(char *name, unsigned long time);
> +
> +/**
> + * boottime_mark()
> + * Add a sample point with the current time.
> + * @name: The name of this sample point
> + */
> +void boottime_mark(char *name);
> +
> +/**
> + * boottime_mark_symbolic()
> + * Add a sample point where the name is a symbolic function
> + * and %pF is needed to get the correct function name.
> + * @name: function name.
> + */
> +void __init boottime_mark_symbolic(void *name);
> +
> +/**
> + * boottime_activate()
> + * Activates boottime and register callbacks.
> + * @bt: struct with callbacks.
> + */
> +void __ref boottime_activate(struct boottime_timer *bt);
> +
> +/**
> + * boottime_deactivate()
> + * This function is called when the kernel boot is done.
> + * (before "free init memory" is called)
> + */
> +void boottime_deactivate(void);
> +
> +/**
> + * boottime_system_up()
> + * A function is called when the basics of the kernel
> + * is up and running.
> + */
> +void __init boottime_system_up(void);
> +
> +#else
> +
> +#define boottime_mark_wtime(name, time)
> +#define boottime_mark(name)
> +#define boottime_mark_symbolic(name)
> +#define boottime_activate(bt)
> +#define boottime_deactivate()
> +#define boottime_system_up()
> +#endif
> +
> +#endif /* LINUX_BOOTTIME_H */
> diff --git a/init/Kconfig b/init/Kconfig
> index 4c93533..d0df8ff 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1464,6 +1464,15 @@ config PROFILING
> Say Y here to enable the extended profiling support mechanisms used
> by profilers such as OProfile.
>
> +config BOOTTIME
> + bool "Boot time measurements"
> + default n
> + help
> + Adds sysfs entries (boottime/) with start-up timing information.
> + If CONFIG_DEBUG_FS is enabled, detailed information about the
> + boot time, including system load during boot can be extracted.
> + This information can be visualised with help of the bootgraph script.
> +
> #
> # Place an empty function call at each tracepoint site. Can be
> # dynamically changed for a probe function.
> diff --git a/init/Makefile b/init/Makefile
> index 7bc47ee..356d529 100644
> --- a/init/Makefile
> +++ b/init/Makefile
> @@ -9,6 +9,7 @@ else
> obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o
> endif
> obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
> +obj-$(CONFIG_BOOTTIME) += boottime.o
>
> ifneq ($(CONFIG_ARCH_INIT_TASK),y)
> obj-y += init_task.o
> diff --git a/init/boottime.c b/init/boottime.c
> new file mode 100644
> index 0000000..793c184
> --- /dev/null
> +++ b/init/boottime.c
> @@ -0,0 +1,475 @@
> +/*
> + * Copyright (C) ST-Ericsson SA 2009-2010
> + *
> + * Author: Jonas Aaberg <jonas.aberg at stericsson.com> 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 <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/list.h>
> +#include <linux/seq_file.h>
> +#include <linux/debugfs.h>
> +#include <linux/spinlock.h>
> +#include <linux/boottime.h>
> +#include <linux/kernel_stat.h>
> +#include <linux/kobject.h>
> +#include <linux/device.h>
> +#include <linux/sysfs.h>
> +#include <linux/slab.h>
> +
> +/*
> + * 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 32
> +
> +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 kernel_cpustat 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 DEFINE_SPINLOCK(boottime_list_lock);
> +static struct boottime_timer boottime_timer;
> +static 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 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 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].cpustat[CPUTIME_SYSTEM] =
> + kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
> + b->cpu_usage[i].cpustat[CPUTIME_IDLE] =
> + kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
> + b->cpu_usage[i].cpustat[CPUTIME_IOWAIT] =
> + kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT];
> + b->cpu_usage[i].cpustat[CPUTIME_IRQ] =
> + kcpustat_cpu(i).cpustat[CPUTIME_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 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 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].cpustat[CPUTIME_SYSTEM] +
> + b->cpu_usage[i].cpustat[CPUTIME_IDLE] +
> + b->cpu_usage[i].cpustat[CPUTIME_IOWAIT] +
> + b->cpu_usage[i].cpustat[CPUTIME_IRQ]);
> +
> + total_p = (p->cpu_usage[i].cpustat[CPUTIME_SYSTEM] +
> + p->cpu_usage[i].cpustat[CPUTIME_IDLE] +
> + p->cpu_usage[i].cpustat[CPUTIME_IOWAIT] +
> + p->cpu_usage[i].cpustat[CPUTIME_IRQ]);
> +
> + if (total_b == total_p)
> + continue;
> +
> + system_total = b->cpu_usage[i].cpustat[CPUTIME_SYSTEM]
> + - p->cpu_usage[i].cpustat[CPUTIME_SYSTEM];
> + idle_total = b->cpu_usage[i].cpustat[CPUTIME_IDLE]
> + - p->cpu_usage[i].cpustat[CPUTIME_IDLE];
> + irq_total = b->cpu_usage[i].cpustat[CPUTIME_IRQ]
> + - p->cpu_usage[i].cpustat[CPUTIME_IRQ];
> + iowait_total = b->cpu_usage[i].cpustat[CPUTIME_IOWAIT]
> + - p->cpu_usage[i].cpustat[CPUTIME_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);
> diff --git a/init/main.c b/init/main.c
> index 313360f..c06afd0 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -69,6 +69,7 @@
> #include <linux/slab.h>
> #include <linux/perf_event.h>
> #include <linux/file.h>
> +#include <linux/boottime.h>
>
> #include <asm/io.h>
> #include <asm/bugs.h>
> @@ -679,6 +680,8 @@ int __init_or_module do_one_initcall(initcall_t fn)
> int count = preempt_count();
> int ret;
>
> + boottime_mark_symbolic(fn);
> +
> if (initcall_debug)
> ret = do_one_initcall_debug(fn);
> else
> @@ -804,6 +807,7 @@ static noinline int init_post(void)
> {
> /* need to finish all async __init code before freeing the memory */
> async_synchronize_full();
> + boottime_deactivate();
> free_initmem();
> mark_rodata_ro();
> system_state = SYSTEM_RUNNING;
> @@ -863,6 +867,7 @@ static int __init kernel_init(void * unused)
>
> do_pre_smp_initcalls();
> lockup_detector_init();
> + boottime_system_up();
>
> smp_init();
> sched_init_smp();
> @@ -885,6 +890,7 @@ static int __init kernel_init(void * unused)
>
> if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
> ramdisk_execute_command = NULL;
> + boottime_mark("mount+0x0/0x0");
> prepare_namespace();
> }
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