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Message-ID: <20121012134813.GK21164@n2100.arm.linux.org.uk>
Date: Fri, 12 Oct 2012 14:48:14 +0100
From: Russell King - ARM Linux <linux@....linux.org.uk>
To: Lee Jones <lee.jones@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Dan Murphy <dmurphy@...com>, Nishanth Menon <nm@...com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linus.walleij@...ricsson.com,
Jonas Aaberg <jonas.aberg@...ricsson.com>,
Will Deacon <will.deacon@....com>, arnd@...db.de,
Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>
Subject: Re: [PATCH] Boottime: A tool for automatic measurement of
kernel/bootloader boot time
On Fri, Oct 12, 2012 at 02:45:42PM +0100, Lee Jones wrote:
> That's odd. I get:
>
> root@ME:/ cat sys/boottime/bootloader
> 0
>
> root@ME:/ cat sys/boottime/kernel
> 4276
>
> root@ME:/ cat /sys/kernel/debug/boottime/summary
> kernel: 4276 msecs
> total: 4276 msecs
>
> root@ME:/ cat /sys/kernel/debug/boottime/bootgraph
> [ 0.185254] calling splash+0x0/0x0
> [ 2.984335] initcall splash+0x0/0x0 returned 0 after 2799 msecs.
> [ 2.984335] calling autoboot_delay+0x0/0x0
> [ 4.089513] initcall autoboot_delay+0x0/0x0 returned 0 after 1105 msecs.
> [ 4.089513] calling load_kernel+0x0/0x0
> [ 4.239174] initcall load_kernel+0x0/0x0 returned 0 after 149 msecs.
> [ 4.239174] calling boot_kernel+0x0/0x0
> [ 4.276260] initcall boot_kernel+0x0/0x0 returned 0 after 37 msecs.
> [ 4.276260] calling uncompress_ll_init+0x0/0x0
> [ 4.276260] initcall uncompress_ll_init+0x0/0x0 returned 0 after 0 msecs.
> [ 4.276260] Freeing init memory: 0K
Umm, what happened to sysfs not becoming procfs v2? I thought we had
a fairly strict requirement for "one value per file and not nicely
formatted" for sysfs?
> > >Author: Lee Jones <lee.jones@...aro.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@....linux.org.uk>
> > > Cc: Will Deacon <will.deacon@....com>
> > > Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
> > > Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>
> > > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > > Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>
> > > Tested-by: Mian Yousaf KAUKAB <mian.yousaf.kaukab@...ricsson.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@...ricsson.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@...ricsson.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@...ricsson.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();
> > > }
> >
>
> --
> Lee Jones
> Linaro ST-Ericsson Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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