Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756835Ab2KOKEv (ORCPT ); Thu, 15 Nov 2012 05:04:51 -0500 Received: from mail-wi0-f170.google.com ([209.85.212.170]:38446 "EHLO mail-wi0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756778Ab2KOKEX (ORCPT ); Thu, 15 Nov 2012 05:04:23 -0500 From: Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: arnd@arndb.de, linus.walleij@stericsson.com, jonas.aberg@stericsson.com, linux@arm.linux.org.uk, will.deacon@arm.com, Lee Jones , Mian Yousaf Kaukab Subject: [PATCH 1/2] Boottime: A tool for automatic measurement of kernel/bootloader boot time Date: Thu, 15 Nov 2012 10:04:06 +0000 Message-Id: <1352973847-21605-2-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1352973847-21605-1-git-send-email-lee.jones@linaro.org> References: <1352973847-21605-1-git-send-email-lee.jones@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 21664 Lines: 792 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 Cc: Will Deacon Signed-off-by: Jonas Aaberg Signed-off-by: Mian Yousaf Kaukab Signed-off-by: Lee Jones Reviewed-by: Srinidhi KASAGAR Tested-by: Mian Yousaf KAUKAB --- arch/arm/common/Makefile | 1 + arch/arm/common/boottime.c | 46 ++++ arch/arm/include/uapi/asm/setup.h | 22 ++ include/linux/boottime.h | 89 +++++++ init/Kconfig | 9 + init/Makefile | 1 + init/boottime.c | 475 +++++++++++++++++++++++++++++++++++++ init/main.c | 6 + 8 files changed, 649 insertions(+) create mode 100644 arch/arm/common/boottime.c create mode 100644 include/linux/boottime.h create mode 100644 init/boottime.c 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 for ST-Ericsson + * + * License terms: GNU General Public License (GPL) version 2 + * + * Store boot times measured during for example u-boot startup. + */ + +#include +#include +#include +#include +#include + +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/uapi/asm/setup.h b/arch/arm/include/uapi/asm/setup.h index 979ff40..5bc9026 100644 --- a/arch/arm/include/uapi/asm/setup.h +++ b/arch/arm/include/uapi/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 +182,11 @@ 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 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 + +/** + * 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 6fdd6e3..85a34aa 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1476,6 +1476,15 @@ 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..cef31f6 --- /dev/null +++ b/init/boottime.c @@ -0,0 +1,475 @@ +/* + * 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 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: badly 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 9cf77ab..d404632 100644 --- a/init/main.c +++ b/init/main.c @@ -70,6 +70,7 @@ #include #include #include +#include #include #include @@ -680,6 +681,8 @@ 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 @@ -805,6 +808,7 @@ static int __ref kernel_init(void *unused) kernel_init_freeable(); /* 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; @@ -867,6 +871,7 @@ static void __init kernel_init_freeable(void) do_pre_smp_initcalls(); lockup_detector_init(); + boottime_system_up(); smp_init(); sched_init_smp(); @@ -889,6 +894,7 @@ static void __init kernel_init_freeable(void) if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { ramdisk_execute_command = NULL; + boottime_mark("mount+0x0/0x0"); prepare_namespace(); } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/