如何启用Android L MR1 5.1的引导图表

我正在调查android的首次启动，并希望启用bootchart，但我总是失败，下面是我所做的，有人可以帮助我吗

因为bootchart服务在/data分区装载之前启动，所以每次bootchart初始化失败。 内核日志中的失败消息是：bootcheringinitfailure

因此，为了确保bootchart init成功，我修改了相关代码。这个解决方案在AndroidL中可以很好地工作，但在AndroidL MR1中失败了。 手机在执行以下更改后保持重启；在我禁用selinux后，手机会在第一个徽标处阻塞

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有人在android L MR1上启用过引导图吗？如何更改的代码？ 如何修改代码以确保bootchart init在/data/partition挂载后运行

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提前谢谢你！这对我来说是非常严重的。

通过这个

init.rc

，我能够为第一次启动启用引导图表：

on post-fs-data
    # We chown/chmod /data again so because mount is run as root + defaults
    chown system system /data
    chmod 0771 /data
    # We restorecon /data in case the userdata partition has been reset.
    restorecon /data

    # start debuggerd to make debugging early-boot crashes easier.
    start debuggerd
    start debuggerd64

    # Make sure we have the device encryption key.
    start vold
    installkey /data

    # Start bootcharting as soon as possible after the data partition is
    # mounted to collect more data.
    mkdir /data/bootchart 0755 shell shell
    # if you need to enable bootchart uncomment next line
    # Old Android
    # write /data/bootchart-start 120 
    # Android > 7.0
    # write /data/bootchart/start 120 
    bootchart_init

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有人能回答我的问题吗？你没有试过在Android 5.1上启用bootchart吗？你找到解决方案了吗？

init/init.c
static int bootchart_init_action(int nargs, char **args)
{
    bootchart_count = bootchart_init();
    if (bootchart_count < 0) {
        ERROR("bootcharting init failure\n");
+   queue_builtin_action(bootchart_init_action, "bootchart_init");
    } else if (bootchart_count > 0) {
        NOTICE("bootcharting started (period=%d ms)\n", bootchart_count*BOOTCHART_POLLING_MS);
    } else {
        NOTICE("bootcharting ignored\n");
    }

rootdir/init.rc
on post-fs-data
    # We chown/chmod /data again so because mount is run as root + defaults
    chown system system /data
    chmod 0771 /data
    # We restorecon /data in case the userdata partition has been reset.
    restorecon /data

+    write /data/bootchart-start 600
    # Avoid predictable entropy pool. Carry over entropy from previous boot.
    copy /data/system/entropy.dat /dev/urandom

/system/core/init/Android.mk

+ INIT_BOOTCHART :=true
ifeq ($(strip $(INIT_BOOTCHART)),true)
LOCAL_SRC_FILES += bootchart.c
LOCAL_CFLAGS    += -DBOOTCHART=1
endif

on post-fs-data
    # We chown/chmod /data again so because mount is run as root + defaults
    chown system system /data
    chmod 0771 /data
    # We restorecon /data in case the userdata partition has been reset.
    restorecon /data

    # start debuggerd to make debugging early-boot crashes easier.
    start debuggerd
    start debuggerd64

    # Make sure we have the device encryption key.
    start vold
    installkey /data

    # Start bootcharting as soon as possible after the data partition is
    # mounted to collect more data.
    mkdir /data/bootchart 0755 shell shell
    # if you need to enable bootchart uncomment next line
    # Old Android
    # write /data/bootchart-start 120 
    # Android > 7.0
    # write /data/bootchart/start 120 
    bootchart_init