Linux hibernate的简单过程

最新推荐文章于 2025-05-17 22:39:25 发布

原创最新推荐文章于 2025-05-17 22:39:25 发布 · 2.9k 阅读

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文章标签：

#hibernate #linux #image

本文概述了Linux系统休眠(hibernate)的过程，重点在于CPU的操作。休眠过程涉及`kernel/power/hibernate.c`中的函数，包括`disable_nonboot_cpus`，通过`__cpu_disable`和`__cpu_die`等步骤来关闭非启动CPU，保存并恢复处理器状态。软件恢复阶段由`hibernation_restore`驱动，调用`resume_target_kernel`和`swsusp_arch_resume`进行恢复操作。

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这几天应上级只要求，survey一下Linux的hibernate，侧重于CPU的operation。

有一份PPT可以参考，可惜不能下载，链接是：

http://www.slideshare.net/varunmahajan06/hibernation-linux-2629

进去之后，如果有问题，那你自己在网站中search“Linux Hibernate”这2个关键字，就能找到。

另外，我整理出了一个简单的代码树，供大家参考。

hibernate    (kernel/power/hibernate.c)
    |- hibernation_snapshot
    |    |- create_images
    |        |- disable_nonboot_cpus        (kernel/cpu.c)
    |        |    |- _cpu_down
    |        |    |    |- take_cpu_down
    |        |    |    |    |- __cpu_disable    (arch/x86/include/asm/smp.h)    // Ensure this CPU doesn't handle any more interrupts
    |        |    |    |        |- native_cpu_disable    (arch/x86/kernel/Smpboot.c)
    |        |    |    |- __cpu_die    (arch/x86/include/asm/smp.h)    // This actually kills the CPU
    |        |    |        |- native_cpu_die    (arch/x86/kernel/Smpboot.c)
    |        |    |
    |        |    |- cpumask_set_cpu    (include/linux/cpumask.h)
    |        |
    |        |- in_suspend = 1;
    |        |
    |        |- save_processor_state        (arch/x86/power/cpu.c)
    |        |    |- __save_processor_state
    |        |
    |        |- swsusp_arch_suspend    (arch/x86/power/hibernate_asm_32.S)
    |        |    |- swsusp_save    (kernel/power/snapshot.c)
    |        |
    |        |- restore_processor_state    (arch/x86/power/cpu.c)
    |        |
    |        |- enable_nonboot_cpus        (kernel/cpu.c)
    |
    |-     if (in_suspend)
        {
            swsusp_write;
            power_down;
            in_suspend = 0;
        }




software_resume    (kernel/power/hibernate.c)
    |- hibernation_restore        // If successful, control returns after hibernation_snapshot->create_images->swsusp_arch_suspend
        |- resume_target_kernel
            |- disable_nonboot_cpus        (kernel/cpu.c)
            |- swsusp_arch_resume        (arch/x86/power/Hibernate_32.c)
            |    |- restore_image    (arch/x86/power/hibernate_asm_32.S)
            |- // The code below is only ever reached in case of a failure.