Boot process "scheduler"

Where in the boot process does the "scheduler" get created and when created how can its instructions be acce开发者_如何学JAVAssed?

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That depends on the OS you use, but several things should be clear:

• before the first switch to userland
• before any kernel threads are started or any other multi-programming (multi-tasking) is done

Obviously that is relatively early in the boot process.

What exactly do you mean by "how can its instructions be accessed?"?

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the default scheduler is set in kernel config : adrian@adrian: ~ $ grep cfq /boot/config-2.6.36.2-desktop-2mnb CONFIG_DEFAULT_IOSCHED="cfq"

at boot time you can do in the kernel line as example: kernel /vmlinuz-2.6.18-8.el5 ro root=/dev/sda2 elevator=deadline