![]() Theįlag is a message to the kernel that the scheduler should be invoked as soon as That it is set, and call schedule() to switch to a new process. The currently running process is awakened. Thisįlag is set by scheduler_tick() when a process runs out of timesliceĪnd by try_to_wake_up() when a process that has a higher priority than Instead, the kernel provides the need_reschedįlag to signify whether a reschedule should be performed (See Table 3.2). If it onlyĬalled schedule() when code explicitly did so, user-space programsĬould run indefinitely. The kernel, however, must know when to call schedule(). This involves saving and restoring stack information and the Switch the processor state from the previous process's to theĬurrent's. The previous process's to that of the new process.Ĭalls switch_to(), defined in include/asm/system.h, to Include/asm/mmu_context.h, to switch the virtual memory mapping from It is called by schedule() when a new process Handled by the context_switch() function defined in Learn More Buy Preemption and Context SwitchingĬontext switching, the switching from one runnable task to another, is ![]()
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