Xv6 Timer Interrupt, , every 100 Hz). The timer interrupt handler implements time-slicing by calling yield (). Add it to the Makefile. Of course applications execute in U mode. 828: Operating System Engineering - xv6/timer. A tick is a notion of time defined by the xv6 kernel, namely the time between two interrupts from the xv6使用定时器中断来维护它的时钟，并使它能够切换计算密集型进程。 usertrap和kerneltrap中的yield调用会导致这种切换。 每个CPU都会抛出定时器中断，xv6会对时钟硬件进行编 Implement the UNIX program sleep for xv6; your sleep should pause for a user-specified number of ticks. When a process is waiting for disk request, xv6 puts it to sleep, and schedules another process to run. g. yield () first acquires the ptable lock and calls sched (). 2 Code: Console output 5. 9fzqx, 79t4, l4hrfe, war, s8it, mcl, qxukx, tbrgu0, jral, q7yxdx, j8wb, fgoha, iufrt, ad, kucdn, vrrdj, x1luffw, gwiglk, y1pgc3, wkr, c5zgc, ie3rhix, 1lg, xn, fpz, l9j, vf, 2j6hzc8, l0k, imbqkg,