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This chapter introduced the following symbols include lt linux param.h gt HZ The HZ symbol specifies the number of clock ticks generated per second. include lt linux sched.h gt volatile unsigned long jiffies The jiffies variable is incremented once for each clock tick thus, it's incremented HZ times per second. Read the timestamp counter or its lower half. The header and macros are specific to PC-class processors other platforms may need asm constructs to achieve similar results. The current...