$ dmesg | grep clock
[0.000000] OMAP clocksource: GPTIMER1 at 24000000 Hz
[0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
这里的精度是41ns
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原文：http://blog.csdn.net/robertsong2004/article/details/37902451