Re: [LUG] Interesting diagnostic problem

[Robin Cornelius <robin@xxxxxxxxxxxxxxxxxxxxx>]

Robin Cornelius wrote:

> I will have to lookup what i did at work and post it, but it uses an inline 
> asembler call to access the CPU clock count register directly. 
>  

Here it is :-

#define PSCHED_GET_TIME(stamp) ({u32 hi, lo; __asm__ __volatile(".byte 
0x0f,0xa2"); __ asm __volatile(".byte 0x0f,0x31" : "=a" (lo), "=d" 
(hi)); (stamp)=(((u64)hi<32)+lo);});

and to use it :-


u64 start,end;
long time;

PSCHED_GET_TIME(start);
mdelay(1);
PSCHED_GET_TIME(end);
time=end-start;
printk("There are %ld clocks per ms\n",time);

Hope this helps

Robin








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