Brian Xu - Sun Microsystems - Beijing China ??:
> Brian Xu - Sun Microsystems - Beijing China ??:
>
>> shu ming ??:
>>
>>
>>> Here is the example:
>>>
>>> ID ADDR FLG NRUN BSPL PRI RNRN KRNRN SWITCH THREAD
>>> PROC
>>> 0 fffffffffbc259b0 1b 1 0 -1 no no t-0 ffffff0003e05c80
>>> (idle)
>>> | |
>>> RUNNING <--+ +--> PRI THREAD PROC
>>> READY
>>> EXISTS
>>> ENABLE
>>>
>>> I was told that SWITCH stood for the ticks passed when the thread was on
>>> CPU in one second base. Is it correct?
>>>
>>>
>> Should be correct. It stands for the last time a new thread is switched
>> onto the CPU, that is the time the current thread runs on the CPU.
>>
>>
> The time is a time point, not a time period instead. It is set as lbolt.
>
The info the mdb provides means the time period the current thread on
the CPU lasts. the cpu_last_swtch records the time when the thread is
switched onto the CPU.
This is what mdb means in the code:
mdb_printf("t-%-4d ", lbolt - cpu->cpu_last_swtch);
-Brian
> -Brian
>
>
>
>>> Can somebody explain it in more detail? And how can I know where SWITCH is
>>> from cpu struct?
>>>
>>>
>>>
>> clock_t cpu_last_swtch; /* last time switched to new thread */
>>
>>
>> -Brian
>>
>>
>>>
>>>
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