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一部の Linux カーネルのスケジューリングに関して疑問があります。

1) Does linux kernel(schedular to be specific) always runs on CPU-0?
2) One Scenario:    
   One kernel thread running on CPU - 0, goes into sleep with interrupts disabled.    
   In this case, will the schedular run on other CPU? 
   if Yes, how is the selection made out of the remaining core so as to which will run     
   the schedular, is this decision made while disabling interrupts on CPU - 0?
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