Bottom half

Computer/OS | 2007/05/09 10:47 | adioshun
Bottom half란 interrupt의  결과로  불려지는  커널내의 함수(routine)들의 집합이다.  프로세
스의  상태에  의존하지  않으며, sleep()과  같은  함수를  불러서  진행을  블록킹(blocking) 
할수  없다.  참고로  top  half란  시스템  콜이나  트랩(trap) 의  결과로  생기며,  동기적
(synchronous)으로  호출되는  커널내의  함수(routine)들  이다.  프로세스와  상태에  의존적이
며, sleep()함수를 부름으로써 블록킹 할 수 있다.
 
인터럽트의  발생시  이를  처리하는  모든  함수들이  불려질  필요는  없다.  즉,  바쁘고  중요한
일을 처리한 다음 나중에 덜 바쁜 일을 처리해 주도록 만들어줄 수 있다. 이와 같은 대표적
인 경우로 네트워크(network)에서 발생하는  패킷(packet)의 처리를  나중으로 미루어  둘 수
도 있을 것이다. 되도록 이면 많은 패킷을 놓치지 않고 빨리 받아서 큐에 넣어둔 다음 네트
워크  인터페이스  인터럽트를 처리했다고 알리고,  나중에 이 패킷들에 대한 처리를 다시 조
금 한가한 시간에 해주게 된다. 이럴 때 사용할 수 있는 것이 바로 bottom half이다. 따라서,
상대적으로 처리시간이 긴 것들은 이것을 이용해서 나중에 시스템에서 처리해 준다.  
 
커널  버전(version) 2.4에서는bottom half에 대한 처리가  많이 변경되었다. 즉, 소프트웨어
IRQ의 일환으로 처리된다. Bottom half의 초기화는  ~/kernel/softirq.c의 softirq_init()에서
bh_base 배열(array)에 init_bh()함수가 bottom half 핸들러 함수를 등록시켜주는 곳에서 일
어나며, bh_acton()함수에서 bottom half에 대한 처리를 해준다. 제거는  remove_bh() 함수
가  처리한다.  모든  시스템  콜이  복귀하기  전에 softirq와  mask를  가지고 softirq가  활성
(active)인지를  확인하게  되며,  만약  그럴  경우에는 do_softirq()  함수를  불러서 softirq를
처리한다.

2007/05/09 10:47 2007/05/09 10:47
trackbacks 122 : comments 5 :
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