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pagingmore about paging

paging


  4  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Page  \Page\,  v.  t.  [imp.  &  p.  p.  {Paged};  p.  pr  &  vb  n. 
  {Paging}.] 
  To  mark  or  number  the  pages  of  as  a  book  or  manuscript;  to 
  furnish  with  folios. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Paging  \Pa"ging\,  n. 
  The  marking  or  numbering  of  the  pages  of  a  book. 
 
  From  WordNet  r  1.6  [wn]: 
 
  paging 
  n  :  calling  out  the  name  of  a  person  (especially  by  a 
  loudspeaker  system);  "the  public  address  system  in  the 
  hospital  was  used  for  paging" 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  paging 
 
    A  technique  for  increasing  the  memory  space 
  available  by  moving  infrequently-used  parts  of  a  program's 
  working  memory  from  {RAM}  to  a  secondary  storage  medium, 
  usually  disk.  The  unit  of  transfer  is  called  a  page. 
 
  A  {memory  management  unit}  (MMU)  monitors  accesses  to  memory 
  and  splits  each  address  into  a  page  number  (the  most 
  significant  bits)  and  an  offset  within  that  page  (the  lower 
  bits).  It  then  looks  up  the  page  number  in  its  page  table. 
  The  page  may  be  marked  as  paged  in  or  paged  out  If  it  is 
  paged  in  then  the  memory  access  can  proceed  after  translating 
  the  {virtual  address}  to  a  {physical  address}.  If  the 
  requested  page  is  paged  out  then  space  must  be  made  for  it  by 
  paging  out  some  other  page,  i.e.  copying  it  to  disk.  The 
  requested  page  is  then  located  on  the  area  of  the  disk 
  allocated  for  "{swap  space}"  and  is  read  back  into  {RAM}.  The 
  page  table  is  updated  to  indicate  that  the  page  is  paged  in 
  and  its  physical  address  recorded. 
 
  The  MMU  also  records  whether  a  page  has  been  modified  since  it 
  was  last  paged  in  If  it  has  not  been  modified  then  there  is 
  no  need  to  copy  it  back  to  disk  and  the  space  can  be  reused 
  immediately. 
 
  Paging  allows  the  total  memory  requirements  of  all  running 
  tasks  (possibly  just  one)  to  exceed  the  amount  of  {physical 
  memory},  whereas  {swapping}  simply  allows  multiple  processes 
  to  run  concurrently,  so  long  as  each  process  on  its  own  fits 
  within  {physical  memory}. 
 
  (1996-11-22) 
 
 




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