buffer head and buffer pages

["Raghu R. Arur" <rra2002@aria.ncl.cs.columbia.edu>]

  Hi,

  Please help me to understand this better. each buffer has a buffer
head. the b_page of buffer_head points to the page that contains the
mapped data. Will both these pages ( the page that holds the buffer_head
structure and buffer page that contains the actual data) mapped to the
process OR only the page with the buffer_head is mapped to the process ?
In other words, the rss value of the process accounts for both these pages
or it accounts for only the page with the buffer_head ?

 Thanks a lot,
 Raghu
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