Wang Yu 写道:
Hi, all
First, I want to verify a statement: every opened file has a page
cache in memory, there is a struct address_space object associated
with it and the inode of the opened file has a field i_mapping
pointing to the page cache. If processes in system read or write N
files concurrently, there are N page caches in memory. Is this
statement right?
page cache mechanism is not related to any specific file , but a
system-wide thing .
Second, are there some limits about a page cache of a file? for
example, the number of pages in page cache?
The system's page cache capacity is limited by low memory pressure, when
kswapd is waken up(furthermore ,there's other situation exists),the page
cache can be shrinked.
Every zone has its low watermark about low memory warning.When reached ,
recliaming occurs.
Thanks!
Best Regards
--
National Research Center for Intelligent Computing Systems
Institute of Computing Technology, Chinese Academy of Sciences
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