Using page cache without a file system

Hi, Is it possible to allocate and add pages to the page cache without a underlying file system in Linux 2.4? I know that the host pointer to inode structure inside the address_space structure can be NULL, but does this mean that we can still make use of page cache operations like readpage or

How does ramfs actually fills the page cache with data?

In fs/ramfs/inode.c, how does ramfs actually fills the page cache with data? In the readpage operation, it only zero-fill the page if it didn't already exist in the page cache. However, how do I actually fill the page with data? Thanks a lot. __

Re: How does ramfs actually fills the page cache with data?

he page cache, what would you do? 2)The ramfs uses the generic file operation Ingo Oeser <[EMAIL PROTECTED]> wrote: > > On Fri, Jun 22, 2001 at 05:45:27PM -0400, Ho Chak Hung wrote: > > In fs/ramfs/inode.c, how does ramfs actually fills the page > > cache with data? In the r

Difference between get_free_page() and page_cache_alloc() ?

get_free_page() returns a pointer to a page while page_cache_alloc returns a pointer to a page struct. Is page_cache_alloc more efficient than get_free_page()? Also, does get_free_page returns a pointer to a contiguous block of physical memory? Thanks __

Difference between get_free_page() and page_cache_alloc() ?

Never mind.. I figured it out. __ Get your own FREE, personal Netscape Webmail account today at http://webmail.netscape.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAI

about get_zeroed_page() and page_address()

In the get_zeroed_page()function, address = page_address(page) 1)Does address point to a contiguous block of 4KB of physical memory? i.e.can I access the individual bytes by *address++? 2)How is page_address() function defined? I did a grep and found something like: #define page_address(page

Is an outside module supposed to use page cache?

Hi, I am trying to develop a module that makes use of the page cache(by allocating a LOT of pages use page_cache_alloc and then add_to_page_cache). However, I got some unresolved symbols error during insmod.(because the symbols related to lru_cache_add etc are not exported?) . I am just wo

__alloc_pages: 4-order allocation failed

Hi, I got the error __alloc_pages: 4-order allocation failed in a module that uses and frees a lot of pages. Basically, I am trying implement a page cache for the module. First, I keep allocating pages using page_cache_alloc() until it fails, then I free a whole bunch of pages using freepages(