Re: understanding applications and PAE
On Tue, Dec 09, 2003 at 12:00:38PM -0500, Nathan Bryant wrote:
Sounds like you could treat /dev/shm as a large, linear file and
mmap()
one window into it at a time...
And in RHEL3 and 2.6 kernel, that's what remap_file_pages is for -- a fast
remapping that doesn't trash vmas. Quoting from mm/fremap.c:
* this syscall works purely via pagetables, so it's the most efficient
* way to map the same (large) file into a given virtual window. Unlike
* mmap()/mremap() it does not create any new vmas. The new mappings are
* also safe across swapout.
michaelkjohnson
"He that composes himself is wiser than he that composes a book."
Linux Application Development -- Ben Franklin
http://people.redhat.com/johnsonm/lad/