Messages in this thread | | | Date | Mon, 17 Mar 2003 07:10:04 -0800 | From | William Lee Irwin III <> | Subject | Re: 2.4 vm, program load, page faulting, ... |
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On Sat, 15 Mar 2003, Paul Albrecht wrote: >> ... Why does the kernel page fault on text pages, present in the page >> cache, when a program starts? Couldn't the pte's for text present in the >> page cache be resolved when they're mapped to memory?
On Mon, Mar 17, 2003 at 10:02:21AM -0500, Rik van Riel wrote: > The mmap() syscall only sets up the VMA info, it doesn't > fill in the page tables. That only happens when the process > page faults. > Note that filling in a bunch of page table entries mapping > already present pagecache pages at exec() time might be a > good idea. It's just that nobody has gotten around to that > yet...
SVR4 did and saw an improvement wrt. page fault rate, according to Vahalia.
I'd like to see whether this is useful for Linux.
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