Messages in this thread | | | Date | Thu, 3 Jul 2003 18:36:12 -0700 | From | William Lee Irwin III <> | Subject | Re: What to expect with the 2.6 VM |
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On Thu, Jul 03, 2003 at 03:21:13PM -0700, William Lee Irwin III wrote: >> It's obvious what to do about protections.
On Fri, Jul 04, 2003 at 02:46:41AM +0200, Andrea Arcangeli wrote: > so you agree it'd better be a separate syscall, also given it seems > the current remap_file_pages api in 2.5 seems unfortunately already > frozen since I think it's wrong as it should only work on VM_NONLINEAR > vmas, it's very unclean to allow remap_file_pages to mangle whatever vma > out there despite it has to deal with truncate etc.. I think the minium > required change to the API is to add a MAP_NONLINEAR that converts in > kernel space to a VM_NONLINEAR. You allocate the mapping with > mmap(MAP_NONLINAER) and only then remap_file_pages will work. This > solves all the current brekages (and it'll be trivial to skip over > VM_NONLINEAR in the 2.4 vm too). (then there's the rmap/mlock/munlock > issue but that's an implementation issue non visible from userspace > [modulo security with the sysctl], this one instead is a API bug IMHO > and it'd better be fixed before people puts the backport in production)
sys_chattr_file_pages() etc. sounds fine to me; GC's would love it.
I'll tackle the rest in another (somewhat more inflammatory) post.
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