src/sys/vm, branch release/4.1.0

MFC: merge in various cosmetic cleanups:

2000-07-19T06:24:06Z

Add unsigned sysctl types; change certain existing sysctl oids to utilize the new types. Teach sysctl(8) about these types. Convert SYSCTL_LONG to accept a val parameter like all of the other SYSCTL_XXX macros. Add support to sysctl(8) for arrays of longs. Make sysctl(8) display dev_t's the same way as ls(1).

MFC 1.175: vm_object_shadow(): Remove an incorrect assertion.

2000-07-13T08:30:31Z

MFC 1.158, fix minor bug in vm_pageout_page_stats()

2000-05-29T17:45:03Z

MFC 1.190 - fix bug in madvise MADV_WILLNEED

2000-05-15T16:45:40Z

Reviewd by: alc Tested by: "Sean O'Connell"

MFC swap_pager.c 1.137, vm_pageout.c 1.54, vm_pager.h 1.25. Add

2000-03-27T21:34:45Z

necessary spl protection. Approved by: jkh

MFC: Remove MAX_PERF with extreme prejudice.

2000-03-17T10:47:36Z

Add MAP_NOCORE to mmap(2), and MADV_NOCORE and MADV_CORE to madvise(2).

2000-02-28T04:10:35Z

This This feature allows you to specify if mmap'd data is included in an application's corefile. Change the type of eflags in struct vm_map_entry from u_char to vm_eflags_t (an unsigned int). Reviewed by: dillon,jdp,alfred Approved by: jkh

Fix null-pointer dereference crash when the system is intentionally

2000-02-16T21:11:33Z

run out of KVM through a mmap()/fork() bomb that allocates hundreds of thousands of vm_map_entry structures. Add panic to make null-pointer dereference crash a little more verbose. Add a new sysctl, vm.max_proc_mmap, which specifies the maximum number of mmap()'d spaces (discrete vm_map_entry's in the process). The value defaults to around 9000 for a 128MB machine. The test is scaled for the number of processes sharing a vmspace (aka linux threads). Setting the value to 0 disables the feature. PR: kern/16573 Approved by: jkh

The swapdev_vp changes made to rip out the swap specfs interaction

2000-01-25T17:49:12Z

also broke diskless swapping. Moving the swapdev_vp initialization to more commonly run code solves the problem. PR: kern/16165 Additional testing by: David Gilbert

Fix a deadlock between msync(..., MS_INVALIDATE) and vm_fault. The

2000-01-21T20:17:01Z

invalidation code cannot wait for paging to complete while holding a vnode lock, so we don't wait. Instead we simply allow the lower level code to simply block on any busy pages it encounters. I think Yahoo may be the only entity in the entire world that actually uses this msync feature :-). Bug reported by: Paul Saab