src-test2/sys/vm/vm_map.h, branch release/8.4.0

MFC r238502:

2012-08-22T17:16:05Z

Fix a bug with memguard(9) on 32-bit architectures without a VM_KMEM_MAX_SIZE. The code was not taking into account the size of the kernel_map, which the kmem_map is allocated from, so it could produce a sub-map size too large to fit. The simplest solution is to ignore VM_KMEM_MAX entirely and base the memguard map's size off the kernel_map's size, since this is always relevant and always smaller. Found by: Justin Hibbits

MFC r218966, r219124:

2011-03-04T20:26:35Z

Change the return type of vmspace_swap_count to a long to match the other vmspace_*_count functions. While here, clean up some style(9) issues. PR: kern/152200

MFC 214144:

2011-01-25T19:44:42Z

- Make 'vm_refcnt' volatile so that compilers won't be tempted to treat its value as a loop invariant. Currently this is a no-op because 'atomic_cmpset_int()' clobbers all memory on current architectures. - Use atomic_fetchadd_int() instead of an atomic_cmpset_int() loop to drop a reference in vmspace_free().

MFC r216335:

2010-12-19T06:07:35Z

Fix a long standing (from the original 4.4BSD lite sources) race between vmspace_fork and vm_map_wire that would lead to "vm_fault_copy_wired: page missing" panics. While faulting in pages for a map entry that is being wired down, mark the containing map as busy. In vmspace_fork wait until the map is unbusy, before we try to copy the entries. Sponsored by: Isilon Systems, Inc. Approved by: re (kib)

Merge MIPS platform support to 8-STABLE.

2010-11-27T12:26:40Z

This commit merges the MIPS platform changes that was now stable in -CURRENT into 8-STABLE. The MIPS changesets are too many (~400) to list here. But the changesets merged in this commit that affect other platforms are summarized below: r204635 : (changes to sys/dev/hwpmc, lib/libpmc, sys/sys/pmc.h) Add support for hwpmc(4) on the MIPS 24K, 32 bit, embedded processor. r205845: (changes to sys/modules/Makefile) Fix for building modules on mips and arm. r204031: (changes to sys/kern/link_elf_obj.c) printf fix, as part of kernel module support for MIPS. r206404: (changes to sys/arm/include/bus.h) Add BUS_SPACE_UNRESTRICTED and define it to be ~0, just like all the other platforms - for arm and mips. r206819: (changes to sys/vm/) Add VMFS_TLB_ALIGNED_SPACE option and kmem_alloc_nofault_space(), which is used to allocate kernel stack address on MIPS. r208165, r211087: (sys/kern/subr_smp.c, sys/kern/sched_ule.c) Enable ULE scheduler for MIPS, Fix for an issue in SMP when 32 cpus are enabled. r208659: (sys/{ia64/ia64,mips/mips,sun4v/sun4v}/pmap.c) Simplify the inner loop of get_pv_entry() r208794: (changes to sys/vm/) Make vm_contig_grow_cache() extern, and use it when vm_phys_alloc_contig() fails to allocate MIPS page table pages. r210327: (changes to sys/vm/) Support for MIPS page table page allocation. Add a new function 'vm_page_t vm_page_alloc_freelist(int flind, int order, int req)' to vm/vm_page.c to allocate a page from a specified freelist, and other related changes. Reviewed by: alc(vm changes only) Approved by: kib(re), alc(vm), imp(mips), jmallett(mips), gnn(mips pmc)

MFC r212824:

2010-10-02T17:41:47Z

Adopt the deferring of object deallocation for the deleted map entries on map unlock to the lock downgrade and later read unlock operation. MFC r212868 (by alc) [1]: Make refinements to r212824. Redo the implementation of vm_map_unlock_and_wait(). Approved by: alc [1]

Implement global and per-uid accounting of the anonymous memory. Add

2009-06-23T20:45:22Z

rlimit RLIMIT_SWAP that limits the amount of swap that may be reserved for the uid. The accounting information (charge) is associated with either map entry, or vm object backing the entry, assuming the object is the first one in the shadow chain and entry does not require COW. Charge is moved from entry to object on allocation of the object, e.g. during the mmap, assuming the object is allocated, or on the first page fault on the entry. It moves back to the entry on forks due to COW setup. The per-entry granularity of accounting makes the charge process fair for processes that change uid during lifetime, and decrements charge for proper uid when region is unmapped. The interface of vm_pager_allocate(9) is extended by adding struct ucred *, that is used to charge appropriate uid when allocation if performed by kernel, e.g. md(4). Several syscalls, among them is fork(2), may now return ENOMEM when global or per-uid limits are enforced. In collaboration with: pho Reviewed by: alc Approved by: re (kensmith)

When vm_map_wire(9) is allowed to skip holes in the wired region, skip

2009-04-10T10:16:03Z

the mappings without any of read and execution rights, in particular, the PROT_NONE entries. This makes mlockall(2) work for the process address space that has such mappings. Since protection mode of the entry may change between setting MAP_ENTRY_IN_TRANSITION and final pass over the region that records the wire status of the entries, allocate new map entry flag MAP_ENTRY_WIRE_SKIPPED to mark the skipped PROT_NONE entries. Reported and tested by: Hans Ottevanger Reviewed by: alc MFC after: 3 weeks

Revert the addition of the freelist argument for the vm_map_delete()

2009-02-24T20:57:43Z

function, done in r188334. Instead, collect the entries that shall be freed, in the deferred_freelist member of the map. Automatically purge the deferred freelist when map is unlocked. Tested by: pho Reviewed by: alc

Do not call vm_object_deallocate() from vm_map_delete(), because we

2009-02-08T20:39:17Z

hold the map lock there, and might need the vnode lock for OBJT_VNODE objects. Postpone object deallocation until caller of vm_map_delete() drops the map lock. Link the map entries to be freed into the freelist, that is released by the new helper function vm_map_entry_free_freelist(). Reviewed by: tegge, alc Tested by: pho