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freebsd-dev/sys/vm
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Alan Cox beb3c3a9c5 Retire VM_PROT_READ_IS_EXEC. It was intended to be a micro-optimization, 
but I see no benefit from it today.

VM_PROT_READ_IS_EXEC was only intended for use on processors that do not
distinguish between read and execute permission.  On an mmap(2) or
mprotect(2), it automatically added execute permission if the caller
specified permissions included read permission.  The hope was that this
would reduce the number of vm map entries needed to implement an address
space because there would be fewer neighboring vm map entries that differed
only in the presence or absence of VM_PROT_EXECUTE.  (See vm/vm_mmap.c
revision 1.56.)

Today, I don't see any real applications that benefit from
VM_PROT_READ_IS_EXEC.  In any case, vm map entries are now organized
as a self-adjusting binary search tree instead of an ordered list.  So,
the need for coalescing vm map entries is not as great as it once was.
2009-04-04 23:12:14 +00:00
..
default_pager.c
device_pager.c Save previous content of the td_fpop before storing the current 2008-09-26 14:50:49 +00:00
memguard.c Provide the new argument to kmem_suballoc(). 2008-05-10 23:39:27 +00:00
memguard.h Improve memguard a bit: 2005-12-30 11:45:07 +00:00
phys_pager.c Correct a copy and paste'o in phys_pager.c, we are talking about phys here 2007-10-30 14:48:13 +00:00
pmap.h Retire pmap_addr_hint(). It is no longer used. 2008-05-18 04:16:57 +00:00
redzone.c Fix REDZONE(9) on amd64 and perhaps other 64 bit targets -- ensure the space 2008-08-13 17:32:48 +00:00
redzone.h Add buffer corruption protection (RedZone) for kernel's malloc(9). 2006-01-31 11:09:21 +00:00
swap_pager.c Eliminate stale comments. 2009-02-20 16:19:34 +00:00
swap_pager.h - Move 'struct swdevt' back into swap_pager.h and expose it to userland. 2007-02-07 17:43:11 +00:00
uma_core.c - Make the keg abstraction more complete. Permit a zone to have multiple 2009-01-25 09:11:24 +00:00
uma_dbg.c - Make the keg abstraction more complete. Permit a zone to have multiple 2009-01-25 09:11:24 +00:00
uma_dbg.h
uma_int.h - Make the keg abstraction more complete. Permit a zone to have multiple 2009-01-25 09:11:24 +00:00
uma.h - Make the keg abstraction more complete. Permit a zone to have multiple 2009-01-25 09:11:24 +00:00
vm_contig.c VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used in 2008-01-13 14:44:15 +00:00
vm_extern.h Eliminate dead code. 2009-04-01 04:36:37 +00:00
vm_fault.c Prior to r188331 a map entry's last read offset was only updated by a hard 2009-02-25 07:52:53 +00:00
vm_glue.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
vm_init.c Adjust some variables (mostly related to the buffer cache) that hold 2009-03-09 19:35:20 +00:00
vm_kern.c Revert the addition of the freelist argument for the vm_map_delete() 2009-02-24 20:57:43 +00:00
vm_kern.h Enable the creation of a kmem map larger than 4GB. 2008-07-05 19:34:33 +00:00
vm_map.c Revert the addition of the freelist argument for the vm_map_delete() 2009-02-24 20:57:43 +00:00
vm_map.h Revert the addition of the freelist argument for the vm_map_delete() 2009-02-24 20:57:43 +00:00
vm_meter.c - Mark all standalone INT/LONG/QUAD sysctl's MPSAFE. This is done 2009-01-23 22:49:23 +00:00
vm_mmap.c Retire VM_PROT_READ_IS_EXEC. It was intended to be a micro-optimization, 2009-04-04 23:12:14 +00:00
vm_object.c Reduce the scope of the page queues lock in vm_object_page_remove(). 2009-02-21 20:57:25 +00:00
vm_object.h Eliminate OBJ_NEEDGIANT. After r188331, OBJ_NEEDGIANT's only use is by a 2009-02-08 22:17:24 +00:00
vm_page.c Extend the struct vm_page wire_count to u_int to avoid the overflow 2009-01-03 13:24:08 +00:00
vm_page.h Extend the struct vm_page wire_count to u_int to avoid the overflow 2009-01-03 13:24:08 +00:00
vm_pageout.c Instead of forcing vn_start_write() to reset mp back to NULL for the 2008-11-16 21:57:54 +00:00
vm_pageout.h Move the code for doing out-of-memory grass from vm_pageout_scan() 2008-09-29 19:45:12 +00:00
vm_pager.c Change the functions to ANSI in those cases where it breaks promotion 2009-02-24 18:09:31 +00:00
vm_pager.h
vm_param.h Fix CTL_VM_NAMES. 2007-10-16 11:32:57 +00:00
vm_phys.c Introduce vm_reserv_reclaim_contig(). This function is used by 2008-04-06 18:09:28 +00:00
vm_phys.h Modify vm_phys_unfree_page() so that it no longer requires the given 2007-12-20 22:45:54 +00:00
vm_reserv.c Introduce vm_reserv_reclaim_contig(). This function is used by 2008-04-06 18:09:28 +00:00
vm_reserv.h Introduce vm_reserv_reclaim_contig(). This function is used by 2008-04-06 18:09:28 +00:00
vm_unix.c Revert the addition of the freelist argument for the vm_map_delete() 2009-02-24 20:57:43 +00:00
vm_zeroidle.c Fill in a few sysctl descriptions. 2008-08-03 14:26:15 +00:00
vm.h Add the superpage reservation type. 2007-12-27 17:08:11 +00:00
vnode_pager.c Adjust some variables (mostly related to the buffer cache) that hold 2009-03-09 19:35:20 +00:00
vnode_pager.h Do not sleep for vnode lock while holding map lock in vm_fault. Try to 2009-02-08 20:23:46 +00:00