Alan Cox cf4682ae23 Eliminate the reactivation of cached pages in vm_fault_prefault() and ... vm_map_pmap_enter() unless the caller is madvise(MADV_WILLNEED). With the exception of calls to vm_map_pmap_enter() from madvise(MADV_WILLNEED), vm_fault_prefault() and vm_map_pmap_enter() are both used to create speculative mappings. Thus, always reactivating cached pages is a mistake. In principle, cached pages should only be reactivated by an actual access. Otherwise, the following misbehavior can occur. On a hard fault for a text page the clustering algorithm fetches not only the required page but also several of the adjacent pages. Now, suppose that one or more of the adjacent pages are never accessed. Ultimately, these unused pages become cached pages through the efforts of the page daemon. However, the next activation of the executable reactivates and maps these unused pages. Consequently, they are never replaced. In effect, they become pinned in memory.		2007-05-22 04:45:59 +00:00
..
default_pager.c
device_pager.c	Replace PG_BUSY with VPO_BUSY. In other words, changes to the page's	2006-10-22 04:28:14 +00:00
memguard.c	Improve memguard a bit:	2005-12-30 11:45:07 +00:00
memguard.h	Improve memguard a bit:	2005-12-30 11:45:07 +00:00
phys_pager.c	Minor typo fix, noticed while I was going through *_pager.c files.	2007-04-10 12:34:51 +00:00
pmap.h	Complete the transition from pmap_page_protect() to pmap_remove_write().	2006-08-01 19:06:06 +00:00
redzone.c	Add buffer corruption protection (RedZone) for kernel's malloc(9).	2006-01-31 11:09:21 +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	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +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	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
uma_dbg.c	Improve canonicalization of copyrights. Order copyrights by order of	2005-07-16 09:51:52 +00:00
uma_dbg.h	Improve canonicalization of copyrights. Order copyrights by order of	2005-07-16 09:51:52 +00:00
uma_int.h	Update stale comment on protecting UMA per-CPU caches: we now use	2007-05-09 22:53:34 +00:00
uma.h	Add uma_set_align() interface, which will be called at most once during	2007-02-11 20:13:52 +00:00
vm_contig.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm_extern.h	Close race between vmspace_exitfree() and exit1() and races between	2006-05-29 21:28:56 +00:00
vm_fault.c	Eliminate the reactivation of cached pages in vm_fault_prefault() and	2007-05-22 04:45:59 +00:00
vm_glue.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm_init.c
vm_kern.c	When KVA is exhausted, try the vm_lowmem event for the last time before	2007-04-05 20:52:51 +00:00
vm_kern.h	The clean_map has been made local to vm_init.c long ago.	2006-11-20 16:23:34 +00:00
vm_map.c	Eliminate the reactivation of cached pages in vm_fault_prefault() and	2007-05-22 04:45:59 +00:00
vm_map.h	Close race between vmspace_exitfree() and exit1() and races between	2006-05-29 21:28:56 +00:00
vm_meter.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm_mmap.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm_object.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm_object.h	Eliminate OBJ_WRITEABLE. It hasn't been used in a long time.	2006-07-21 06:40:29 +00:00
vm_page.c	- rename VMCNT_DEC to VMCNT_SUB to reflect the count argument.	2007-05-20 22:33:42 +00:00
vm_page.h	Define every architecture as either VM_PHYSSEG_DENSE or	2007-05-05 19:50:28 +00:00
vm_pageout.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm_pageout.h
vm_pageq.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm_pager.c	Normalize a significant number of kernel malloc type names:	2005-10-31 15:41:29 +00:00
vm_pager.h
vm_param.h	Correct two comments.	2007-04-19 04:52:47 +00:00
vm_unix.c
vm_zeroidle.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vm.h	Retire debug.mpsafevm. None of the architectures supported in CVS require	2006-07-21 23:22:49 +00:00
vnode_pager.c	- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating	2007-05-18 07:10:50 +00:00
vnode_pager.h