Alan Cox 5730afc9b6 Handle spurious page faults that may occur in no-fault sections of the ... kernel. When access restrictions are added to a page table entry, we flush the corresponding virtual address mapping from the TLB. In contrast, when access restrictions are removed from a page table entry, we do not flush the virtual address mapping from the TLB. This is exactly as recommended in AMD's documentation. In effect, when access restrictions are removed from a page table entry, AMD's MMUs will transparently refresh a stale TLB entry. In short, this saves us from having to perform potentially costly TLB flushes. In contrast, Intel's MMUs are allowed to generate a spurious page fault based upon the stale TLB entry. Usually, such spurious page faults are handled by vm_fault() without incident. However, when we are executing no-fault sections of the kernel, we are not allowed to execute vm_fault(). This change introduces special-case handling for spurious page faults that occur in no-fault sections of the kernel. In collaboration with: kib Tested by: gibbs (an earlier version) I would also like to acknowledge Hiroki Sato's assistance in diagnosing this problem. MFC after: 1 week		2012-03-22 04:52:51 +00:00
..
default_pager.c	Replace pointer to "struct uidinfo" with pointer to "struct ucred"	2010-12-02 17:37:16 +00:00
device_pager.c	Update the device pager interface, while keeping the compatibility	2011-11-15 14:40:00 +00:00
memguard.c	Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.	2011-11-07 15:43:11 +00:00
memguard.h	Make memguard(9) capable to guard uma(9) allocations.	2011-10-12 18:08:28 +00:00
phys_pager.c	Remove unneeded includes of <sys/linker_set.h>. Other headers that use	2011-01-11 13:59:06 +00:00
pmap.h	Sort function prototypes.	2011-01-16 20:40:50 +00:00
redzone.c	Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.	2011-11-07 15:43:11 +00:00
redzone.h
sg_pager.c	Eliminate duplication of the fake page code and zone by the device and sg	2011-03-11 07:07:48 +00:00
swap_pager.c	Remove direct access to si_name.	2012-02-10 12:35:57 +00:00
swap_pager.h	Implement the linprocfs swaps file, providing information about the	2011-08-01 19:12:15 +00:00
uma_core.c	exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64	2012-01-27 20:18:31 +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	1. Prior to r214782, UMA did not support multipage allocations before	2011-05-21 17:43:43 +00:00
uma.h	exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64	2012-01-27 20:18:31 +00:00
vm_contig.c	In vm_object_page_clean(), do not clean OBJ_MIGHTBEDIRTY object flag	2012-03-17 23:00:32 +00:00
vm_extern.h	Eliminate vm_phys_bootstrap_alloc(). It was a failed attempt at	2011-10-30 05:06:14 +00:00
vm_fault.c	Handle spurious page faults that may occur in no-fault sections of the	2012-03-22 04:52:51 +00:00
vm_glue.c	Move kstack_cache_entry into the private header, and make the	2011-12-16 10:56:16 +00:00
vm_init.c	Introduce exec_alloc_args(). The objective being to encapsulate the	2010-07-27 17:31:03 +00:00
vm_kern.c	Simplify kmem_alloc() by eliminating code that existed on account of	2012-02-29 05:41:29 +00:00
vm_kern.h
vm_map.c	Fix madvise(MADV_WILLNEED) to properly handle individual mappings larger	2012-03-19 18:47:34 +00:00
vm_map.h	Account the writeable shared mappings backed by file in the vnode	2012-02-23 21:07:16 +00:00
vm_meter.c	- The previous commit (r228449) accidentally moved the vm.stats.vm.* sysctls	2011-12-14 13:25:00 +00:00
vm_mmap.c	In vm_object_page_clean(), do not clean OBJ_MIGHTBEDIRTY object flag	2012-03-17 23:00:32 +00:00
vm_object.c	Fix madvise(MADV_WILLNEED) to properly handle individual mappings larger	2012-03-19 18:47:34 +00:00
vm_object.h	Fix madvise(MADV_WILLNEED) to properly handle individual mappings larger	2012-03-19 18:47:34 +00:00
vm_page.c	exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64	2012-01-27 20:18:31 +00:00
vm_page.h	exclude kmem_alloc'ed ARC data buffers from kernel minidumps on amd64	2012-01-27 20:18:31 +00:00
vm_pageout.c	In vm_object_page_clean(), do not clean OBJ_MIGHTBEDIRTY object flag	2012-03-17 23:00:32 +00:00
vm_pageout.h	In vm_object_page_clean(), do not clean OBJ_MIGHTBEDIRTY object flag	2012-03-17 23:00:32 +00:00
vm_pager.c	Remove the condition that is always true.	2011-11-15 14:09:53 +00:00
vm_pager.h	Update the device pager interface, while keeping the compatibility	2011-11-15 14:40:00 +00:00
vm_param.h	On Alan's advice, rather than do a wholesale conversion on a single	2010-04-30 00:46:43 +00:00
vm_phys.c	Bah, just revert my earlier change entirely. (Missed alc's request to do	2012-03-19 19:06:40 +00:00
vm_phys.h	Refactor the code that performs physically contiguous memory allocation,	2011-11-16 16:46:09 +00:00
vm_reserv.c	Introduce vm_reserv_alloc_contig() and teach vm_page_alloc_contig() how to	2011-12-05 18:29:25 +00:00
vm_reserv.h	Introduce vm_reserv_alloc_contig() and teach vm_page_alloc_contig() how to	2011-12-05 18:29:25 +00:00
vm_unix.c	Control the execution permission of the readable segments for	2011-10-15 12:35:18 +00:00
vm_zeroidle.c	Split P_NOLOAD into a per-thread flag (TDF_NOLOAD).	2009-11-03 16:46:52 +00:00
vm.h	Replace pointer to "struct uidinfo" with pointer to "struct ucred"	2010-12-02 17:37:16 +00:00
vnode_pager.c	Add KTR_VFS traces to track modifications to a vnode's writecount.	2012-03-08 20:27:20 +00:00
vnode_pager.h	Account the writeable shared mappings backed by file in the vnode	2012-02-23 21:07:16 +00:00