system/freebsd-src
system/freebsd-src
1
0
Fork 0
mirror of https://github.com/freebsd/freebsd-src synced 2024-10-17 22:04:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

Update to reflect recent changes such as the fields for O(log n) address

Browse source 
space allocation.

Submitted by: Mark W. Krentel
This commit is contained in:
Alan Cox 2004-09-15 18:41:10 +00:00
parent 915996978d
commit acf359aa98
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=135270
1 changed files with 33 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

43
share/man/man9/vm_map.9
View file

@ -52,17 +52,18 @@ function.
.Bd -literal -offset indent
struct vm_map {
struct vm_map_entry header;
struct lock lock;
struct sx lock;
struct mtx system_mtx;
int nentries;
vm_size_t size;
u_int timestamp;
u_char needs_wakeup;
u_char system_map;
u_char infork;
vm_flags_t flags;
vm_map_entry_t root;
unsigned int timestamp;
vm_map_entry_t first_free;
pmap_t pmap;
#define min_offset header.start
#define max_offset header.end
};
.Ed
.Pp
@ -83,23 +84,38 @@ A mutex which is used if the map is a system map.
A count of the members in use within the circular map entry list.
.It Va size
Specifies the size of the virtual address space.
.It Va infork
Indicates if the map structure is currently undergoing fork processing.
.It Va timestamp
Used to determine if the map has changed since its last access.
.It Va needs_wakeup
Indicates if a thread is waiting for an allocation within the map.
Used only by system maps.
.It Va system_map
Set to TRUE to indicate that map is a system map; otherwise, it belongs
to a user process.
.It Va flags
Map flags.
.It Va root
Root node of a binary search tree used for fast lookup of map entries.
.It Va timestamp
Used to determine if the map has changed since its last access.
.It Va first_free
Provides a hint to the first free space within the map.
.It Va pmap
Pointer to the underlying physical map with which this virtual map
is associated.
.It Va min_offset
The minimum
.Va vm_offset_t
in this map.
Programs should never use
.Va header.start
or
.Va header.end
directly, use
.Va min_offset
and
.Va max_offset
instead.
.It Va max_offset
The maximum
.Va vm_offset_t
in this map.
.El
.Pp
The following flags can be passed to
@ -141,6 +157,8 @@ struct vm_map_entry {
vm_offset_t start;
vm_offset_t end;
vm_offset_t avail_ssize;
vm_size_t adj_free;
vm_size_t max_free;
union vm_map_object object;
vm_ooffset_t offset;
vm_eflags_t eflags;
@ -171,6 +189,11 @@ Lower address bound of this entry's region.
Upper address bound of this entry's region.
.It Va avail_ssize
If the entry is for a process stack, specifies how much the entry can grow.
.It Va adj_free
The amount of free, unmapped address space adjacent to and immediately
following this map entry.
.It Va max_free
The maximum amount of contiguous free space in this map entry's subtree.
.It Va object
Pointer to the
.Vt struct vm_map_object