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| author | Justus Winter <4winter@informatik.uni-hamburg.de> | 2014-04-30 15:23:36 +0200 |
|---|---|---|
| committer | Justus Winter <4winter@informatik.uni-hamburg.de> | 2014-04-30 17:37:39 +0200 |
| commit | dca400e253df97804dd04b24e96aebba878781a0 (patch) | |
| tree | d6be6e3e0f3ae2a76ed60b39af9a0e97436a6148 | |
| parent | 4fda696b13d2d9fdb9496b2aeee1b05a6f852836 (diff) | |
vm: make struct vm_map fit into a cache line
Currently, the size of struct vm_map is 68 bytes. By using a bit
field for the boolean flags, it can be made fit into a cache line.
* vm/vm_map.h (struct vm_map): Use a bit field for the boolean flags
wait_for_space and wiring_required.
| -rw-r--r-- | vm/vm_map.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/vm/vm_map.h b/vm/vm_map.h index b6bc177..b8103eb 100644 --- a/vm/vm_map.h +++ b/vm/vm_map.h @@ -175,9 +175,12 @@ struct vm_map { vm_map_entry_t hint; /* hint for quick lookups */ decl_simple_lock_data(, hint_lock) /* lock for hint storage */ vm_map_entry_t first_free; /* First free space hint */ - boolean_t wait_for_space; /* Should callers wait + + /* Flags */ + unsigned int wait_for_space:1, /* Should callers wait for space? */ - boolean_t wiring_required;/* All memory wired? */ + /* boolean_t */ wiring_required:1; /* All memory wired? */ + unsigned int timestamp; /* Version number */ }; |