Justus Winter, le Wed 30 Apr 2014 21:10:47 +0200, a écrit : > 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.
Ack. > * vm/vm_map.h (struct vm_map): Use a bit field for the boolean flags > wait_for_space and wiring_required. > --- > vm/vm_map.h | 7 +++++-- > 1 file 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 */ > }; > > -- > 1.9.2 > -- Samuel Hi ! I'm a .signature virus ! Copy me into your ~/.signature, please !