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memory: use a new FlatView pointer on every topology update 

This is the first step towards converting as->current_map to
RCU-style updates, where the FlatView updates run concurrently
with uses of an old FlatView.

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-05-06 10:29:07 +02:00
parent 99e86347fe
commit a9a0c06dd7
1 changed files with 18 additions and 16 deletions
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34
memory.c
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@ -276,6 +276,7 @@ static void flatview_destroy(FlatView *view)
memory_region_unref(view->ranges[i].mr);
}
g_free(view->ranges);
g_free(view);
}
static bool can_merge(FlatRange *r1, FlatRange *r2)
@ -512,17 +513,18 @@ static void render_memory_region(FlatView *view,
}
/* Render a memory topology into a list of disjoint absolute ranges. */
static FlatView generate_memory_topology(MemoryRegion *mr)
static FlatView *generate_memory_topology(MemoryRegion *mr)
{
FlatView view;
FlatView *view;
flatview_init(&view);
view = g_new(FlatView, 1);
flatview_init(view);
if (mr) {
render_memory_region(&view, mr, int128_zero(),
render_memory_region(view, mr, int128_zero(),
addrrange_make(int128_zero(), int128_2_64()), false);
}
flatview_simplify(&view);
flatview_simplify(view);
return view;
}
@ -610,8 +612,8 @@ static void address_space_update_ioeventfds(AddressSpace *as)
}
static void address_space_update_topology_pass(AddressSpace *as,
FlatView old_view,
FlatView new_view,
const FlatView *old_view,
const FlatView *new_view,
bool adding)
{
unsigned iold, inew;
@ -621,14 +623,14 @@ static void address_space_update_topology_pass(AddressSpace *as,
* Kill ranges in the old map, and instantiate ranges in the new map.
*/
iold = inew = 0;
while (iold < old_view.nr || inew < new_view.nr) {
if (iold < old_view.nr) {
frold = &old_view.ranges[iold];
while (iold < old_view->nr || inew < new_view->nr) {
if (iold < old_view->nr) {
frold = &old_view->ranges[iold];
} else {
frold = NULL;
}
if (inew < new_view.nr) {
frnew = &new_view.ranges[inew];
if (inew < new_view->nr) {
frnew = &new_view->ranges[inew];
} else {
frnew = NULL;
}
@ -674,14 +676,14 @@ static void address_space_update_topology_pass(AddressSpace *as,
static void address_space_update_topology(AddressSpace *as)
{
FlatView old_view = *as->current_map;
FlatView new_view = generate_memory_topology(as->root);
FlatView *old_view = as->current_map;
FlatView *new_view = generate_memory_topology(as->root);
address_space_update_topology_pass(as, old_view, new_view, false);
address_space_update_topology_pass(as, old_view, new_view, true);
*as->current_map = new_view;
flatview_destroy(&old_view);
as->current_map = new_view;
flatview_destroy(old_view);
address_space_update_ioeventfds(as);
}