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[Qemu-devel] [RFC PATCH 6/8] memory: use a new FlatView pointer on every
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [RFC PATCH 6/8] memory: use a new FlatView pointer on every topology update |
Date: |
Mon, 6 May 2013 16:25:19 +0200 |
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.
Signed-off-by: Paolo Bonzini <address@hidden>
---
memory.c | 34 ++++++++++++++++++----------------
1 files changed, 18 insertions(+), 16 deletions(-)
diff --git a/memory.c b/memory.c
index 553b04c..fbb2657 100644
--- a/memory.c
+++ b/memory.c
@@ -273,6 +273,7 @@ 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)
@@ -566,17 +567,18 @@ 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;
}
@@ -664,8 +666,8 @@ 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;
@@ -675,14 +677,14 @@ 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;
}
@@ -728,14 +730,14 @@ 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);
}
--
1.7.1
- [Qemu-devel] [RFC PATCH 0/8] MemoryRegion and FlatView refcounting, replace hostmem with memory_region_find, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 2/8] exec: check MRU in qemu_ram_addr_from_host, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 1/8] memory: add ref/unref calls, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 4/8] memory: ref/unref memory across address_space_map/unmap, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 3/8] memory: return MemoryRegion from qemu_ram_addr_from_host, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 5/8] memory: access FlatView from a local variable, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 6/8] memory: use a new FlatView pointer on every topology update,
Paolo Bonzini <=
- [Qemu-devel] [RFC PATCH 7/8] memory: add reference counting to FlatView, Paolo Bonzini, 2013/05/06
- [Qemu-devel] [RFC PATCH 8/8] dataplane: replace hostmem with memory_region_find, Paolo Bonzini, 2013/05/06
- Re: [Qemu-devel] [RFC PATCH 0/8] MemoryRegion and FlatView refcounting, replace hostmem with memory_region_find, liu ping fan, 2013/05/08
Re: [Qemu-devel] [RFC PATCH 0/8] MemoryRegion and FlatView refcounting, replace hostmem with memory_region_find, Stefan Hajnoczi, 2013/05/08
Re: [Qemu-devel] [RFC PATCH 0/8] MemoryRegion and FlatView refcounting, replace hostmem with memory_region_find, Stefan Hajnoczi, 2013/05/08