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[Qemu-devel] [PATCH 55/66] memory: access FlatView from a local variable
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 55/66] memory: access FlatView from a local variable |
Date: |
Thu, 4 Jul 2013 17:13:51 +0200 |
We will soon require accesses to as->current_map to be placed under
a lock (with reference counting so as to keep the critical section
small). To simplify this change, always fetch as->current_map into
a local variable and access it through that variable.
Reviewed-by: Anthony Liguori <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
memory.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
diff --git a/memory.c b/memory.c
index 543e0cc..4449462 100644
--- a/memory.c
+++ b/memory.c
@@ -578,13 +578,15 @@ static void address_space_add_del_ioeventfds(AddressSpace
*as,
static void address_space_update_ioeventfds(AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
unsigned ioeventfd_nb = 0;
MemoryRegionIoeventfd *ioeventfds = NULL;
AddrRange tmp;
unsigned i;
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = as->current_map;
+ FOR_EACH_FLAT_RANGE(fr, view) {
for (i = 0; i < fr->mr->ioeventfd_nb; ++i) {
tmp = addrrange_shift(fr->mr->ioeventfds[i].addr,
int128_sub(fr->addr.start,
@@ -1144,7 +1146,8 @@ void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
FlatRange *fr;
QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ FlatView *view = as->current_map;
+ FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
}
@@ -1194,12 +1197,14 @@ void *memory_region_get_ram_ptr(MemoryRegion *mr)
static void memory_region_update_coalesced_range_as(MemoryRegion *mr,
AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
CoalescedMemoryRange *cmr;
AddrRange tmp;
MemoryRegionSection section;
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = as->current_map;
+ FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
section = (MemoryRegionSection) {
.address_space = as,
@@ -1490,9 +1495,9 @@ static int cmp_flatrange_addr(const void *addr_, const
void *fr_)
return 0;
}
-static FlatRange *address_space_lookup(AddressSpace *as, AddrRange addr)
+static FlatRange *flatview_lookup(FlatView *view, AddrRange addr)
{
- return bsearch(&addr, as->current_map->ranges, as->current_map->nr,
+ return bsearch(&addr, view->ranges, view->nr,
sizeof(FlatRange), cmp_flatrange_addr);
}
@@ -1513,6 +1518,7 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
MemoryRegion *root;
AddressSpace *as;
AddrRange range;
+ FlatView *view;
FlatRange *fr;
addr += mr->addr;
@@ -1523,13 +1529,14 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
as = memory_region_to_address_space(root);
range = addrrange_make(int128_make64(addr), int128_make64(size));
- fr = address_space_lookup(as, range);
+
+ view = as->current_map;
+ fr = flatview_lookup(view, range);
if (!fr) {
return ret;
}
- while (fr > as->current_map->ranges
- && addrrange_intersects(fr[-1].addr, range)) {
+ while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) {
--fr;
}
@@ -1549,9 +1556,11 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
void address_space_sync_dirty_bitmap(AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = as->current_map;
+ FOR_EACH_FLAT_RANGE(fr, view) {
MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync);
}
}
@@ -1571,6 +1580,7 @@ void memory_global_dirty_log_stop(void)
static void listener_add_address_space(MemoryListener *listener,
AddressSpace *as)
{
+ FlatView *view;
FlatRange *fr;
if (listener->address_space_filter
@@ -1584,7 +1594,8 @@ static void listener_add_address_space(MemoryListener
*listener,
}
}
- FOR_EACH_FLAT_RANGE(fr, as->current_map) {
+ view = as->current_map;
+ FOR_EACH_FLAT_RANGE(fr, view) {
MemoryRegionSection section = {
.mr = fr->mr,
.address_space = as,
--
1.8.1.4
- [Qemu-devel] [PATCH 43/66] hw/block: pass owner to memory_region_init* functions, (continued)
- [Qemu-devel] [PATCH 43/66] hw/block: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 44/66] hw/c*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 42/66] hw/a*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 45/66] hw/d*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 46/66] hw/gpio: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 47/66] hw/i*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 48/66] hw/m*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 49/66] hw/n*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 51/66] hw/s*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 50/66] hw/p*: pass owner to memory_region_init* functions, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 55/66] memory: access FlatView from a local variable,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 56/66] memory: use a new FlatView pointer on every topology update, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 54/66] add a header file for atomic operations, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 57/66] memory: add reference counting to FlatView, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 58/66] qom: Use atomics for object refcounting, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 59/66] exec: change well-known physical sections to macros, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 60/66] exec: separate current memory map from the one being built, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 61/66] memory: move MemoryListener declaration earlier, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 63/66] exec: separate current radix tree from the one being built, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 62/66] exec: move listener from AddressSpaceDispatch to AddressSpace, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 64/66] exec: put memory map in AddressSpaceDispatch, Paolo Bonzini, 2013/07/04