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[Qemu-devel] [PATCH 19/30] memory: avoid ref/unref in memory_region_find
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 19/30] memory: avoid ref/unref in memory_region_find |
Date: |
Fri, 28 Jun 2013 20:26:38 +0200 |
Do the entire lookup under RCU.
Signed-off-by: Paolo Bonzini <address@hidden>
---
memory.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/memory.c b/memory.c
index 7a4fe37..4fc23a2 100644
--- a/memory.c
+++ b/memory.c
@@ -1559,7 +1559,8 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
as = memory_region_to_address_space(root);
range = addrrange_make(int128_make64(addr), int128_make64(size));
- view = address_space_get_flatview(as);
+ rcu_read_lock();
+ view = rcu_dereference(&as->current_map);
fr = flatview_lookup(view, range);
if (!fr) {
return ret;
@@ -1580,7 +1581,7 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
ret.readonly = fr->readonly;
memory_region_ref(ret.mr);
- flatview_unref(view);
+ rcu_read_unlock();
return ret;
}
--
1.8.1.4
- [Qemu-devel] [PATCH 09/30] qemu-thread: register threads with RCU, (continued)
- [Qemu-devel] [PATCH 09/30] qemu-thread: register threads with RCU, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 12/30] rcu: allow nested calls to rcu_thread_offline/rcu_thread_online, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 11/30] rcu: add rcutorture, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 13/30] qemu-thread: report RCU quiescent states, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 08/30] rcu: add rcu library, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 14/30] event loop: report RCU quiescent states, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 10/30] rcu: add call_rcu, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 15/30] cpus: report RCU quiescent states, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 16/30] block: report RCU quiescent states, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 17/30] migration: report RCU quiescent states, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 19/30] memory: avoid ref/unref in memory_region_find,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 18/30] memory: protect current_map by RCU, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 20/30] exec: change well-known physical sections to macros, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 21/30] exec: separate current memory map from the one being built, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 22/30] memory: move MemoryListener declaration earlier, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 23/30] exec: move listener from AddressSpaceDispatch to AddressSpace, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 24/30] exec: separate current radix tree from the one being built, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 26/30] exec: remove cur_map, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 25/30] exec: put memory map in AddressSpaceDispatch, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 27/30] exec: change some APIs to take AddressSpaceDispatch, Paolo Bonzini, 2013/06/28
- [Qemu-devel] [PATCH 28/30] exec: change iotlb APIs to take AddressSpaceDispatch, Paolo Bonzini, 2013/06/28