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[Qemu-devel] [PATCH 8/8] memory: avoid ref/unref in memory_region_find
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 8/8] memory: avoid ref/unref in memory_region_find |
Date: |
Tue, 13 Jan 2015 18:52:17 +0100 |
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 a844ced..577e87c 100644
--- a/memory.c
+++ b/memory.c
@@ -1828,7 +1828,8 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
}
range = addrrange_make(int128_make64(addr), int128_make64(size));
- view = address_space_get_flatview(as);
+ rcu_read_lock();
+ view = atomic_rcu_read(&as->current_map);
fr = flatview_lookup(view, range);
if (!fr) {
flatview_unref(view);
@@ -1850,7 +1851,7 @@ MemoryRegionSection memory_region_find(MemoryRegion *mr,
ret.readonly = fr->readonly;
memory_region_ref(ret.mr);
- flatview_unref(view);
+ rcu_read_unlock();
return ret;
}
--
1.8.3.1
- Re: [Qemu-devel] [PATCH 1/8] tls: require compiler support for __thread, (continued)
- [Qemu-devel] [PATCH 2/8] rcu: add rcu library, Paolo Bonzini, 2015/01/13
- [Qemu-devel] [PATCH 6/8] memory: remove assertion on memory_region_destroy, Paolo Bonzini, 2015/01/13
- [Qemu-devel] [PATCH 5/8] rcu: add call_rcu, Paolo Bonzini, 2015/01/13
- [Qemu-devel] [PATCH 3/8] rcu: add rcutorture, Paolo Bonzini, 2015/01/13
- [Qemu-devel] [PATCH 7/8] memory: protect current_map by RCU, Paolo Bonzini, 2015/01/13
- [Qemu-devel] [PATCH 8/8] memory: avoid ref/unref in memory_region_find,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 4/8] rcu: allow nesting of rcu_read_lock/rcu_read_unlock, Paolo Bonzini, 2015/01/13
- Re: [Qemu-devel] [PATCH 0/8] RCUification of the memory API, part 1, Christian Borntraeger, 2015/01/16