motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 15:23:53 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

memory: protect current_map by RCU

Browse source 
Replace the flat_view_mutex with RCU, avoiding futex contention for
dataplane on large systems and many iothreads.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-05-17 12:37:03 +02:00
parent b476c99d01
commit 374f2981d1
2 changed files with 28 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

5
include/exec/memory.h
View file

@ -33,6 +33,7 @@
#include "qemu/notify.h"
#include "qapi/error.h"
#include "qom/object.h"
#include "qemu/rcu.h"
#define MAX_PHYS_ADDR_SPACE_BITS 62
#define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
@ -207,9 +208,13 @@ struct MemoryListener {
*/
struct AddressSpace {
/* All fields are private. */
struct rcu_head rcu;
char *name;
MemoryRegion *root;
/* Accessed via RCU. */
struct FlatView *current_map;
int ioeventfd_nb;
struct MemoryRegionIoeventfd *ioeventfds;
struct AddressSpaceDispatch *dispatch;