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memory: reorder MemoryRegion fields

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Order fields so that all fields accessed during a RAM read/write fit in
the same cache line.

Backports commit a676854f3447019c7c4b005ab6aece905fccfddd from qemu
This commit is contained in:
Paolo Bonzini 2018-02-17 19:48:44 -05:00 committed by Lioncash
parent 52b3120995
commit e6b25279f8
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 13 additions and 9 deletions
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22
qemu/include/exec/memory.h
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@ -149,26 +149,31 @@ struct MemoryRegionIOMMUOps {
struct MemoryRegion {
Object parent_obj;
/* All fields are private - violators will be prosecuted */
const MemoryRegionOps *ops;
/* The following fields should fit in a cache line */
bool romd_mode;
bool ram;
bool subpage;
bool readonly; /* For RAM regions */
bool rom_device;
bool flush_coalesced_mmio;
bool global_locking;
uint8_t dirty_log_mask;
ram_addr_t ram_addr;
const MemoryRegionIOMMUOps *iommu_ops;
const MemoryRegionOps *ops;
void *opaque;
MemoryRegion *container;
Int128 size;
hwaddr addr;
void (*destructor)(MemoryRegion *mr);
ram_addr_t ram_addr;
uint64_t align;
bool subpage;
bool terminates;
bool romd_mode;
bool ram;
bool skip_dump;
bool readonly; /* For RAM regions */
bool enabled;
bool rom_device;
bool warning_printed; /* For reservations */
bool global_locking;
MemoryRegion *alias;
hwaddr alias_offset;
int32_t priority;
@ -176,7 +181,6 @@ struct MemoryRegion {
QTAILQ_HEAD(subregions, MemoryRegion) subregions;
QTAILQ_ENTRY(MemoryRegion) subregions_link;
const char *name;
uint8_t dirty_log_mask;
struct uc_struct *uc;
uint32_t perms; //all perms, partially redundant with readonly
uint64_t end;