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memory: reorder MemoryRegion fields 

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

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-12-09 11:40:14 +01:00
parent e81bcda529
commit a676854f34
1 changed files with 14 additions and 10 deletions
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24
include/exec/memory.h
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@ -159,27 +159,32 @@ typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
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 flush_coalesced_mmio;
bool global_locking;
uint8_t vga_logging_count;
MemoryRegion *alias;
hwaddr alias_offset;
@ -189,7 +194,6 @@ struct MemoryRegion {
QTAILQ_ENTRY(MemoryRegion) subregions_link;
QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced;
const char *name;
uint8_t dirty_log_mask;
unsigned ioeventfd_nb;
MemoryRegionIoeventfd *ioeventfds;
NotifierList iommu_notify;