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ram: split function that synchronizes a range 

This function is the only bit where we care about speed.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
This commit is contained in:
Juan Quintela 2013-11-05 16:47:20 +01:00
parent ae2810c4bb
commit 791fa2a245
1 changed files with 20 additions and 14 deletions
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34
arch_init.c
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@ -360,11 +360,10 @@ ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr,
return (next - base) << TARGET_PAGE_BITS;
}
static inline bool migration_bitmap_set_dirty(MemoryRegion *mr,
ram_addr_t offset)
static inline bool migration_bitmap_set_dirty(ram_addr_t addr)
{
bool ret;
int nr = (mr->ram_addr + offset) >> TARGET_PAGE_BITS;
int nr = addr >> TARGET_PAGE_BITS;
ret = test_and_set_bit(nr, migration_bitmap);
@ -374,12 +373,28 @@ static inline bool migration_bitmap_set_dirty(MemoryRegion *mr,
return ret;
}
static void migration_bitmap_sync_range(ram_addr_t start, ram_addr_t length)
{
ram_addr_t addr;
for (addr = 0; addr < length; addr += TARGET_PAGE_SIZE) {
if (cpu_physical_memory_get_dirty(start + addr,
TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
cpu_physical_memory_reset_dirty(start + addr,
TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION);
migration_bitmap_set_dirty(start + addr);
}
}
}
/* Needs iothread lock! */
static void migration_bitmap_sync(void)
{
RAMBlock *block;
ram_addr_t addr;
uint64_t num_dirty_pages_init = migration_dirty_pages;
MigrationState *s = migrate_get_current();
static int64_t start_time;
@ -400,16 +415,7 @@ static void migration_bitmap_sync(void)
address_space_sync_dirty_bitmap(&address_space_memory);
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
if (cpu_physical_memory_get_dirty(block->mr->ram_addr + addr,
TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
cpu_physical_memory_reset_dirty(block->mr->ram_addr + addr,
TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION);
migration_bitmap_set_dirty(block->mr, addr);
}
}
migration_bitmap_sync_range(block->mr->ram_addr, block->length);
}
trace_migration_bitmap_sync_end(migration_dirty_pages
- num_dirty_pages_init);