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Maintain the number of dirty pages

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Calculate the number of dirty pages takes a lot on hosts with lots
of memory.  Just maintain how many pages are dirty.

Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2012-06-22 15:21:07 +02:00
parent 1720aeee72
commit 45f33f01f3
3 changed files with 12 additions and 14 deletions
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15
arch_init.c
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@ -238,20 +238,7 @@ static uint64_t bytes_transferred;
static ram_addr_t ram_save_remaining(void)
{
RAMBlock *block;
ram_addr_t count = 0;
QLIST_FOREACH(block, &ram_list.blocks, next) {
ram_addr_t addr;
for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
if (memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
count++;
}
}
}
return count;
return ram_list.dirty_pages;
}
uint64_t ram_bytes_remaining(void)

1
cpu-all.h
View File

@ -486,6 +486,7 @@ typedef struct RAMBlock {
typedef struct RAMList {
uint8_t *phys_dirty;
QLIST_HEAD(, RAMBlock) blocks;
uint64_t dirty_pages;
} RAMList;
extern RAMList ram_list;

10
exec-obsolete.h
View File

@ -74,6 +74,11 @@ static inline int cpu_physical_memory_get_dirty(ram_addr_t start,
static inline int cpu_physical_memory_set_dirty_flags(ram_addr_t addr,
int dirty_flags)
{
if ((dirty_flags & MIGRATION_DIRTY_FLAG) &&
!cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE,
MIGRATION_DIRTY_FLAG)) {
ram_list.dirty_pages++;
}
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flags;
}
@ -87,6 +92,11 @@ static inline int cpu_physical_memory_clear_dirty_flags(ram_addr_t addr,
{
int mask = ~dirty_flags;
if ((dirty_flags & MIGRATION_DIRTY_FLAG) &&
cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE,
MIGRATION_DIRTY_FLAG)) {
ram_list.dirty_pages--;
}
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] &= mask;
}