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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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10
exec-obsolete.h
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@ -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;
}