Calculate the number of dirty pages takes a lot on hosts with lots of memory. Just maintain how many pages are dirty. Only sync bitmaps if number is small enough.
Signed-off-by: Juan Quintela <quint...@redhat.com> --- arch_init.c | 15 +-------------- cpu-all.h | 1 + exec-obsolete.h | 8 ++++++++ exec.c | 2 ++ 4 files changed, 12 insertions(+), 14 deletions(-) diff --git a/arch_init.c b/arch_init.c index 2aa77ff..77c3580 100644 --- a/arch_init.c +++ b/arch_init.c @@ -224,20 +224,7 @@ 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) diff --git a/cpu-all.h b/cpu-all.h index 028528f..897210f 100644 --- a/cpu-all.h +++ b/cpu-all.h @@ -502,6 +502,7 @@ typedef struct RAMBlock { typedef struct RAMList { uint8_t *phys_dirty; QLIST_HEAD(, RAMBlock) blocks; + uint64_t dirty_pages; } RAMList; extern RAMList ram_list; diff --git a/exec-obsolete.h b/exec-obsolete.h index 792c831..2e54ac9 100644 --- a/exec-obsolete.h +++ b/exec-obsolete.h @@ -75,6 +75,10 @@ static inline int cpu_physical_memory_get_dirty(ram_addr_t start, static inline void cpu_physical_memory_set_dirty(ram_addr_t addr) { + if (!cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE, + MIGRATION_DIRTY_FLAG)) { + ram_list.dirty_pages++; + } ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] = 0xff; } @@ -112,6 +116,10 @@ static inline void cpu_physical_memory_mask_dirty_range(ram_addr_t start, mask = ~dirty_flags; p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS); for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) { + if (cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE, + MIGRATION_DIRTY_FLAG & dirty_flags)) { + ram_list.dirty_pages--; + } *p++ &= mask; } } diff --git a/exec.c b/exec.c index b6c7675..be4865c 100644 --- a/exec.c +++ b/exec.c @@ -2687,6 +2687,8 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS), 0xff, size >> TARGET_PAGE_BITS); + ram_list.dirty_pages += size >> TARGET_PAGE_BITS; + if (kvm_enabled()) kvm_setup_guest_memory(new_block->host, size); -- 1.7.7.6