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memory: use find_next_bit() to find dirty bits 

This operation is way faster than doing it bit by bit.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
master
Juan Quintela 2013-10-09 12:15:06 +02:00
parent ace694cccc
commit 1bafff0c7c
1 changed files with 6 additions and 10 deletions
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16
include/exec/memory-internal.h
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@ -44,19 +44,15 @@ static inline bool cpu_physical_memory_get_dirty(ram_addr_t start,
ram_addr_t length,
unsigned client)
{
ram_addr_t addr, end;
unsigned long end, page, next;
assert(client < DIRTY_MEMORY_NUM);
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
if (test_bit(addr >> TARGET_PAGE_BITS,
ram_list.dirty_memory[client])) {
return true;
}
}
return false;
end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
page = start >> TARGET_PAGE_BITS;
next = find_next_bit(ram_list.dirty_memory[client], end, page);
return next < end;
}
static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,