system.py 文件源码

def extend_swap(size):
        if size < 0:
            (mem_free, mem_total) = system_manager.get_memory_sample()
            size = (mem_total + mem_total // 8) // 1024
        nid = 128
        while subprocess.getoutput("cat /proc/swaps | grep cg-loop | awk '{print $1}' | awk -F\- '{print $NF}' | grep %d$" % nid) != "":
            nid = nid + 1
        start_time = time.time()
        # setup
        os.system('dd if=/dev/zero of=/tmp/cg-swap-%d bs=1G count=0 seek=%d >/dev/null 2>&1' % (nid, size))
        os.system('mknod -m 0660 /dev/cg-loop-%d b 7 %d >/dev/null 2>&1' % (nid, nid))
        os.system('losetup /dev/cg-loop-%d /tmp/cg-swap-%d >/dev/null 2>&1' % (nid, nid))
        os.system('mkswap /dev/cg-loop-%d >/dev/null 2>&1' % nid)
        success = os.system('swapon /dev/cg-loop-%d >/dev/null 2>&1' % nid) == 0
        # detach
        # os.system('swapoff /dev/cg-loop-%d >/dev/null 2>&1' % nid)
        # os.system('losetup -d /dev/cg-loop-%d >/dev/null 2>&1' % nid)
        # os.system('rm -f /dev/cg-loop-%d /tmp/cg-swap-%d >/dev/null 2>&1' % (nid, nid))
        end_time = time.time()
        return {"setup": success, "time": end_time - start_time }