C++ (Cpp) copy_data_pages示例

示例#1

文件： swsusp.c 项目： Antonio-Zhou/Linux-2.6.11

static int suspend_prepare_image(void)
{
	int error;

	pr_debug("swsusp: critical section: \n");
	if (save_highmem()) {
		printk(KERN_CRIT "Suspend machine: Not enough free pages for highmem\n");
		restore_highmem();
		return -ENOMEM;
	}

	drain_local_pages();
	count_data_pages();
	printk("swsusp: Need to copy %u pages\n",nr_copy_pages);

	error = swsusp_alloc();
	if (error)
		return error;
	
	/* During allocating of suspend pagedir, new cold pages may appear. 
	 * Kill them.
	 */
	drain_local_pages();
	copy_data_pages();

	/*
	 * End of critical section. From now on, we can write to memory,
	 * but we should not touch disk. This specially means we must _not_
	 * touch swap space! Except we must write out our image of course.
	 */

	printk("swsusp: critical section/: done (%d pages copied)\n", nr_copy_pages );
	return 0;
}

示例#2

文件： snapshot.c 项目： Voskrese/mipsonqemu

asmlinkage int swsusp_save(void)
{
	unsigned int nr_pages;

	pr_debug("swsusp: critical section: \n");

	drain_local_pages();
	nr_pages = count_data_pages();
	printk("swsusp: Need to copy %u pages\n", nr_pages);

	if (!enough_free_mem(nr_pages)) {
		printk(KERN_ERR "swsusp: Not enough free memory\n");
		return -ENOMEM;
	}

	if (swsusp_alloc(&orig_bm, &copy_bm, nr_pages))
		return -ENOMEM;

	/* During allocating of suspend pagedir, new cold pages may appear.
	 * Kill them.
	 */
	drain_local_pages();
	copy_data_pages(&copy_bm, &orig_bm);

	/*
	 * End of critical section. From now on, we can write to memory,
	 * but we should not touch disk. This specially means we must _not_
	 * touch swap space! Except we must write out our image of course.
	 */

	nr_copy_pages = nr_pages;
	nr_meta_pages = (nr_pages * sizeof(long) + PAGE_SIZE - 1) >> PAGE_SHIFT;

	printk("swsusp: critical section/: done (%d pages copied)\n", nr_pages);
	return 0;
}