内存管理之bootmem管理之标记内存为reserve

最新推荐文章于 2025-11-02 12:32:08 发布

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本文介绍Linux内核中通过reserve_bootmem_node和reserve_bootmem函数预留内存范围的方法。这两种方法允许在启动过程中为特定组件保留内存，确保关键内存区域不被分配给其他用途。文章详细解释了如何指定要保留的内存范围及其所在节点。

主要提供reserve_bootmem_node和reserve_bootmem

/**
 * reserve_bootmem_node - mark a page range as reserved
 * @pgdat: node the range resides on
 * @physaddr: starting address of the range
 * @size: size of the range in bytes
 * @flags: reservation flags (see linux/bootmem.h)
 *
 * Partial pages will be reserved.
 *
 * The range must reside completely on the specified node.
 */
int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
				 unsigned long size, int flags)
{
	unsigned long start, end;


	start = PFN_DOWN(physaddr);
	end = PFN_UP(physaddr + size);


	return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
}



/**
 * reserve_bootmem - mark a page range as reserved
 * @addr: starting address of the range
 * @size: size of the range in bytes
 * @flags: reservation flags (see linux/bootmem.h)
 *
 * Partial pages will be reserved.
 *
 * The range must be contiguous but may span node boundaries.
 */
int __init reserve_bootmem(unsigned long addr, unsigned long size,
			    int flags)
{
	unsigned long start, end;


	start = PFN_DOWN(addr);
	end = PFN_UP(addr + size);


	return mark_bootmem(start, end, 1, flags);
}