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🔧 缩减了为防止内存越界而预留的空间

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fslongjin
2022-02-28 16:38:13 +08:00
parent 36ad7a106e
commit 0801f25b8e
1 changed files with 4 additions and 4 deletions
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8
kernel/mm/slab.c
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@ -331,9 +331,9 @@ ul slab_init()
for (int i = 0; i < 16; ++i)
{
// 将slab内存池对象的空间放置在mms的后面，并且预留8个unsigned long 的空间以防止内存越界
// 将slab内存池对象的空间放置在mms的后面，并且预留4个unsigned long 的空间以防止内存越界
kmalloc_cache_group[i].cache_pool = (struct slab_obj *)memory_management_struct.end_of_struct;
memory_management_struct.end_of_struct += sizeof(struct slab_obj) + (sizeof(ul) << 3);
memory_management_struct.end_of_struct += sizeof(struct slab_obj) + (sizeof(ul) << 2);
list_init(&kmalloc_cache_group[i].cache_pool->list);
@ -346,8 +346,8 @@ ul slab_init()
// 在slab对象后方放置bmp
kmalloc_cache_group[i].cache_pool->bmp = (ul *)memory_management_struct.end_of_struct;
// bmp后方预留8个unsigned long的空间防止内存越界,且按照8byte进行对齐
memory_management_struct.end_of_struct = (ul)(memory_management_struct.end_of_struct + kmalloc_cache_group[i].cache_pool->bmp_len + (sizeof(ul) << 3)) & (~(sizeof(ul) - 1));
// bmp后方预留4个unsigned long的空间防止内存越界,且按照8byte进行对齐
memory_management_struct.end_of_struct = (ul)(memory_management_struct.end_of_struct + kmalloc_cache_group[i].cache_pool->bmp_len + (sizeof(ul) << 2)) & (~(sizeof(ul) - 1));
// @todo：此处可优化，直接把所有位设置为0，然后再对部分不存在对应的内存对象的位设置为1
memset(kmalloc_cache_group[i].cache_pool->bmp, 0xff, kmalloc_cache_group[i].cache_pool->bmp_len);