88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software
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* according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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*
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
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* KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A
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* PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/netdevice.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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struct page_list {
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struct page_list* next;
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};
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static struct page_list* free_list;
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uint64_t count = 0;
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#define PG_ORDER 2
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int __init mem_frag_init(void)
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{
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struct page* pg;
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struct page_list* tmp;
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struct page_list *prev, *next;
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free_list = NULL;
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while (1) {
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pg = alloc_pages(GFP_KERNEL, PG_ORDER);
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if (pg == NULL)
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break;
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tmp = (struct page_list*)page_address(pg);
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tmp->next = free_list;
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free_list = tmp;
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count++;
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// printk(KERN_DEBUG "PFN:%lu\n", page_to_pfn(pg));
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}
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printk(KERN_DEBUG "%s: alloc count:%llu\n", __func__, count);
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if (free_list == NULL)
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return -ENOMEM;
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// free half of pages back to buddy.
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prev = free_list;
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while (prev && prev->next) {
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next = prev->next;
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prev->next = next->next;
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free_pages((uint64_t)next, PG_ORDER);
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prev = prev->next;
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count--;
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}
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printk(KERN_DEBUG "%s: Fin count:%llu\n", __func__, count);
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return 0;
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}
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void __exit mem_frag_exit(void)
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{
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struct page_list* tmp;
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while (free_list) {
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tmp = free_list;
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free_list = free_list->next;
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free_pages((uint64_t)tmp, PG_ORDER);
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count--;
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}
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printk(KERN_DEBUG "%s: exit. count:%llu\n", __func__, count);
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}
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module_init(mem_frag_init);
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module_exit(mem_frag_exit);
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MODULE_DESCRIPTION("make page fragment");
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MODULE_LICENSE("GPL");
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