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openEuler-competition / Summer2021-No.40 统计一个内核模块占用的内存

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MulanPSL-2.0

Summer2021-No.40 统计一个内核模块占用的内存

介绍

https://gitee.com/openeuler-competition/summer-2021/issues/I3EFZU

文件说明

old-patch文件夹内存放中期考核成果0001-statis.patch,以及9月15日初步完成的patch。

0001-add-usedmemory-to-sysfs.patch:完成sys目录下每个模块usedmemory的创建,在struct module及module_kobject当中添加了相应的数据结构。

0002-slab.patch:完成slab统计的功能,因为需要添加相应的统计函数及记录结构体,新增加了两个文件statis_memory.c以及statis_memory.h。

0003-buddy.patch:完成buddy系统的统计功能。

0004-percpu.patch:完成percpu系统的统计功能。

0005-add-split_page-krealloc.patch:增加slab和buddy系统当中的几个额外函数。

0006-mempool.patch:完成mempool的统计功能。

0007-update.patch:原先的输出中会带有Records以及Record page信息,这是供调试用的,现已删除

0008-add-dmapool.patch:新增了dmapool的统计功能

使用

使用内核模块内存统计功能需要开启mm/Kconfig下的Kmalloc debug的配置选项

image-20210930191802163

开启后会在sysfs下为每个模块(非built-in模块)创建一个usedmemory文件

image-20210930192645147

usedmemory文件会记录该模块使用的内存情况

image-20210930193807280

slab记录从slab中分配的内存,Pages记录从buddy中分配的页,Percpu记录percpu内存,dmapool记录从dmapool中分配的内存。

测试验证结果

为了测试统计函数的准确性,使用一个模块print_module来分别测试slab、buddy、percpu、mempool相关函数的内存分配与释放情况。

kmalloc系列函数测试

slab:1472 = 256 + 192 + 512 + 512

pages:4页来自于__kmalloc

image-20210930202847242

free后均为0

image-20210930203128252

krealloc函数测试

使用krealloc重新分配8193字节,超过slab的限制,从buddy中分配4页

image-20210930203316535

free后为0

image-20210930203910417

kmalloc_node系列函数测试

1312 = 32 + 32 + 96 + 1024 + 128

image-20210930204154433

free后为0

image-20210930204429387

kmem_cache系列函数测试

mytest_struct结构体为28字节,创建kmem_cache时会分配32个字节

分配两次一共是64 字节

struct mytest_struct{
    char a[26];
    char c;
    char z;
};

image-20210930204613040

free后为0

image-20210930204910521

kmem_cache_node系列函数测试

分配一次为32字节

image-20210930205025040

free后为0

image-20210930205104101

kmem_cache_alloc_bulk函数测试

kmem_cache_alloc_bulk可以进行批量内存分配,测试分配20个的情况,共统计了640字节

image-20210930205214039

free后为0

image-20210930205353417

buddy页分配测试

alloc_pages分配16页

alloc_pages_node分配8页

get_zeroed_page分配1页

__get_free_pages分配4页

alloc_pages_exact分配3页

共计:32页

image-20210930210138261

free后为0

image-20210930210204059

percpu分配测试

image-20210930210312715

free后为0

image-20210930210346363

mempool分配测试

使用mempool分别创建一个slab_pool、一个page_pool以及两个kmalloc_pool

slab_pool分配32字节

page_pool分配8页

第一个kmalloc_pool分配32字节

第二个kmalloc_pool分配4字节

共计:64字节12页

image-20210930212117050

free后均为0

image-20210930212400193

参与贡献

  1. Fork 本仓库

  2. 新建 Feat_xxx 分支

  3. 提交代码

  4. 新建 Pull Request

  5. https://gitee.com/gitee-stars/)

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