自己写Linux module来收集buddy info

1 编写代码pslist.c

   1: #include<linux/init.h>

   2: #include<linux/module.h>

   3: #include<linux/list.h>

   4: #include<linux/sched.h>

   5: #include<linux/proc_fs.h>

   6: #include<linux/mm_types.h>

   7: #include<linux/fs.h>

   8: #include<linux/path.h>

   9: #include<linux/dcache.h>

  10: #include<linux/mm.h>

  11: #include<linux/mmzone.h>

  12: #include<linux/vmalloc.h>

  13:  

  14: MODULE_LICENSE("GPL");

  15:  

  16: int analyzeUMANode()

  17: {

  18:     int i,j;

  19:     unsigned long node_present_pages;

  20:     unsigned long node_spanned_pages;

  21:     struct pglist_data* node_0;

  22:     

  23:     struct zone* pzone;

  24:     unsigned long start_pfn;

  25:     unsigned long present_pages;

  26:     unsigned long spanned_pages;

  27:     struct free_area* pfreearea;

  28:     

  29:     printk("###################################################################\n");

  30:  

  31:     node_0 = NODE_DATA(0);

  32:     printk("node_0 at 0x%08x\n", node_0);

  33:     if (node_0 == NULL)

  34:         return 0;

  35:         

  36:     node_present_pages = node_0->node_present_pages;

  37:     node_spanned_pages = node_0->node_spanned_pages;

  38:     printk("present pages: %d\n", node_present_pages);

  39:     printk("spanned pages: %d\n", node_spanned_pages);

  40:     

  41:     for (i = 0; i < MAX_NR_ZONES; ++i)

  42:     {

  43:         pzone = &node_0->node_zones[i];

  44:         if (pzone == NULL)

  45:             continue;

  46:         printk("Zone %d Name: %s\n", i, pzone->name);

  47:         start_pfn = pzone->zone_start_pfn;

  48:         printk("start_pfn : %d\n", start_pfn);

  49:         present_pages = pzone->present_pages;

  50:         printk("present_pages : %d\n", present_pages);

  51:         spanned_pages = pzone->spanned_pages;

  52:         printk("spanned_pages : %d\n", spanned_pages);

  53:         printk("%8d MB - %8d MB\n", start_pfn * PAGE_SIZE / 1024 / 1024, (start_pfn + spanned_pages) * PAGE_SIZE / 1024 / 1024);

  54:         pfreearea = &pzone->free_area;

  55:         if (pfreearea == NULL)

  56:             continue;

  57:         for (j = 0; j < MAX_ORDER; ++j)

  58:         {

  59:             printk("%5d", (pfreearea + j)->nr_free);    

  60:         }

  61:         printk("\n");

  62:     }    

  63:     return 0;

  64: }

  65:  

  66: static int pslist_init()

  67: {

  68:     analyzeUMANode();

  69:         

  70: }

  71:  

  72: static void pslist_exit()

  73: {

  74:     printk("###################################################################\n");

  75: }

  76:  

  77: module_init(pslist_init);

  78: module_exit(pslist_exit);

2 编写Makefile

   1: obj-m += pslist.o

   2: #generate the path

   3: CURRENT_PATH:=$(shell pwd)

   4: #the current kernel version number

   5: LINUX_KERNEL:=$(shell uname -r)

   6: #the absolute path

   7: LINUX_KERNEL_PATH:=/usr/src/linux-headers-$(LINUX_KERNEL)

   8: #complie object

   9: all:

  10:     make -C $(LINUX_KERNEL_PATH) M=$(CURRENT_PATH) modules

  11: #clean

  12: clean:

  13:     make -C $(LINUX_KERNEL_PATH) M=$(CURRENT_PATH) clean

3 编译

   1: sudo make clean

   2: sudo make

4 加载模块，卸载模块

   1: sudo insmod pslist.ko

   2: sudo rmmod pslist

5 收集打印出来的信息

   1: dmesg | tail -100

示例如下：

   1: [ 4011.124611] ###################################################################

   2: [ 4011.124614] node_0 at 0xc17b11c0

   3: [ 4011.124615] present pages: 262015

   4: [ 4011.124616] spanned pages: 262112

   5: [ 4011.124617] Zone 0 Name: DMA

   6: [ 4011.124618] start_pfn : 16

   7: [ 4011.124619] present_pages : 3951

   8: [ 4011.124619] spanned_pages : 4080

   9: [ 4011.124620]        0 MB -       16 MB

  10: [ 4011.124621]     2    2    1    2    3    2    2    1    2    2    2

  11: [ 4011.124624] Zone 1 Name: Normal

  12: [ 4011.124625] start_pfn : 4096

  13: [ 4011.124626] present_pages : 221486

  14: [ 4011.124626] spanned_pages : 223230

  15: [ 4011.124627]       16 MB -      887 MB

  16: [ 4011.124628]   161   65  150  197   48   54   34   12    7    2   55

  17: [ 4011.124631] Zone 2 Name: HighMem

  18: [ 4011.124632] start_pfn : 227326

  19: [ 4011.124632] present_pages : 34530

  20: [ 4011.124633] spanned_pages : 34802

  21: [ 4011.124634]      887 MB -     1023 MB

  22: [ 4011.124635]    76   98   31    6    1    0    0    0    0    0    0

  23: [ 4011.124637] Zone 3 Name: Movable

  24: [ 4011.124638] start_pfn : 0

  25: [ 4011.124638] present_pages : 0

  26: [ 4011.124639] spanned_pages : 0

  27: [ 4011.124640]        0 MB -        0 MB

  28: [ 4011.124641]     0    0    0    0    0    0    0    0    0    0    0

  29: [ 4095.143430] ###################################################################

6 与proc文件系统打印出来的信息做对比

   1: $ cat /proc/buddyinfo

   2: Node 0, zone      DMA      2      2      1      2      3      2      2      1      2      2      2 

   3: Node 0, zone   Normal    371    196    176    229     81     57     39     12      3      3     53 

   4: Node 0, zone  HighMem     76     98     31      6      1      0      0      0      0      0      0