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
posted @ 2013-12-19 12:00  Daniel King  阅读(571)  评论(0)  编辑  收藏  举报