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("################################################################### ");
30: 31: node_0 = NODE_DATA(0);32: printk("node_0 at 0x%08x ", 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 ", node_present_pages);
39: printk("spanned pages: %d ", 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 ", i, pzone->name);
47: start_pfn = pzone->zone_start_pfn;48: printk("start_pfn : %d ", start_pfn);
49: present_pages = pzone->present_pages;50: printk("present_pages : %d ", present_pages);
51: spanned_pages = pzone->spanned_pages;52: printk("spanned_pages : %d ", spanned_pages);
53: printk("%8d MB - %8d MB ", 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(" ");
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("################################################################### ");
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) clean3 编译
1: sudo make clean 2: sudo make4 加载模块，卸载模块
1: sudo insmod pslist.ko 2: sudo rmmod pslist5 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