proc文件系统

• 在linux系统中，proc文件系统用于导出内核的信息
• proc文件系统一般是只读，也是可以通过编写代码给proc中添加信息，感兴趣可以在网上找一找代码来实现，用处不大。
• 类比window系统的任务管理器
• 学习方法参考"linux命令"，知道有这个功能，用到的时候再去查即可

meminfo

cat /proc/meminfo

返回结果：

MemTotal:         613560 kB
MemFree:          586892 kB
Buffers:            2948 kB
Cached:             4416 kB
SwapCached:            0 kB
Active:             2220 kB
Inactive:           5460 kB
Active(anon):        320 kB
Inactive(anon):        0 kB
Active(file):       1900 kB
Inactive(file):     5460 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:        261120 kB
HighFree:         256056 kB
LowTotal:         352440 kB
LowFree:          330836 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                12 kB
Writeback:             0 kB
AnonPages:           360 kB

• 常用参数
  • MemTotal：从内存
  • MemFree：空闲内存
  • Cached：缓存
  • Active：活跃内存
  • Inactive：非活跃内存

cpuinfo

cat /proc/cpuinfo

返回结果：

[root@iTOP-4412]# cat /proc/cpuinfo                                                                        
cpu id          : 0xe4412011

Processor       : ARMv7 Processor rev 0 (v7l)
processor       : 0
BogoMIPS        : 1992.29

Features        : swp half thumb fastmult vfp edsp neon vfpv3 tls 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x3
CPU part        : 0xc09
CPU revision    : 0

Hardware        : SMDK4X12
Revision        : 0000
Serial          : 0000000000000000

• 常用参数：
  • cpu id：cpu代号
  • Processor：处理器

interrupts

cat /proc/interrupts

测试结果；

[root@iTOP-4412]# cat /proc/interrupts                                                                     
           CPU0       
 24:        330  s3c-uart  s5pv210-uart
 26:        815  s3c-uart  s5pv210-uart
 98:          0       GIC  s3c-pl330.0
 99:          0       GIC  s3c-pl330.1
100:          0       GIC  s3c-pl330.2
107:          0       GIC  s3c2410-wdt
108:          0       GIC  s3c2410-rtc alarm
121:          9       GIC  mct_comp_irq
123:      31686       GIC  s3c2440-i2c.1
125:          1       GIC  s3c2440-i2c.3
126:         60       GIC  s3c2440-i2c.4
127:          0       GIC  s3c2440-i2c.5
129:          6       GIC  s3c2440-i2c.7
134:      58467       GIC  ehci_hcd:usb1
135:         55       GIC  s3c-udc
139:          0       GIC  mmc1
140:          0       GIC  mmc2
141:       4221       GIC  mmc0
142:          0       GIC  s3c-csis0
144:          0       GIC  s3c-csis1
148:          0       GIC  s3c-fimc0
149:          0       GIC  s3c-fimc1
150:          0       GIC  s3c-fimc2
151:          0       GIC  s3c-fimc3
152:          0       GIC  s5p-jpeg
153:          0       GIC  s5p-fimg2d
155:          0       GIC  s5p-mixer
156:          0       GIC  s5p-hdmi
158:          0       GIC  s3c-mfc
160:          0       GIC  samsung-rp
173:          0       GIC  samsung-keypad
182:          0       GIC  mali_mmu_irq_handlers
183:          0       GIC  mali_mmu_irq_handlers
184:          0       GIC  mali_mmu_irq_handlers
185:          0       GIC  mali_mmu_irq_handlers
186:          0       GIC  mali_mmu_irq_handlers
187:          0       GIC  mali_core_irq_handlers
188:          0       GIC  mali_core_irq_handlers
189:          0       GIC  mali_core_irq_handlers
190:          0       GIC  mali_core_irq_handlers
191:          0       GIC  mali_core_irq_handlers
226:          0  COMBINER  s5p-sysmmu.1
227:          0  COMBINER  s5p-sysmmu.2
228:          0  COMBINER  s5p-sysmmu.3
229:          0  COMBINER  s5p-sysmmu.4
230:          0  COMBINER  s5p-sysmmu.5
231:          0  COMBINER  s5p-sysmmu.15
236:          0  COMBINER  s5p-sysmmu.12
237:          0  COMBINER  s5p-sysmmu.14
238:          0  COMBINER  s5p-sysmmu.13
281:          0  COMBINER  s3cfb
352:          1  exynos-eint
359:          0  exynos-eint  s3c-sdhci.2
361:          0  exynos-eint  BUTTON1
362:          0  exynos-eint  BUTTON2
367:          1  exynos-eint  s5m87xx-irq
368:          0  exynos-eint  BUTTON4
369:          0  exynos-eint  BUTTON5
370:          0  exynos-eint  switch-gpio
379:          0  exynos-eint  BUTTON3
383:          1  exynos-eint  hpd
428:          0   s5m8767  rtc-alarm0
IPI0:          0          0          0          0  Timer broadcast interrupts
IPI1:       1028       1134        601        367  Rescheduling interrupts
IPI2:          2          6          7          4  Function call interrupts
IPI3:          0          1          0          0  Single function call interrupts
IPI4:          0          0          0          0  CPU stop interrupts
IPI5:          0          0          0          0  CPU backtrace
LOC:      86291        467       1287        804  Local timer interrupts
Err:          0

• 常用参数：里面是一些中断相关函数
• 注册的中断都会在这里显示

• 其他文件
  • 提供给大家一个文档"proc参数介绍"，有时间可以看一看
  • 实际过程中，用到的时候可以通过网络查找