proc-pid-mem

来源：互联网发布：cpu卡发卡软件编辑：程序博客网时间：2024/06/08 13:11

linxu下proc是个很重要的文件系统，很多和内核相关的信息都存在这里.

伦理片 http://www.dotdy.com/

maps

Txt代码  
40000000-40009000 r-xp 00000000 ca:01 12550177                 /opt/java/jdk-1.6.0_32/bin/java  
40108000-4010a000 rwxp 00008000 ca:01 12550177                 /opt/java/jdk-1.6.0_32/bin/java  
// 以上是进程的启动命令  
...  
  
// 这里开始是分配给这个线程堆区的物理地址开始位置，包含了每个加载的文件的起始地址  
40bbf000-40c24000 rwxp 00000000 00:00 0                        [heap]  
40c24000-40c27000 ---p 00000000 00:00 0  
...  
d0000000-100000000 rwxp 00000000 00:00 0  
3671800000-367181c000 r-xp 00000000 ca:01 2261321              /lib64/ld-2.5.so  
3671a1c000-3671a1d000 r-xp 0001c000 ca:01 2261321              /lib64/ld-2.5.so  
3671a1d000-3671a1e000 rwxp 0001d000 ca:01 2261321              /lib64/ld-2.5.so  
7f07c04ec000-7f07c1bb7000 rwxp 00000000 00:00 0  
7f07c1bb7000-7f07c1bbc000 r-xp 00000000 ca:01 12551958         /opt/java/jdk-1.6.0_32/jre/lib/amd64/headless/libmawt.so  
7f07c1bbc000-7f07c1cbb000 ---p 00005000 ca:01 12551958         /opt/java/jdk-1.6.0_32/jre/lib/amd64/headless/libmawt.so  
7f07c1cbb000-7f07c1cbd000 rwxp 00004000 ca:01 12551958         /opt/java/jdk-1.6.0_32/jre/lib/amd64/headless/libmawt.so  
7f07c1cbd000-7f07c1d4f000 r-xp 00000000 ca:01 12551964         /opt/java/jdk-1.6.0_32/jre/lib/amd64/libawt.so  
7f07c1d4f000-7f07c1e4e000 ---p 00092000 ca:01 12551964         /opt/java/jdk-1.6.0_32/jre/lib/amd64/libawt.so  
7f07c1e4e000-7f07c1e68000 rwxp 00091000 ca:01 12551964         /opt/java/jdk-1.6.0_32/jre/lib/amd64/libawt.so  
...  
7f07e0bb4000-7f07e0bbc000 rwxs 00000000 ca:01 16678915         /tmp/hsperfdata_admin/22892  
7f07e0bbc000-7f07e0bc3000 r-xs 00000000 ca:01 4981946          /usr/lib64/gconv/gconv-modules.cache  
7f07e0bc3000-7f07e0bc4000 rwxp 00000000 00:00 0  
7f07e0bc4000-7f07e0bc5000 r-xp 00000000 00:00 0  
7f07e0bc5000-7f07e0bc6000 r-xp 00000000 ca:01 5996807          /usr/local/snoopy/lib/snoopy.so  
7f07e0bc6000-7f07e0dc6000 ---p 00001000 ca:01 5996807          /usr/local/snoopy/lib/snoopy.so  
7f07e0dc6000-7f07e0dc7000 rwxp 00001000 ca:01 5996807          /usr/local/snoopy/lib/snoopy.so  
7f07e0dc7000-7f07e0dca000 rwxp 00000000 00:00 0  
7fff73ffc000-7fff74016000 rwxp 00000000 00:00 0                [stack]  // 用户态栈区  
7fff74098000-7fff74099000 r-xp 00000000 00:00 0                [vdso]  // Virtual Dynamically-linked Shared Object  
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0        [vsyscall]  // 内核区  

maps记录的是进程的简单信息，可以看堆区是不是在一直增长来判断是不是内存溢出。jvm的内存是虚拟内存，直接映射到os的物理内存中。有时候jvm中的虚拟内存是没什么问题，但是堆外内存一直在增长，这里是可以看出来的。详细内容见smaps

smaps

Txt代码  
40bbf000-40c24000 rwxp 00000000 00:00 0                [heap]  
Size:                404 kB    // 虚拟内存大小  
Rss:                 324 kB    // 实际使用物理内存大小  
Pss:                 324 kB  
Shared_Clean:          0 kB    // 页面被改，则是dirty,否则是clean,页面引用计数>1,是shared,否则是private  
Shared_Dirty:          0 kB  
Private_Clean:         0 kB  
Private_Dirty:       324 kB  
Referenced:          324 kB  
Anonymous:           324 kB  
AnonHugePages:         0 kB  
Swap:                  0 kB    // 处于交换区的页面大小  
KernelPageSize:        4 kB    // 操作系统一个页面大小  
MMUPageSize:           4 kB    // 体系结构MMU一个页面大小   

status

Txt代码  
Name:   java          // 启动命令  
State:  S (sleeping)  // 任务状态，运行/睡眠/僵死  
Tgid:   22892         // 线程组号  
Pid:    22892         // 进程id  
PPid:   22881         // 父进程id  
TracerPid:      0  
Uid:    505     505     505     505  
Gid:    505     505     505     505  
Utrace: 0  
FDSize: 1024  
Groups: 505  
VmPeak:  1757412 kB   // 内存使用峰值  
VmSize:  1756360 kB   // 进程虚拟地址空间大小  
VmLck:         0 kB   // 进程锁住的物理内存大小，锁住的物理内存无法交换到硬盘  
VmHWM:    817696 kB     
VmRSS:    817688 kB   // 进程正在使用的物理内存大小  
VmData:  1578852 kB   // 进程数据段大小  
VmStk:       108 kB   // 进程用户态栈大小  
VmExe:        36 kB   // 进程代码段大小  
VmLib:    100032 kB   // 进程使用的库映射到虚拟内存空间的大小  
VmPTE:      2176 kB   // 进程页表大小  
VmSwap:        0 kB   // 交换区  
Threads:        162  
SigQ:   0/31611  
SigPnd: 0000000000000000  
ShdPnd: 0000000000000000  
SigBlk: 0000000000000000  
SigIgn: 0000000000002223  
SigCgt: 1000000181005ccc  
CapInh: 0000000000000000  
CapPrm: 0000000000000000  
CapEff: 0000000000000000  
CapBnd: ffffffffffffffff  
Cpus_allowed:   7fff  
Cpus_allowed_list:      0-14  
Mems_allowed:   00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001  
Mems_allowed_list:      0  
voluntary_ctxt_switches:        1  
nonvoluntary_ctxt_switches:     6  

linux下内存占用是一个比较复杂的概念，不能简单通过一个单一指标就判断某个程序“内存消耗”大小：

进程所申请的内存不一定真正会被用到（malloc或mmap的实现）
真正用到了的内存也不一定是只有该进程自己在用 (比如动态共享库)

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