进程内存分配和/proc/xxx/maps简单分析

参考：http://blog.163.com/tao198352__4232/blog/static/8502064520105611157897/

：http://blog.chinaunix.net/uid-9543173-id-3571436.html

下面是一个Linux进程的标准的内存段布局：

maps文件内容输出：

[root@NGFW src]# cat -n /proc/10800/maps
1 00400000-0040a000 r-xp 00000000 08:01 156019 /secgate/bin/ddns
2 00609000-0060a000 rw-p 00009000 08:01 156019 /secgate/bin/ddns
3 025e9000-0260a000 rw-p 00000000 00:00 0 [heap]
4 7f3958000000-7f3958021000 rw-p 00000000 00:00 0
5 7f3958021000-7f395c000000 ---p 00000000 00:00 0
6 7f395c000000-7f395c021000 rw-p 00000000 00:00 0
7 7f395c021000-7f3960000000 ---p 00000000 00:00 0
8 7f3960000000-7f3960021000 rw-p 00000000 00:00 0
9 7f3960021000-7f3964000000 ---p 00000000 00:00 0
10 7f39643b8000-7f39643b9000 ---p 00000000 00:00 0
11 7f39643b9000-7f3964db9000 rw-p 00000000 00:00 0
12 7f3964db9000-7f3964dba000 ---p 00000000 00:00 0
13 7f3964dba000-7f39657ba000 rw-p 00000000 00:00 0
14 7f39657ba000-7f39657d0000 r-xp 00000000 08:01 114924 /lib64/libresolv-2.12.so
15 7f39657d0000-7f39659d0000 ---p 00016000 08:01 114924 /lib64/libresolv-2.12.so
16 7f39659d0000-7f39659d1000 r--p 00016000 08:01 114924 /lib64/libresolv-2.12.so
17 7f39659d1000-7f39659d2000 rw-p 00017000 08:01 114924 /lib64/libresolv-2.12.so
18 7f39659d2000-7f39659d4000 rw-p 00000000 00:00 0
19 7f39659d4000-7f39659d9000 r-xp 00000000 08:01 114961 /lib64/libnss_dns-2.12.so
20 7f39659d9000-7f3965bd8000 ---p 00005000 08:01 114961 /lib64/libnss_dns-2.12.so
21 7f3965bd8000-7f3965bd9000 r--p 00004000 08:01 114961 /lib64/libnss_dns-2.12.so
22 7f3965bd9000-7f3965bda000 rw-p 00005000 08:01 114961 /lib64/libnss_dns-2.12.so
23 7f3965bda000-7f3965be6000 r-xp 00000000 08:01 114980 /lib64/libnss_files-2.12.so
24 7f3965be6000-7f3965de6000 ---p 0000c000 08:01 114980 /lib64/libnss_files-2.12.so
25 7f3965de6000-7f3965de7000 r--p 0000c000 08:01 114980 /lib64/libnss_files-2.12.so
26 7f3965de7000-7f3965de8000 rw-p 0000d000 08:01 114980 /lib64/libnss_files-2.12.so
27 7f3965df1000-7f3965df2000 ---p 00000000 00:00 0
28 7f3965df2000-7f39667f2000 rw-p 00000000 00:00 0
29 7f39667f2000-7f396c683000 r--p 00000000 08:01 1679546 /usr/lib/locale/locale-archive
30 7f396c683000-7f396da94000 rw-s 00000000 00:10 45305 /dev/shm/sg_dbg_ring
31 7f396da94000-7f396daaa000 r-xp 00000000 08:01 114911 /lib64/libgcc_s-4.4.6-20110824.so.1
32 7f396daaa000-7f396dca9000 ---p 00016000 08:01 114911 /lib64/libgcc_s-4.4.6-20110824.so.1
33 7f396dca9000-7f396dcaa000 rw-p 00015000 08:01 114911 /lib64/libgcc_s-4.4.6-20110824.so.1
34 7f396dcaa000-7f396dd92000 r-xp 00000000 08:01 1663052 /usr/lib64/libstdc++.so.6.0.13
35 7f396dd92000-7f396df92000 ---p 000e8000 08:01 1663052 /usr/lib64/libstdc++.so.6.0.13
36 7f396df92000-7f396df99000 r--p 000e8000 08:01 1663052 /usr/lib64/libstdc++.so.6.0.13
37 7f396df99000-7f396df9b000 rw-p 000ef000 08:01 1663052 /usr/lib64/libstdc++.so.6.0.13
38 7f396df9b000-7f396dfb0000 rw-p 00000000 00:00 0
39 7f396dfb0000-7f396dfb2000 r-xp 00000000 08:01 114857 /lib64/libdl-2.12.so
40 7f396dfb2000-7f396e1b2000 ---p 00002000 08:01 114857 /lib64/libdl-2.12.so
41 7f396e1b2000-7f396e1b3000 r--p 00002000 08:01 114857 /lib64/libdl-2.12.so
42 7f396e1b3000-7f396e1b4000 rw-p 00003000 08:01 114857 /lib64/libdl-2.12.so
43 7f396e1b4000-7f396e237000 r-xp 00000000 08:01 114704 /lib64/libm-2.12.so
44 7f396e237000-7f396e436000 ---p 00083000 08:01 114704 /lib64/libm-2.12.so
45 7f396e436000-7f396e437000 r--p 00082000 08:01 114704 /lib64/libm-2.12.so
46 7f396e437000-7f396e438000 rw-p 00083000 08:01 114704 /lib64/libm-2.12.so
47 7f396e438000-7f396e586000 r-xp 00000000 08:01 155978 /secgate/lib/libxml2.so
48 7f396e586000-7f396e785000 ---p 0014e000 08:01 155978 /secgate/lib/libxml2.so
49 7f396e785000-7f396e791000 rw-p 0014d000 08:01 155978 /secgate/lib/libxml2.so
50 7f396e791000-7f396e792000 rw-p 00000000 00:00 0
51 7f396e792000-7f396e7c4000 r-xp 00000000 08:01 155979 /secgate/lib/libsg_xmldom.so
52 7f396e7c4000-7f396e9c3000 ---p 00032000 08:01 155979 /secgate/lib/libsg_xmldom.so
53 7f396e9c3000-7f396e9d6000 rw-p 00031000 08:01 155979 /secgate/lib/libsg_xmldom.so
54 7f396e9d6000-7f396ea56000 rw-p 00000000 00:00 0
55 7f396ea56000-7f396efc8000 r-xp 00000000 08:01 156399 /secgate/lib/libhs-2.1.so
56 7f396efc8000-7f396f1c7000 ---p 00572000 08:01 156399 /secgate/lib/libhs-2.1.so
57 7f396f1c7000-7f396f1cc000 rw-p 00571000 08:01 156399 /secgate/lib/libhs-2.1.so
58 7f396f1cc000-7f396f1e1000 r-xp 00000000 08:01 114701 /lib64/libz.so.1.2.3
59 7f396f1e1000-7f396f3e0000 ---p 00015000 08:01 114701 /lib64/libz.so.1.2.3
60 7f396f3e0000-7f396f3e1000 r--p 00014000 08:01 114701 /lib64/libz.so.1.2.3
61 7f396f3e1000-7f396f3e2000 rw-p 00015000 08:01 114701 /lib64/libz.so.1.2.3
62 7f396f3e2000-7f396f46e000 r-xp 00000000 08:01 1663748 /usr/lib64/libsqlite3.so.0.8.6
63 7f396f46e000-7f396f66d000 ---p 0008c000 08:01 1663748 /usr/lib64/libsqlite3.so.0.8.6
64 7f396f66d000-7f396f670000 rw-p 0008b000 08:01 1663748 /usr/lib64/libsqlite3.so.0.8.6
65 7f396f670000-7f396f671000 rw-p 00000000 00:00 0
66 7f396f671000-7f396f679000 r-xp 00000000 08:01 155914 /secgate/lib/libnuma.so.1
67 7f396f679000-7f396f879000 ---p 00008000 08:01 155914 /secgate/lib/libnuma.so.1
68 7f396f879000-7f396f87a000 rw-p 00008000 08:01 155914 /secgate/lib/libnuma.so.1
69 7f396f87a000-7f396f881000 r-xp 00000000 08:01 114913 /lib64/librt-2.12.so
70 7f396f881000-7f396fa80000 ---p 00007000 08:01 114913 /lib64/librt-2.12.so
71 7f396fa80000-7f396fa81000 r--p 00006000 08:01 114913 /lib64/librt-2.12.so
72 7f396fa81000-7f396fa82000 rw-p 00007000 08:01 114913 /lib64/librt-2.12.so
73 7f396fa82000-7f396fc74000 r-xp 00000000 08:01 155932 /secgate/lib/libsg_crypto.so.1.0.0
74 7f396fc74000-7f396fe73000 ---p 001f2000 08:01 155932 /secgate/lib/libsg_crypto.so.1.0.0
75 7f396fe73000-7f396fe99000 rw-p 001f1000 08:01 155932 /secgate/lib/libsg_crypto.so.1.0.0
76 7f396fe99000-7f396fe9d000 rw-p 00000000 00:00 0
77 7f396fe9d000-7f3970034000 r-xp 00000000 08:01 114900 /lib64/libc-2.12.so
78 7f3970034000-7f3970234000 ---p 00197000 08:01 114900 /lib64/libc-2.12.so
79 7f3970234000-7f3970238000 r--p 00197000 08:01 114900 /lib64/libc-2.12.so
80 7f3970238000-7f3970239000 rw-p 0019b000 08:01 114900 /lib64/libc-2.12.so
81 7f3970239000-7f397023e000 rw-p 00000000 00:00 0
82 7f397023e000-7f3970255000 r-xp 00000000 08:01 114959 /lib64/libpthread-2.12.so
83 7f3970255000-7f3970454000 ---p 00017000 08:01 114959 /lib64/libpthread-2.12.so
84 7f3970454000-7f3970455000 r--p 00016000 08:01 114959 /lib64/libpthread-2.12.so
85 7f3970455000-7f3970456000 rw-p 00017000 08:01 114959 /lib64/libpthread-2.12.so
86 7f3970456000-7f397045a000 rw-p 00000000 00:00 0
87 7f397045a000-7f3970493000 r-xp 00000000 08:01 155990 /secgate/lib/libevent.so
88 7f3970493000-7f3970693000 ---p 00039000 08:01 155990 /secgate/lib/libevent.so
89 7f3970693000-7f3970695000 rw-p 00039000 08:01 155990 /secgate/lib/libevent.so
90 7f3970695000-7f397071c000 r-xp 00000000 08:01 156006 /secgate/lib/libsg_sc.so
91 7f397071c000-7f397091c000 ---p 00087000 08:01 156006 /secgate/lib/libsg_sc.so
92 7f397091c000-7f3970932000 rw-p 00087000 08:01 156006 /secgate/lib/libsg_sc.so
93 7f3970932000-7f3970a02000 rw-p 00000000 00:00 0
94 7f3970a02000-7f3970a3c000 r-xp 00000000 08:01 155997 /secgate/lib/libsg_fm.so
95 7f3970a3c000-7f3970c3b000 ---p 0003a000 08:01 155997 /secgate/lib/libsg_fm.so
96 7f3970c3b000-7f3970c44000 rw-p 00039000 08:01 155997 /secgate/lib/libsg_fm.so
97 7f3970c44000-7f3970c4a000 rw-p 00000000 00:00 0
98 7f3970c4a000-7f3970c6a000 r-xp 00000000 08:01 114952 /lib64/ld-2.12.so
99 7f3970e05000-7f3970e0c000 r--s 00000000 08:01 1671450 /usr/lib64/gconv/gconv-modules.cache
100 7f3970e0c000-7f3970e3c000 r--p 00000000 08:01 222345 /secgate/etc/conf/locale/zh_CN/LC_MESSAGES/zh_msg.mo
101 7f3970e3c000-7f3970e48000 rw-s 00000000 00:10 45292 /dev/shm/sg_log_state
102 7f3970e48000-7f3970e52000 rw-s 00000000 00:10 45304 /dev/shm/sg_dbg_state
103 7f3970e52000-7f3970e5f000 rw-p 00000000 00:00 0
104 7f3970e67000-7f3970e69000 rw-p 00000000 00:00 0
105 7f3970e69000-7f3970e6a000 r--p 0001f000 08:01 114952 /lib64/ld-2.12.so
106 7f3970e6a000-7f3970e6b000 rw-p 00020000 08:01 114952 /lib64/ld-2.12.so
107 7f3970e6b000-7f3970e6c000 rw-p 00000000 00:00 0
108 7f3971000000-7f3971c00000 rw-s 00000000 00:12 45294 /mnt/huge/log-log_ring_0
109 7fff3e721000-7fff3e736000 rw-p 00000000 00:00 0 [stack]
110 7fff3e7ff000-7fff3e800000 r-xp 00000000 00:00 0 [vdso]
111 ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]

分析：
1 00400000-0040a000 r-xp 00000000 08:01 156019 /secgate/bin/ddns 代码段
2 00609000-0060a000 rw-p 00009000 08:01 156019 /secgate/bin/ddns 数据段
3 025e9000-0260a000 rw-p 00000000 00:00 0 [heap] 堆
4 7f3958000000-7f3958021000 rw-p 00000000 00:00 0 各个线程的栈区
......
13 7f3964dba000-7f39657ba000 rw-p 00000000 00:00 0
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