在Linux框中，我们启动一个Java应用程序并使用宏与GUI进行交互。 1小时后，所有缓存的内存已满，无法释放！ oom Killer激活并杀死Java应用程序。
$uname -a
Linux glp-56-summe 3.18.21-rt19 #27 SMP PREEMPT RT Wed Aug 10 16:22:37 CEST 2016 i686 GNU/Linux
$cat /etc/debian_version
8.3
1小时后：
$ free -m;echo 3>/proc/sys/vm/drop_caches;free -m
total used free shared buffers cached
Mem: 742 734 8 294 67 385
-/+ buffers/cache: 280 461
Swap: 0 0 0
total used free shared buffers cached
Mem: 742 734 8 294 67 385
-/+ buffers/cache: 280 461
Swap: 0 0 0
不可能释放缓存的内存！
$ top
top - 18:23:46 up 1 day, 3:50, 1 user, load average: 4.40, 4.04, 3.75
Tasks: 119 total, 2 running, 117 sleeping, 0 stopped, 0 zombie
%Cpu(s): 52.0 us, 34.2 sy, 1.6 ni, 0.0 id, 3.6 wa, 3.6 hi, 4.9 si, 0.0 st
KiB Mem: 760016 total, 751904 used, 8112 free, 70856 buffers
KiB Swap: 0 total, 0 used, 0 free. 393176 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1497 user1 20 0 340064 187740 31588 S 58.6 24.7 31:45.31 java
1998 root 21 1 30488 144 0 S 10.1 0.0 16:30.54 tracelogd
2095 root 19 -1 282328 19588 11704 S 6.2 2.6 15:36.66 Xorg
2295 root 20 0 761900 29460 0 S 5.6 3.9 79:17.51 glp3_linux_utf8
1755 user1 20 0 35180 10844 9324 S 1.3 1.4 0:23.77 scim-panel-gtk
1747 user1 20 0 15108 10224 3136 S 1.0 1.3 0:20.87 scim-launcher
3 root -2 0 0 0 0 S 0.7 0.0 8:09.52 ksoftirqd/0
$ df –h
Filesystem Size Used Avail Use% Mounted on
/dev/root 3.6G 1.8G 1.7G 52% /
devtmpfs 371M 0 371M 0% /dev
tmpfs 75M 664K 74M 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 149M 36K 149M 1% /run/shm
也没有使用缓存的tmpfs
$ ls -all /dev/shm/
total 36
drwxrwxrwt 2 root root 160 Jul 31 15:23 .
drwxr-xr-x 13 root root 600 Jul 30 14:33 ..
-rw-r--r-- 1 root root 0 Jul 30 14:32 .tmpfs
-rwxrwxrwx 1 root bizgroup 79400 Jul 30 14:33 BMQforGXNET_SHM
-rwxrwxrwx 1 root bizgroup 16 Jul 30 14:33 sem.BMQforGXNET
-rw-r--r-- 1 root root 16 Jul 31 15:23 sem.SemQuEdvSnd
-rw-r--r-- 1 root root 16 Jul 31 15:23 sem.SemQuRcv
-rw-r--r-- 1 root bizgroup 16 Jul 30 14:33 sem.glp3_linux_utf8.wdogsema
$ cat /proc/meminfo
cat /proc/meminfo
MemTotal: 760016 kB
MemFree: 8724 kB
MemAvailable: 172644 kB
Buffers: 70024 kB
Cached: 393636 kB
SwapCached: 0 kB
Active: 318060 kB
Inactive: 379372 kB
Active(anon): 235340 kB
Inactive(anon): 297964 kB
Active(file): 82720 kB
Inactive(file): 81408 kB
Unevictable: 8 kB
Mlocked: 0 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 760016 kB
LowFree: 8724 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 1516 kB
Writeback: 0 kB
AnonPages: 233808 kB
Mapped: 58348 kB
Shmem: 299520 kB
Slab: 23212 kB
SReclaimable: 13220 kB
SUnreclaim: 9992 kB
KernelStack: 2896 kB
PageTables: 1912 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 1520032 kB
Committed_AS: 1356900 kB
VmallocTotal: 241656 kB
VmallocUsed: 7384 kB
VmallocChunk: 224856 kB
HardwareCorrupted: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 4096 kB
DirectMap4k: 35840 kB
DirectMap4M: 749568 kB
$cat /sys/kernel/debug/dri/0/i915_gem_objects
Xorg: 484 objects, 218091520 bytes (0 active, 211959808 inactive, 211959808 global, 1921024 shared, 1757184 unbound)
对象字节增长，达到440MB！
如何分析哪个进程/消耗了缓存的内存？