该主机经常过一段时间就会发生内存耗尽的问题，但是cache/buffer占用的也不大，top也没找到占用内存大的进程，每次都是重启解决，求指教看看这个是为什么
操作系统版本：redhat 6.5
（1）内存使用情况如下
free -g
total used free shared buffers cached
Mem: 125 125 0 0 0 0
-/+ buffers/cache: 125 0
Swap: 7 6 0
（2）cat /proc/meminfo
MemTotal: 132104256 kB
MemFree: 418584 kB
Buffers: 58028 kB
Cached: 150124 kB
SwapCached: 141208 kB
Active: 8365864 kB
Inactive: 893836 kB
Active(anon): 8259128 kB
Inactive(anon): 797344 kB
Active(file): 106736 kB
Inactive(file): 96492 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 8191992 kB
SwapFree: 960772 kB
Dirty: 628 kB
Writeback: 0 kB
AnonPages: 8911964 kB
Mapped: 32232 kB
Shmem: 4848 kB
Slab: 3533416 kB
SReclaimable: 55300 kB
SUnreclaim: 3478116 kB
KernelStack: 21936 kB
PageTables: 54740 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 74244120 kB
Committed_AS: 20592048 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 525040 kB
VmallocChunk: 34258137808 kB
HardwareCorrupted: 0 kB
AnonHugePages: 7575552 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 4928 kB
DirectMap2M: 2045952 kB
DirectMap1G: 132120576 kB
（3）top命令用内存排序后的结果
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