我们在Microsoft
Windows 2012 Server(Hypervisor)上运行了一些64位
Linux机箱(RHEL6),但问题相同.这些Linux客户机服务器在MS Windows Cloud(Hyper-V)中运行,具有16个主机服务器,每个服务器具有256 GB RAM.
它们从以下内存使用开始：
# free -m
total used free shared buffers cached
Mem: 48259 653 47606 0 19 106
-/+ buffers/cache: 527 47732
Swap: 13999 0 13999
# cat /proc/meminfo
MemTotal: 49418204 kB
MemFree: 48749868 kB
Buffers: 20080 kB
Cached: 108564 kB
SwapCached: 0 kB
Active: 149652 kB
Inactive: 98856 kB
Active(anon): 120124 kB
Inactive(anon): 1884 kB
Active(file): 29528 kB
Inactive(file): 96972 kB
Unevictable: 4 kB
Mlocked: 4 kB
SwapTotal: 14335992 kB
SwapFree: 14335992 kB
Dirty: 788 kB
Writeback: 0 kB
AnonPages: 122196 kB
Mapped: 39844 kB
Shmem: 2132 kB
Slab: 51832 kB
SReclaimable: 14696 kB
SUnreclaim: 37136 kB
KernelStack: 5656 kB
PageTables: 15840 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 39045092 kB
Committed_AS: 490856 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 131964 kB
VmallocChunk: 34359602252 kB
HardwareCorrupted: 0 kB
AnonHugePages: 28672 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 8128 kB
DirectMap2M: 50323456 kB
(由RES订购)
# top top - 11:26:52 up 1 min,1 user,load average: 1.71,0.73,0.27 Tasks: 609 total,1 running,608 sleeping,0 stopped,0 zombie cpu(s): 0.0%us,0.1%sy,0.0%ni,99.8%id,0.0%wa,0.1%hi,0.0%si,0.0%st Mem: 49418204k total,674472k used,48743732k free,20472k buffers Swap: 14335992k total,0k used,14335992k free,111720k cached PID USER PR NI VIRT RES SHR S %cpu %MEM TIME+ COMMAND 1859 root 20 0 103m 28m 5784 S 0.0 0.1 0:00.85 Xvnc 2037 root 20 0 508m 25m 8876 S 0.7 0.1 0:01.18 gnome-settings- 2064 root 20 0 373m 17m 12m S 0.0 0.0 0:01.11 nautilus 2141 root 20 0 464m 16m 12m S 0.0 0.0 0:00.14 clock-applet 2063 root 20 0 319m 14m 10m S 0.0 0.0 0:00.28 gnome-panel 2082 root 20 0 307m 12m 9100 S 0.0 0.0 0:00.11 nm-applet 2139 root 20 0 381m 12m 9748 S 0.0 0.0 0:00.08 gdm-user-switch 2093 root 20 0 442m 11m 9104 S 0.0 0.0 0:00.13 gnome-volume-co 2116 root 20 0 299m 11m 9476 S 0.0 0.0 0:00.10 wnck-applet 2118 root 20 0 307m 11m 8768 S 0.0 0.0 0:00.06 trashapplet ...
6分钟后,内存被未知进程或内核消耗：
uptime ; free -m
11:31:52 up 6 min,load average: 1.05,0.93,0.47
total used free shared buffers cached
Mem: 48259 25296 22963 0 21 160
-/+ buffers/cache: 25115 23144
Swap: 13999 0 13999
]# cat /proc/meminfo
MemTotal: 49418204 kB
MemFree: 23514240 kB
Buffers: 21600 kB
Cached: 164428 kB
SwapCached: 0 kB
Active: 210768 kB
Inactive: 108108 kB
Active(anon): 133036 kB
Inactive(anon): 2332 kB
Active(file): 77732 kB
Inactive(file): 105776 kB
Unevictable: 8 kB
Mlocked: 8 kB
SwapTotal: 14335992 kB
SwapFree: 14335992 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 132892 kB
Mapped: 41976 kB
Shmem: 2516 kB
Slab: 52624 kB
SReclaimable: 17628 kB
SUnreclaim: 34996 kB
KernelStack: 5752 kB
PageTables: 15756 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 39045092 kB
Committed_AS: 654848 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 131964 kB
VmallocChunk: 34359602252 kB
HardwareCorrupted: 0 kB
AnonHugePages: 45056 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 8128 kB
DirectMap2M: 50323456 kB
(由RES订购)
# top top - 11:32:45 up 7 min,load average: 1.02,0.94,0.50 Tasks: 607 total,606 sleeping,0 zombie cpu(s): 0.1%us,99.7%id,0.0%hi,25904096k used,23514108k free,21600k buffers Swap: 14335992k total,164428k cached PID USER PR NI VIRT RES SHR S %cpu %MEM TIME+ COMMAND 1859 root 20 0 103m 28m 6176 S 0.0 0.1 0:00.87 Xvnc 2037 root 20 0 508m 25m 8916 S 0.0 0.1 0:01.19 gnome-settings- 2064 root 20 0 373m 17m 12m S 0.0 0.0 0:01.61 nautilus 2141 root 20 0 464m 16m 12m S 0.0 0.0 0:00.15 clock-applet 2063 root 20 0 319m 14m 10m S 0.0 0.0 0:00.29 gnome-panel 1788 root 20 0 779m 13m 5808 S 0.0 0.0 0:00.18 scxcimserver 2082 root 20 0 307m 12m 9100 S 0.0 0.0 0:00.11 nm-applet 2139 root 20 0 381m 12m 9748 S 0.0 0.0 0:00.08 gdm-user-switch 2093 root 20 0 442m 11m 9104 S 0.0 0.0 0:00.13 gnome-volume-co 2116 root 20 0 299m 11m 9476 S 0.0 0.0 0:00.10 wnck-applet ...
以MB为单位报告的RSS内存总和约为388：
# ps aux | awk '{sum+=$6} END {print sum / 1024}'
387.898
还有什么可以检查以找出消耗内存的内容？
解决方法
听起来Hyper-V正在窃取内存,因为主机过度配置,这个过程称为
memory ballooning(或Hyper-V世界中的动态内存).
