10GB memorys occupied by XFS

[daiguochao]

Hello folks,

I used xfs file system in kernel-2.6.32-220.13.1.el6.x86_64 for store
pictures. About 100 days system memorys is lost and some nginx process is
killed by oom-killer.So,I looked /proc/meminfo and find memorys is
lost.Finally, I try to umount xfs system and 10GB memorys is coming back. l
look xfs bugzilla no such BUG.I have no idea for it.

Cheers,

Guochao.

some memorys info:

0> free -m
             total       used       free     shared    buffers     cached
Mem:         11887      11668        219          0          0          2
-/+ buffers/cache:      11665        222
Swap:            0          0          0

130> cat /proc/meminfo 
MemTotal:       12173268 kB
MemFree:          223044 kB
Buffers:             244 kB
Cached:             4540 kB
SwapCached:            0 kB
Active:             1700 kB
Inactive:           5312 kB
Active(anon):       1616 kB
Inactive(anon):     1128 kB
Active(file):         84 kB
Inactive(file):     4184 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:          2556 kB
Mapped:             1088 kB
Shmem:               196 kB
Slab:             509708 kB
SReclaimable:       7596 kB
SUnreclaim:       502112 kB
KernelStack:        1096 kB
PageTables:          748 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     6086632 kB
Committed_AS:       9440 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      303488 kB
VmallocChunk:   34359426132 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        6152 kB
DirectMap2M:     2070528 kB
DirectMap1G:    10485760 kB



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