XFS: nfsd(13480) possible memory allocation deadlock size 65532 in kmem_realloc
環境
NFS Server: CentOS 7.6
NFS Client: Aix 7.1
Oracle Version: 9.2.0.8
問題
（1）現象表現
Aix掛載CentOS 7.6 nfs之後，使用Oracle RMAN恢復到一定階段，表現為cd進入NFS server端或NFS client端
ls檢視或者df檢視檔案系統均會卡住不出結果，使用iotop檢視nfs程式io讀寫均無讀寫，呈現hang住狀態。
（2）作業系統日誌
NFS Server作業系統日誌：
/var/log/message
XFS: nfsd(13480) possible memory allocation deadlock size 65532 in kmem_realloc (mode:0x250)
原因
由於記憶體碎片過多，無法分配連續大塊記憶體導致程式等待記憶體回收。
min_free_kbytes設定過小，CentOS預設設定60M
解決
調整為4G
（1）立即釋放
echo 4194304 > /proc/sys/vm/min_free_kbytes
（2）永久設定
vi /etc/sysctl.conf
vm.min_free_kbytes = 4194304
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/31439444/viewspace-2740738/，如需轉載，請註明出處，否則將追究法律責任。
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