cat /proc/meminfo
---------
MemTotal: 7990416 kB
MemFree: 2094352 kB
MemAvailable: 2506396 kB
Buffers: 44 kB
Cached: 1040004 kB
SwapCached: 144332 kB
Active: 1947668 kB
Inactive: 699264 kB
Active(anon): 1898344 kB
Inactive(anon): 580272 kB
Active(file): 49324 kB
Inactive(file): 118992 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 9437172 kB
SwapFree: 803596 kB
Dirty: 40 kB
Writeback: 0 kB
AnonPages: 1462784 kB
Mapped: 928188 kB
Shmem: 871688 kB
Slab: 2190580 kB
SReclaimable: 557436 kB
SUnreclaim: 1633144 kB
KernelStack: 55904 kB
PageTables: 144848 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 13432380 kB
Committed_AS: 8070896 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 134996 kB
VmallocChunk: 34359548340 kB
HardwareCorrupted: 0 kB
AnonHugePages: 114688 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 350144 kB
DirectMap2M: 6989824 kB
DirectMap1G: 3145728 kB
free -m
-----
total used free shared buff/cache available
Mem: 7803 2553 2083 838 3166 2463
Swap: 9215 8464 751
--
cat /proc/sys/vm/swappiness
30
答案1
由于可用mem约为30%，因此vm swappiness值为30。
更改交换值：
编辑或创建文件 /etc/sysctl.d/99-sysctl.conf
vm.swappiness=5