以下输出meminfo来自 Proxmox 虚拟机管理程序。我今天注意到交换使用率为 90%。我登录到框并检查，似乎实际上有 24G 的非活动 RAM。几分钟后，我注意到交换使用率为 99%。
当有这么多非活动 RAM 可用时，为什么内核似乎倾向于磁盘交换（编辑：vmstat -s下面添加）？
# cat /proc/meminfo
MemTotal: 131911836 kB
MemFree: 28128112 kB
MemAvailable: 51794976 kB
Buffers: 397876 kB
Cached: 23298352 kB
SwapCached: 509796 kB
Active: 73136224 kB
Inactive: 24833836 kB
Active(anon): 72432368 kB
Inactive(anon): 2030612 kB
Active(file): 703856 kB
Inactive(file): 22803224 kB
Unevictable: 20256 kB
Mlocked: 20260 kB
SwapTotal: 8388604 kB
SwapFree: 76592 kB
Dirty: 216 kB
Writeback: 0 kB
AnonPages: 73881564 kB
Mapped: 196212 kB
Shmem: 182376 kB
Slab: 3837772 kB
SReclaimable: 1413588 kB
SUnreclaim: 2424184 kB
KernelStack: 10608 kB
PageTables: 281164 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 74344520 kB
Committed_AS: 265844288 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2787328 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 3584964 kB
DirectMap2M: 118982656 kB
DirectMap1G: 13631488 kB
vmstat -s
131911840 K total memory
85913712 K used memory
80380944 K active memory
24732132 K inactive memory
20989356 K free memory
405840 K buffer memory
24602928 K swap cache
8388604 K total swap
8311256 K used swap
77348 K free swap
62711183 non-nice user cpu ticks
711584 nice user cpu ticks
19418784 system cpu ticks
2202190185 idle cpu ticks
12801599 IO-wait cpu ticks
0 IRQ cpu ticks
583222 softirq cpu ticks
0 stolen cpu ticks
11537252613 pages paged in
3575771252 pages paged out
1581238 pages swapped in
3670384 pages swapped out
3388189898 interrupts
3739302263 CPU context switches
1535799398 boot time
3674458 forks