我有一台运行 Ubuntu 5.15 内核的 8GB 机器。即使重新启动后，我也只有 1GB 可用内存。我尝试了free -m和cat /proc/meminfo技巧ps aux来列出最消耗内存的进程（最消耗的是 200MB）。我在下面提供这些的输出。这可能是什么原因以及如何解决？
MemTotal: 7751740 kB
MemFree: 472272 kB
MemAvailable: 962800 kB
Buffers: 39668 kB
Cached: 652640 kB
SwapCached: 0 kB
Active: 218316 kB
Inactive: 816804 kB
Active(anon): 2512 kB
Inactive(anon): 349956 kB
Active(file): 215804 kB
Inactive(file): 466848 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 2097148 kB
SwapFree: 2097148 kB
Dirty: 404 kB
Writeback: 0 kB
AnonPages: 342880 kB
Mapped: 253212 kB
Shmem: 14380 kB
KReclaimable: 65340 kB
Slab: 491344 kB
SReclaimable: 65340 kB
SUnreclaim: 426004 kB
KernelStack: 13984 kB
PageTables: 12200 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 5973016 kB
Committed_AS: 3450184 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 62028 kB
VmallocChunk: 0 kB
Percpu: 35840 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
FileHugePages: 0 kB
FilePmdMapped: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
DirectMap4k: 439756 kB
DirectMap2M: 4423680 kB
DirectMap1G: 5242880 kB
free -m 的输出：
total used free shared buff/cache available
Mem: 7570 6374 451 14 744 934
Swap: 2047 0 2047
输出ps aux | awk '{print $6/1024 " MB\t\t" $11}' | sort -n：
.
.
.
17.1641 MB /usr/libexec/gnome-session-binary
18.0469 MB /usr/sbin/NetworkManager
20.0547 MB /usr/libexec/packagekitd
20.5898 MB /usr/libexec/gsd-keyboard
21.0039 MB /usr/bin/python3
21.4297 MB /usr/libexec/gsd-wacom
22.0117 MB /usr/bin/pulseaudio
22.7617 MB /usr/bin/python3
24.2656 MB /usr/libexec/gsd-power
24.4805 MB /usr/libexec/gsd-color
24.5625 MB /usr/bin/pulseaudio
25.2344 MB /usr/libexec/tracker-miner-fs-3
25.7227 MB /usr/libexec/gsd-media-keys
26.9805 MB /usr/bin/gjs
27.0859 MB /usr/bin/gjs
30.0234 MB /usr/libexec/tracker-extract-3
37.3438 MB /usr/lib/snapd/snapd
38.2695 MB /usr/libexec/goa-daemon
53.3516 MB /lib/systemd/systemd-journald
86.5469 MB /usr/bin/Xwayland
199.949 MB /usr/bin/gnome-shell
输出df | grep tmpfs：
tmpfs 775176 2396 772780 1% /run
tmpfs 3875868 0 3875868 0% /dev/shm
tmpfs 5120 4 5116 1% /run/lock
tmpfs 775172 76 775096 1% /run/user/127
tmpfs 775172 68 775104 1% /run/user/1001