我遇到了一些记忆问题，我不知道该如何解释，而且我没有足够的知识来正确调查它。希望有人能指导我。
从昨天开始，我的笔记本电脑（Ubuntu 20.04）在使用一段时间后内存耗尽。这些事件期间唯一运行的软件是：Firefox、2 个 Discord 实例、VisualCodeStudio 和 TelegramDesktop。
令我烦恼的是，当一切开始变得非常慢（交换内存开始被使用）时，我会立即关闭所有软件，希望释放分配的内存，但即使在此之后，我的所有 16GB RAM 仍然保持分配状态。
这让我认为内存正在被 Xorg 使用。可以得出结论吗？有人能帮我解决这个问题吗？非常感谢。
这是我的 lshw 输出：
pcpj-predator
description: Notebook
product: Predator PH315-52 (0000000000000000)
vendor: Acer
version: V1.11
serial: NHQ63AL002040278109501
width: 64 bits
capabilities: smbios-3.0.1 dmi-3.0.1 smp vsyscall32
configuration: chassis=notebook family=Predator Helios 300 sku=0000000000000000 uuid=7971E58C-E699-EA4C-BFD2-99503FD6C9D2
*-core
description: Motherboard
product: Covini_CFS
vendor: CFL
physical id: 0
version: V1.11
serial: NBQ5411004041004059501
slot: Type2 - Board Chassis Location
*-firmware
description: BIOS
vendor: Insyde Corp.
physical id: 0
version: V1.11
date: 03/25/2020
size: 128KiB
capacity: 15MiB
capabilities: pci upgrade shadowing cdboot bootselect edd int13floppynec int13floppytoshiba int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int9keyboard int10video acpi usb biosbootspecification uefi
*-cpu
description: CPU
product: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
vendor: Intel Corp.
physical id: 4
bus info: cpu@0
version: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
serial: To Be Filled By O.E.M.
slot: U3E1
size: 4018MHz
capacity: 4500MHz
width: 64 bits
clock: 100MHz
capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d cpufreq
configuration: cores=6 enabledcores=6 threads=12
*-cache:0
description: L1 cache
physical id: 5
slot: L1 Cache
size: 384KiB
capacity: 384KiB
capabilities: synchronous internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: 6
slot: L2 Cache
size: 1536KiB
capacity: 1536KiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: 7
slot: L3 Cache
size: 12MiB
capacity: 12MiB
capabilities: synchronous internal write-back unified
configuration: level=3
*-memory
description: System Memory
physical id: d
slot: System board or motherboard
size: 16GiB
*-bank:0
description: SODIMM DDR4 Synchronous 2667 MHz (0,4 ns)
product: SF4642G8CK8IEHLSBG
vendor: AMD
physical id: 0
serial: 055ED6D2
slot: ChannelA-DIMM0
size: 16GiB
width: 64 bits
clock: 2667MHz (0.4ns)
*-bank:1
description: [empty]
physical id: 1
slot: ChannelB-DIMM0
*-pci
description: Host bridge
product: 8th Gen Core Processor Host Bridge/DRAM Registers
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 07
width: 32 bits
clock: 33MHz
configuration: driver=skl_uncore
resources: irq:0
*-pci:0
description: PCI bridge
product: Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16)
vendor: Intel Corporation
physical id: 1
bus info: pci@0000:00:01.0
version: 07
width: 32 bits
clock: 33MHz
capabilities: pci pm msi pciexpress normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:122 ioport:4000(size=4096) memory:a0000000-b40fffff ioport:b4100000(size=1048576)
*-display
description: VGA compatible controller
product: TU106M [GeForce RTX 2060 Mobile]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:152 memory:b3000000-b3ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:4000(size=128) memory:b2000000-b207ffff
*-multimedia
description: Audio device
product: TU106 High Definition Audio Controller
vendor: NVIDIA Corporation
physical id: 0.1
bus info: pci@0000:01:00.1
version: a1
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:17 memory:b4000000-b4003fff
*-usb
description: USB controller
product: TU106 USB 3.1 Host Controller
vendor: NVIDIA Corporation
physical id: 0.2
bus info: pci@0000:01:00.2
version: a1
width: 64 bits
clock: 33MHz
capabilities: msi pciexpress pm xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:141 memory:b4100000-b413ffff memory:b4140000-b414ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 5.11.0-38-generic xhci-hcd
physical id: 0
bus info: usb@3
logical name: usb3
version: 5.11
capabilities: usb-2.00
configuration: driver=hub slots=2 speed=480Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 5.11.0-38-generic xhci-hcd
physical id: 1
bus info: usb@4
logical name: usb4
version: 5.11
capabilities: usb-3.10
configuration: driver=hub slots=4 speed=10000Mbit/s
*-serial
description: Serial bus controller
product: TU106 USB Type-C UCSI Controller
vendor: NVIDIA Corporation
physical id: 0.3
bus info: pci@0000:01:00.3
version: a1
width: 32 bits
clock: 33MHz
capabilities: msi pciexpress pm bus_master cap_list
configuration: driver=nvidia-gpu latency=0
resources: irq:125 memory:b4004000-b4004fff
*-display
description: VGA compatible controller
product: UHD Graphics 630 (Mobile)
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:150 memory:b5000000-b5ffffff memory:90000000-9fffffff ioport:5000(size=64) memory:c0000-dffff
*-generic:0
description: Signal processing controller
product: Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
vendor: Intel Corporation
physical id: 4
bus info: pci@0000:00:04.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: msi pm bus_master cap_list
configuration: driver=proc_thermal latency=0
resources: irq:16 memory:b4510000-b4517fff
*-generic:1 UNCLAIMED
description: System peripheral
product: Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
vendor: Intel Corporation
physical id: 8
bus info: pci@0000:00:08.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: msi pm bus_master cap_list
configuration: latency=0
resources: memory:b4524000-b4524fff
*-generic:2
description: Signal processing controller
product: Cannon Lake PCH Thermal Controller
vendor: Intel Corporation
physical id: 12
bus info: pci@0000:00:12.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=intel_pch_thermal latency=0
resources: irq:16 memory:b4525000-b4525fff
*-usb
description: USB controller
product: Cannon Lake PCH USB 3.1 xHCI Host Controller
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:126 memory:b4500000-b450ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 5.11.0-38-generic xhci-hcd
physical id: 0
bus info: usb@1
logical name: usb1
version: 5.11
capabilities: usb-2.00
configuration: driver=hub slots=16 speed=480Mbit/s
*-usb:0
description: Mouse
product: USB Gaming Mouse
vendor: E-Signal
physical id: 5
bus info: usb@1:5
version: 1.30
capabilities: usb-2.00
configuration: driver=usbhid maxpower=100mA speed=12Mbit/s
*-usb:1
description: Video
product: HD User Facing
vendor: SunplusIT Inc
physical id: 7
bus info: usb@1:7
version: 0.04
capabilities: usb-2.01
configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 5.11.0-38-generic xhci-hcd
physical id: 1
bus info: usb@2
logical name: usb2
version: 5.11
capabilities: usb-3.10
configuration: driver=hub slots=8 speed=10000Mbit/s
*-memory UNCLAIMED
description: RAM memory
product: Cannon Lake PCH Shared SRAM
vendor: Intel Corporation
physical id: 14.2
bus info: pci@0000:00:14.2
version: 10
width: 64 bits
clock: 33MHz (30.3ns)
capabilities: pm bus_master cap_list
configuration: latency=0
resources: memory:b4520000-b4521fff memory:b4526000-b4526fff
*-network
description: Wireless interface
product: Wireless-AC 9560 [Jefferson Peak]
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 10
serial: cc:d9:ac:8f:60:e7
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.11.0-38-generic firmware=46.4d093a30.0 9000-pu-b0-jf-b0- ip=192.168.100.6 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:b4518000-b451bfff
*-serial:0
description: Serial bus controller
product: Cannon Lake PCH Serial IO I2C Controller #0
vendor: Intel Corporation
physical id: 15
bus info: pci@0000:00:15.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:16 memory:8f800000-8f800fff
*-serial:1
description: Serial bus controller
product: Cannon Lake PCH Serial IO I2C Controller #1
vendor: Intel Corporation
physical id: 15.1
bus info: pci@0000:00:15.1
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:17 memory:8f801000-8f801fff
*-communication
description: Communication controller
product: Cannon Lake PCH HECI Controller
vendor: Intel Corporation
physical id: 16
bus info: pci@0000:00:16.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=mei_me latency=0
resources: irq:143 memory:b4529000-b4529fff
*-sata
description: SATA controller
product: Cannon Lake Mobile PCH SATA AHCI Controller
vendor: Intel Corporation
physical id: 17
bus info: pci@0000:00:17.0
version: 10
width: 32 bits
clock: 66MHz
capabilities: sata msi pm ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=0
resources: irq:127 memory:b4522000-b4523fff memory:b452d000-b452d0ff ioport:5080(size=8) ioport:5088(size=4) ioport:5060(size=32) memory:b452c000-b452c7ff
*-pci:1
description: PCI bridge
product: Cannon Lake PCH PCI Express Root Port #9
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: f0
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:123 memory:b4400000-b44fffff
*-storage
description: Non-Volatile memory controller
product: NVMe SSD Controller SM981/PM981/PM983
vendor: Samsung Electronics Co Ltd
physical id: 0
bus info: pci@0000:06:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: storage pm msi pciexpress msix nvm_express bus_master cap_list
configuration: driver=nvme latency=0
resources: irq:16 memory:b4400000-b4403fff
*-nvme0
description: NVMe device
product: SAMSUNG MZVLB256HBHQ-00007
physical id: 0
logical name: /dev/nvme0
version: EXH7202Q
serial: S4GHNF0MC02531
configuration: nqn=nqn.2014.08.org.nvmexpress:144d144dS4GHNF0MC02531 SAMSUNG MZVLB256HBHQ-00007 state=live
*-namespace
description: NVMe namespace
physical id: 1
logical name: /dev/nvme0n1
size: 238GiB (256GB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: guid=7decc6c7-3b0e-4cd0-9008-614d955451d8 logicalsectorsize=512 sectorsize=512
*-volume:0 UNCLAIMED
description: Windows FAT volume
vendor: mkfs.fat
physical id: 1
version: FAT32
serial: 6991-fa2b
size: 474MiB
capacity: 475MiB
capabilities: boot fat initialized
configuration: FATs=2 filesystem=fat
*-volume:1
description: EXT4 volume
vendor: Linux
physical id: 2
logical name: /dev/nvme0n1p2
logical name: /
version: 1.0
serial: e327cf7b-33b8-42e0-b5f8-aa9da41e7482
size: 223GiB
capabilities: journaled extended_attributes large_files huge_files dir_nlink recover 64bit extents ext4 ext2 initialized
configuration: created=2021-09-13 09:37:18 filesystem=ext4 lastmountpoint=/ modified=2021-10-22 09:35:55 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro mounted=2021-10-22 09:35:55 state=mounted
*-volume:2
description: Linux swap volume
vendor: Linux
physical id: 3
logical name: /dev/nvme0n1p3
version: 1
serial: a9599deb-1fbe-45d7-98bd-db34f8ac974d
size: 14GiB
capacity: 14GiB
capabilities: nofs swap initialized
configuration: filesystem=swap pagesize=4095
*-pci:2
description: PCI bridge
product: Cannon Lake PCH PCI Express Root Port #13
vendor: Intel Corporation
physical id: 1d.4
bus info: pci@0000:00:1d.4
version: f0
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:124 ioport:3000(size=4096) memory:b4300000-b43fffff
*-network
description: Ethernet interface
product: Killer E2500 Gigabit Ethernet Controller
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 10
serial: 7c:8a:e1:dc:50:7e
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=alx driverversion=5.11.0-38-generic latency=0 link=no multicast=yes port=twisted pair
resources: irq:16 memory:b4300000-b433ffff ioport:3000(size=128)
*-isa
description: ISA bridge
product: HM470 Chipset LPC/eSPI Controller
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 10
width: 32 bits
clock: 33MHz
capabilities: isa bus_master
configuration: latency=0
*-multimedia
description: Audio device
product: Cannon Lake PCH cAVS
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:151 memory:b451c000-b451ffff memory:b4200000-b42fffff
*-serial:2
description: SMBus
product: Cannon Lake PCH SMBus Controller
vendor: Intel Corporation
physical id: 1f.4
bus info: pci@0000:00:1f.4
version: 10
width: 64 bits
clock: 33MHz
configuration: driver=i801_smbus latency=0
resources: irq:16 memory:b452a000-b452a0ff ioport:5040(size=32)
*-serial:3 UNCLAIMED
description: Serial bus controller
product: Cannon Lake PCH SPI Controller
vendor: Intel Corporation
physical id: 1f.5
bus info: pci@0000:00:1f.5
version: 10
width: 32 bits
clock: 33MHz
capabilities: bus_master
configuration: latency=0
resources: memory:fe010000-fe010fff
*-pnp00:00
product: PnP device PNP0c02
physical id: 1
capabilities: pnp
configuration: driver=system
*-pnp00:01
product: PnP device PNP0c02
physical id: 2
capabilities: pnp
configuration: driver=system
*-pnp00:02
product: PnP device PNP0c02
physical id: 3
capabilities: pnp
configuration: driver=system
*-pnp00:03
product: PnP device PNP0c02
physical id: 5
capabilities: pnp
configuration: driver=system
*-pnp00:04
product: PnP device INT3f0d
physical id: 6
capabilities: pnp
configuration: driver=system
*-pnp00:05
product: PnP device PNP0303
physical id: 7
capabilities: pnp
configuration: driver=i8042 kbd
*-pnp00:06
product: PnP device PNP0c02
physical id: 8
capabilities: pnp
configuration: driver=system
*-pnp00:07
product: PnP device PNP0c02
physical id: 9
capabilities: pnp
configuration: driver=system
*-scsi
physical id: a
logical name: scsi4
capabilities: emulated
*-disk
description: ATA Disk
product: WDC WD10SPZX-21Z
vendor: Western Digital
physical id: 0.0.0
bus info: scsi@4:0.0.0
logical name: /dev/sda
version: 1A02
serial: WD-WX22A70R4VV2
size: 931GiB (1TB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: ansiversion=5 guid=98a5899a-2b39-dd4c-9cc5-63ce453cf021 logicalsectorsize=512 sectorsize=4096
*-volume:0
description: Windows NTFS volume
vendor: Windows
physical id: 1
bus info: scsi@4:0.0.0,1
logical name: /dev/sda1
logical name: /home/pcpj/1TBHD
version: 3.1
serial: 6844-9b43
size: 927GiB
capacity: 927GiB
capabilities: ntfs initialized
configuration: clustersize=4096 created=2021-03-18 14:32:05 filesystem=ntfs mount.fstype=fuseblk mount.options=rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096 name=DataStorage state=mounted
*-volume:1
description: Windows NTFS volume
vendor: Windows
physical id: 4
bus info: scsi@4:0.0.0,4
logical name: /dev/sda4
version: 3.1
serial: 1232-80ee
size: 4570MiB
capacity: 4579MiB
capabilities: ntfs initialized
configuration: clustersize=4096 created=2020-09-29 14:44:35 filesystem=ntfs label=WINDRIVER name=Basic data partition state=clean