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mithrial · 2026-06-29 · via Arch Linux Forums

Pages: 1

#1 Today 15:12:40

bivan: Member; Registered: 2026-02-03; Posts: 44

Why Arch Linux KDE still uses RAM after closing?

I start Arch Linux KDE, RAM used: 1.4 GiB, according to System Monitor.
Then e.g. I use Chromium, Steam, then I close all: 2.0 GiB, why not 1.4 GiB as before? What is the remaining 0.6 GiB?

#2 Today 15:29:14

seth: Member; From: Won't reply 2 private help req; Registered: 2012-09-03; Posts: 76,365

Re: Why Arch Linux KDE still uses RAM after closing?

Probably the file cache - those RAM usage aggregators look fancy on r/unixporn but are completely useless for any meaningful insight.
Compare

"free -h" at least separates the cache

#3 Today 15:59:43

bivan: Member; Registered: 2026-02-03; Posts: 44

Re: Why Arch Linux KDE still uses RAM after closing?

At start:

[a@f44101f2-e4b3-4b62-9eed-a988c75d2c02 ~]$ free -h
cat /proc/meminfo
               total        used        free      shared  buff/cache   available
Mem:            31Gi       1.3Gi        29Gi        17Mi       762Mi        29Gi
Swap:           15Gi          0B        15Gi
MemTotal:       32777324 kB
MemFree:        31119604 kB
MemAvailable:   31449564 kB
Buffers:            1584 kB
Cached:           736740 kB
SwapCached:            0 kB
Active:           935924 kB
Inactive:         182848 kB
Active(anon):     444960 kB
Inactive(anon):        0 kB
Active(file):     490964 kB
Inactive(file):   182848 kB
Unevictable:       46928 kB
Mlocked:               0 kB
SwapTotal:      16777212 kB
SwapFree:       16777212 kB
Zswap:                 0 kB
Zswapped:              0 kB
Dirty:                76 kB
Writeback:             0 kB
AnonPages:        427376 kB
Mapped:           396632 kB
Shmem:             17708 kB
KReclaimable:      42504 kB
Slab:             122724 kB
SReclaimable:      42504 kB
SUnreclaim:        80220 kB
KernelStack:        7488 kB
PageTables:        12528 kB
SecPageTables:      2892 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    33165872 kB
Committed_AS:    2226368 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      126096 kB
VmallocChunk:          0 kB
Percpu:            13248 kB
HardwareCorrupted:     0 kB
AnonHugePages:    135168 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
FileHugePages:         0 kB
FilePmdMapped:         0 kB
CmaTotal:              0 kB
CmaFree:               0 kB
Unaccepted:            0 kB
Balloon:               0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
DirectMap4k:      360480 kB
DirectMap2M:     5851136 kB
DirectMap1G:    27262976 kB

then Chromium, Steam, then close all:

[a@f44101f2-e4b3-4b62-9eed-a988c75d2c02 ~]$ free -h
cat /proc/meminfo
               total        used        free      shared  buff/cache   available
Mem:            31Gi       1.5Gi        27Gi        22Mi       2.4Gi        29Gi
Swap:           15Gi          0B        15Gi
MemTotal:       32777324 kB
MemFree:        29246296 kB
MemAvailable:   31229268 kB
Buffers:            1584 kB
Cached:          2354048 kB
SwapCached:            0 kB
Active:          2297324 kB
Inactive:         511344 kB
Active(anon):     522616 kB
Inactive(anon):        0 kB
Active(file):    1774708 kB
Inactive(file):   511344 kB
Unevictable:       46928 kB
Mlocked:               0 kB
SwapTotal:      16777212 kB
SwapFree:       16777212 kB
Zswap:                 0 kB
Zswapped:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:        498668 kB
Mapped:           420956 kB
Shmem:             22780 kB
KReclaimable:     124044 kB
Slab:             228244 kB
SReclaimable:     124044 kB
SUnreclaim:       104200 kB
KernelStack:        7008 kB
PageTables:        13296 kB
SecPageTables:      3324 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    33165872 kB
Committed_AS:    2439436 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      126116 kB
VmallocChunk:          0 kB
Percpu:            13824 kB
HardwareCorrupted:     0 kB
AnonHugePages:    188416 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
FileHugePages:         0 kB
FilePmdMapped:         0 kB
CmaTotal:              0 kB
CmaFree:               0 kB
Unaccepted:            0 kB
Balloon:               0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
DirectMap4k:      716832 kB
DirectMap2M:    10737664 kB
DirectMap1G:    22020096 kB

indeed Cached: increased, so it's https://en.wikipedia.org/wiki/Page_cache https://www.linuxatemyram.com/ ?
Now, maybe I should create a new topic? How to disable the page cache? Googling "arch linux disable page cache": https://unix.stackexchange.com/question … page-cache "It is not possible"...

Last edited by bivan (Today 16:04:49)

#4 Today 16:16:27

mithrial: Member; Registered: 2017-03-05; Posts: 155

Re: Why Arch Linux KDE still uses RAM after closing?

Why would you need to disable it?

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Arch Linux Forums

#1 Today 15:12:40

Why Arch Linux KDE still uses RAM after closing?

#2 Today 15:29:14

Re: Why Arch Linux KDE still uses RAM after closing?

#3 Today 15:59:43

Re: Why Arch Linux KDE still uses RAM after closing?

#4 Today 16:16:27

Re: Why Arch Linux KDE still uses RAM after closing?