missing memory
by axet from LinuxQuestions.org on (#543Y9)
Hello!
I'm trying to understand where my free memory goes. No, this is not about usual caches and buffers.
To clear the process I'm using clear linux machine after reboot, steps:
1) reboot into rescue mode
2) su user
Memory usage about 200M showed in htop and /proc/meminfo
Then I start a wine game:
3) startx ~/bin/game
Play it for a few moments and exit. Memory usage 1.6G after exiting the game and it stays used.
I'm trying to understand where this memory goes. But I do not see any trails. I able to clam back this memory by issuing:
echo 2 > /proc/sys/vm/drop_caches
But this does not explain who using it. I did compare /proc/meminfo before and after drop_caches. I see only significant change in MemAvailable (1.2G change) but everything else stays almost the same (nor slab, nor buffers, nor cached).
I did ran slabtop - same, nothing calming to have 1.2G of memory. Any suggestion how I can see kernel memory usage by module / type?
EDIT: simple script shows what is going on:
Code:#!/bin/bash
free -m
echo
echo "----- meminfo"
cat /proc/meminfo
echo
echo "----- ps_mem (https://github.com/pixelb/ps_mem)"
sudo ~/bin/ps_mem.py
echo
echo "----- dmesg info"
dmesg | grep Memory: | grep -E -o '[0-9]+K (kernel code|data|rwdata|rodata|init)' && awk '{print $2/1024 "K " $1 }' /proc/modules | sort -hr | head
echo
echo "----- slabtop"
sudo slabtop -s c -o | head -201) fresh reboot (200M used)
Code: total used free shared buff/cache available
Mem: 5944 189 5541 1 214 5522
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 5673864 kB
MemAvailable: 5654600 kB
Buffers: 36144 kB
Cached: 146924 kB
SwapCached: 0 kB
Active: 128120 kB
Inactive: 91760 kB
Active(anon): 37308 kB
Inactive(anon): 816 kB
Active(file): 90812 kB
Inactive(file): 90944 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 120 kB
Writeback: 0 kB
AnonPages: 34836 kB
Mapped: 55800 kB
Shmem: 1308 kB
KReclaimable: 36492 kB
Slab: 110228 kB
SReclaimable: 36492 kB
SUnreclaim: 73736 kB
KernelStack: 2944 kB
PageTables: 1392 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 197488 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27132 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 136616 kB
DirectMap2M: 3989504 kB
DirectMap1G: 3145728 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 63.5 KiB = 207.5 KiB swapspace
356.0 KiB + 173.5 KiB = 529.5 KiB rtkit-daemon
788.0 KiB + 369.5 KiB = 1.1 MiB su
896.0 KiB + 536.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 367.5 KiB = 1.4 MiB sudo
1.1 MiB + 760.5 KiB = 1.9 MiB systemd-timesyncd
1.3 MiB + 836.5 KiB = 2.1 MiB systemd-logind
1.3 MiB + 871.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.9 MiB + 540.5 KiB = 2.4 MiB bluetoothd
4.0 MiB + 235.5 KiB = 4.2 MiB systemd-udevd
2.6 MiB + 1.6 MiB = 4.2 MiB bash (3)
3.1 MiB + 1.3 MiB = 4.4 MiB polkitd
4.1 MiB + 733.5 KiB = 4.9 MiB wpa_supplicant
2.6 MiB + 2.3 MiB = 4.9 MiB dhclient (2)
4.0 MiB + 5.0 MiB = 9.0 MiB systemd (3)
9.5 MiB + 1.4 MiB = 10.9 MiB NetworkManager
11.7 MiB + 723.5 KiB = 12.4 MiB systemd-journald
17.3 MiB + 1.8 MiB = 19.1 MiB pulseaudio
---------------------------------
89.6 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 376531 / 383503 (98,2%)
Active / Total Slabs (% used) : 8438 / 8438 (100,0%)
Active / Total Caches (% used) : 94 / 142 (66,2%)
Active / Total Size (% used) : 92820,45K / 95443,88K (97,3%)
Minimum / Average / Maximum Object : 0,01K / 0,25K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
21978 21568 98% 0,59K 814 27 13024K inode_cache
37170 34457 92% 0,19K 885 42 7080K dentry
3520 3520 100% 2,00K 220 16 7040K kmalloc-2k
1288 1272 98% 4,00K 161 8 5152K kmalloc-4k
4770 3996 83% 1,06K 159 30 5088K ext4_inode_cache
20826 20670 99% 0,20K 534 39 4272K vm_area_struct
32960 32960 100% 0,12K 1030 32 4120K kernfs_node_cache
3488 3488 100% 1,00K 109 32 3488K kmalloc-1k
13024 12848 98% 0,25K 407 32 3256K filp
4776 4615 96% 0,66K 199 24 3184K proc_inode_cache
4844 4130 85% 0,57K 173 28 2768K radix_tree_node
680 680 100% 3,75K 85 8 2720K task_struct
5120 5120 100% 0,50K 160 32 2560K kmalloc-5122) after exiting a game (1.7G used)
Code: total used free shared buff/cache available
Mem: 5944 1760 2541 1 1642 3944
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 2602836 kB
MemAvailable: 4039216 kB
Buffers: 73444 kB
Cached: 1558660 kB
SwapCached: 0 kB
Active: 695112 kB
Inactive: 978076 kB
Active(anon): 792 kB
Inactive(anon): 41620 kB
Active(file): 694320 kB
Inactive(file): 936456 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 37080 kB
Mapped: 58864 kB
Shmem: 1312 kB
KReclaimable: 49740 kB
Slab: 131000 kB
SReclaimable: 49740 kB
SUnreclaim: 81260 kB
KernelStack: 3040 kB
PageTables: 1528 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 241408 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27264 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 1897896 kB
DirectMap2M: 4325376 kB
DirectMap1G: 1048576 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 61.5 KiB = 205.5 KiB swapspace
356.0 KiB + 166.5 KiB = 522.5 KiB rtkit-daemon
788.0 KiB + 355.5 KiB = 1.1 MiB su
896.0 KiB + 508.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 333.5 KiB = 1.4 MiB sudo
1.1 MiB + 728.5 KiB = 1.8 MiB systemd-timesyncd
1.3 MiB + 804.5 KiB = 2.1 MiB systemd-logind
1.4 MiB + 857.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.8 MiB + 505.5 KiB = 2.3 MiB bluetoothd
3.0 MiB + 1.1 MiB = 4.0 MiB polkitd
4.0 MiB + 219.5 KiB = 4.2 MiB systemd-udevd
2.7 MiB + 1.6 MiB = 4.3 MiB bash (3)
4.1 MiB + 681.5 KiB = 4.8 MiB wpa_supplicant
2.6 MiB + 2.2 MiB = 4.8 MiB dhclient (2)
4.7 MiB + 1.4 MiB = 6.1 MiB udisksd
4.0 MiB + 4.9 MiB = 8.9 MiB systemd (3)
9.4 MiB + 1.1 MiB = 10.6 MiB NetworkManager
11.7 MiB + 693.5 KiB = 12.4 MiB systemd-journald
17.5 MiB + 1.7 MiB = 19.2 MiB pulseaudio
---------------------------------
94.5 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 439459 / 453680 (96,9%)
Active / Total Slabs (% used) : 10158 / 10158 (100,0%)
Active / Total Caches (% used) : 95 / 142 (66,9%)
Active / Total Size (% used) : 110972,32K / 115627,59K (96,0%)
Minimum / Average / Maximum Object : 0,01K / 0,25K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
21952 20652 94% 0,57K 784 28 12544K radix_tree_node
18090 17093 94% 0,59K 670 27 10720K inode_cache
8040 6970 86% 1,06K 268 30 8576K ext4_inode_cache
37968 32553 85% 0,19K 904 42 7232K dentry
3584 3584 100% 2,00K 224 16 7168K kmalloc-2k
1408 1398 99% 4,00K 176 8 5632K kmalloc-4k
23790 23678 99% 0,20K 610 39 4880K vm_area_struct
35488 35209 99% 0,12K 1109 32 4436K kernfs_node_cache
4352 4129 94% 1,00K 136 32 4352K kmalloc-1k
5568 5411 97% 0,66K 232 24 3712K proc_inode_cache
14208 14032 98% 0,25K 444 32 3552K filp
776 776 100% 3,75K 97 8 3104K task_struct
5728 5728 100% 0,50K 179 32 2864K kmalloc-5123) echo 1 > /proc/sys/vm/drop_caches # free pagecache (about the same 1.6G usage)
Code: total used free shared buff/cache available
Mem: 5944 1759 4085 1 100 4003
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 4183300 kB
MemAvailable: 4099392 kB
Buffers: 728 kB
Cached: 62388 kB
SwapCached: 0 kB
Active: 37504 kB
Inactive: 66616 kB
Active(anon): 904 kB
Inactive(anon): 41596 kB
Active(file): 36600 kB
Inactive(file): 25020 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 37152 kB
Mapped: 58720 kB
Shmem: 1312 kB
KReclaimable: 40164 kB
Slab: 121416 kB
SReclaimable: 40164 kB
SUnreclaim: 81252 kB
KernelStack: 3040 kB
PageTables: 1548 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 246760 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27232 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 1897896 kB
DirectMap2M: 4325376 kB
DirectMap1G: 1048576 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 61.5 KiB = 205.5 KiB swapspace
356.0 KiB + 166.5 KiB = 522.5 KiB rtkit-daemon
788.0 KiB + 360.5 KiB = 1.1 MiB su
896.0 KiB + 507.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 335.5 KiB = 1.4 MiB sudo
1.1 MiB + 728.5 KiB = 1.8 MiB systemd-timesyncd
1.3 MiB + 805.5 KiB = 2.1 MiB systemd-logind
1.4 MiB + 857.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.8 MiB + 506.5 KiB = 2.3 MiB bluetoothd
3.0 MiB + 1.1 MiB = 4.1 MiB polkitd
4.0 MiB + 218.5 KiB = 4.2 MiB systemd-udevd
2.7 MiB + 1.6 MiB = 4.2 MiB bash (3)
4.1 MiB + 690.5 KiB = 4.8 MiB wpa_supplicant
2.6 MiB + 2.2 MiB = 4.8 MiB dhclient (2)
4.7 MiB + 1.4 MiB = 6.1 MiB udisksd
4.0 MiB + 4.9 MiB = 8.9 MiB systemd (3)
9.4 MiB + 1.1 MiB = 10.6 MiB NetworkManager
11.7 MiB + 693.5 KiB = 12.4 MiB systemd-journald
17.5 MiB + 1.7 MiB = 19.2 MiB pulseaudio
---------------------------------
94.5 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 411472 / 427217 (96,3%)
Active / Total Slabs (% used) : 9322 / 9322 (100,0%)
Active / Total Caches (% used) : 95 / 142 (66,9%)
Active / Total Size (% used) : 100732,35K / 105776,20K (95,2%)
Minimum / Average / Maximum Object : 0,01K / 0,25K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
18090 17093 94% 0,59K 670 27 10720K inode_cache
8040 6976 86% 1,06K 268 30 8576K ext4_inode_cache
37968 32553 85% 0,19K 904 42 7232K dentry
3584 3584 100% 2,00K 224 16 7168K kmalloc-2k
1408 1377 97% 4,00K 176 8 5632K kmalloc-4k
22776 22632 99% 0,20K 584 39 4672K vm_area_struct
35456 35207 99% 0,12K 1108 32 4432K kernfs_node_cache
4352 4126 94% 1,00K 136 32 4352K kmalloc-1k
6916 5324 76% 0,57K 247 28 3952K radix_tree_node
5568 5411 97% 0,66K 232 24 3712K proc_inode_cache
14080 13904 98% 0,25K 440 32 3520K filp
776 776 100% 3,75K 97 8 3104K task_struct
5728 5728 100% 0,50K 179 32 2864K kmalloc-5124) echo 2 > /proc/sys/vm/drop_caches # free reclaimable slab objects (includes dentries and inodes) (back to normal 200M usage)
Code: total used free shared buff/cache available
Mem: 5944 204 5642 1 98 5559
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 5777624 kB
MemAvailable: 5692820 kB
Buffers: 3928 kB
Cached: 62752 kB
SwapCached: 0 kB
Active: 40840 kB
Inactive: 62992 kB
Active(anon): 928 kB
Inactive(anon): 37520 kB
Active(file): 39912 kB
Inactive(file): 25472 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 37164 kB
Mapped: 58752 kB
Shmem: 1312 kB
KReclaimable: 34616 kB
Slab: 115652 kB
SReclaimable: 34616 kB
SUnreclaim: 81036 kB
KernelStack: 3056 kB
PageTables: 1580 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 243244 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27248 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 1897896 kB
DirectMap2M: 4325376 kB
DirectMap1G: 1048576 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 60.5 KiB = 204.5 KiB swapspace
356.0 KiB + 166.5 KiB = 522.5 KiB rtkit-daemon
788.0 KiB + 360.5 KiB = 1.1 MiB su
896.0 KiB + 507.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 349.5 KiB = 1.4 MiB sudo
1.1 MiB + 728.5 KiB = 1.8 MiB systemd-timesyncd
1.3 MiB + 804.5 KiB = 2.1 MiB systemd-logind
1.4 MiB + 857.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.8 MiB + 506.5 KiB = 2.3 MiB bluetoothd
3.0 MiB + 1.1 MiB = 4.1 MiB polkitd
4.0 MiB + 218.5 KiB = 4.2 MiB systemd-udevd
2.6 MiB + 1.6 MiB = 4.2 MiB bash (3)
4.1 MiB + 682.5 KiB = 4.8 MiB wpa_supplicant
2.6 MiB + 2.2 MiB = 4.8 MiB dhclient (2)
4.7 MiB + 1.4 MiB = 6.1 MiB udisksd
4.0 MiB + 4.9 MiB = 8.9 MiB systemd (3)
9.4 MiB + 1.1 MiB = 10.6 MiB NetworkManager
11.7 MiB + 693.5 KiB = 12.4 MiB systemd-journald
17.5 MiB + 1.7 MiB = 19.2 MiB pulseaudio
---------------------------------
94.5 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 406745 / 418837 (97,1%)
Active / Total Slabs (% used) : 9088 / 9088 (100,0%)
Active / Total Caches (% used) : 95 / 142 (66,9%)
Active / Total Size (% used) : 96245,45K / 100299,09K (96,0%)
Minimum / Average / Maximum Object : 0,01K / 0,24K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
18090 17093 94% 0,59K 670 27 10720K inode_cache
3584 3584 100% 2,00K 224 16 7168K kmalloc-2k
35826 31569 88% 0,19K 853 42 6824K dentry
1408 1377 97% 4,00K 176 8 5632K kmalloc-4k
22776 22776 100% 0,20K 584 39 4672K vm_area_struct
35456 35207 99% 0,12K 1108 32 4432K kernfs_node_cache
4352 4126 94% 1,00K 136 32 4352K kmalloc-1k
3840 3184 82% 1,06K 128 30 4096K ext4_inode_cache
5568 5411 97% 0,66K 232 24 3712K proc_inode_cache
13984 13752 98% 0,25K 437 32 3496K filp
5852 4758 81% 0,57K 209 28 3344K radix_tree_node
776 776 100% 3,75K 97 8 3104K task_struct
5760 5760 100% 0,50K 180 32 2880K kmalloc-512
You can see 1.6G memory coming back from no where, after clearing kernel slabs.
* https://www.kernel.org/doc/Documentation/sysctl/vm.txt
* https://code.woboq.org/linux/linux/f..._caches.c.html
I'm trying to understand where my free memory goes. No, this is not about usual caches and buffers.
To clear the process I'm using clear linux machine after reboot, steps:
1) reboot into rescue mode
2) su user
Memory usage about 200M showed in htop and /proc/meminfo
Then I start a wine game:
3) startx ~/bin/game
Play it for a few moments and exit. Memory usage 1.6G after exiting the game and it stays used.
I'm trying to understand where this memory goes. But I do not see any trails. I able to clam back this memory by issuing:
echo 2 > /proc/sys/vm/drop_caches
But this does not explain who using it. I did compare /proc/meminfo before and after drop_caches. I see only significant change in MemAvailable (1.2G change) but everything else stays almost the same (nor slab, nor buffers, nor cached).
I did ran slabtop - same, nothing calming to have 1.2G of memory. Any suggestion how I can see kernel memory usage by module / type?
EDIT: simple script shows what is going on:
Code:#!/bin/bash
free -m
echo
echo "----- meminfo"
cat /proc/meminfo
echo
echo "----- ps_mem (https://github.com/pixelb/ps_mem)"
sudo ~/bin/ps_mem.py
echo
echo "----- dmesg info"
dmesg | grep Memory: | grep -E -o '[0-9]+K (kernel code|data|rwdata|rodata|init)' && awk '{print $2/1024 "K " $1 }' /proc/modules | sort -hr | head
echo
echo "----- slabtop"
sudo slabtop -s c -o | head -201) fresh reboot (200M used)
Code: total used free shared buff/cache available
Mem: 5944 189 5541 1 214 5522
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 5673864 kB
MemAvailable: 5654600 kB
Buffers: 36144 kB
Cached: 146924 kB
SwapCached: 0 kB
Active: 128120 kB
Inactive: 91760 kB
Active(anon): 37308 kB
Inactive(anon): 816 kB
Active(file): 90812 kB
Inactive(file): 90944 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 120 kB
Writeback: 0 kB
AnonPages: 34836 kB
Mapped: 55800 kB
Shmem: 1308 kB
KReclaimable: 36492 kB
Slab: 110228 kB
SReclaimable: 36492 kB
SUnreclaim: 73736 kB
KernelStack: 2944 kB
PageTables: 1392 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 197488 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27132 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 136616 kB
DirectMap2M: 3989504 kB
DirectMap1G: 3145728 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 63.5 KiB = 207.5 KiB swapspace
356.0 KiB + 173.5 KiB = 529.5 KiB rtkit-daemon
788.0 KiB + 369.5 KiB = 1.1 MiB su
896.0 KiB + 536.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 367.5 KiB = 1.4 MiB sudo
1.1 MiB + 760.5 KiB = 1.9 MiB systemd-timesyncd
1.3 MiB + 836.5 KiB = 2.1 MiB systemd-logind
1.3 MiB + 871.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.9 MiB + 540.5 KiB = 2.4 MiB bluetoothd
4.0 MiB + 235.5 KiB = 4.2 MiB systemd-udevd
2.6 MiB + 1.6 MiB = 4.2 MiB bash (3)
3.1 MiB + 1.3 MiB = 4.4 MiB polkitd
4.1 MiB + 733.5 KiB = 4.9 MiB wpa_supplicant
2.6 MiB + 2.3 MiB = 4.9 MiB dhclient (2)
4.0 MiB + 5.0 MiB = 9.0 MiB systemd (3)
9.5 MiB + 1.4 MiB = 10.9 MiB NetworkManager
11.7 MiB + 723.5 KiB = 12.4 MiB systemd-journald
17.3 MiB + 1.8 MiB = 19.1 MiB pulseaudio
---------------------------------
89.6 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 376531 / 383503 (98,2%)
Active / Total Slabs (% used) : 8438 / 8438 (100,0%)
Active / Total Caches (% used) : 94 / 142 (66,2%)
Active / Total Size (% used) : 92820,45K / 95443,88K (97,3%)
Minimum / Average / Maximum Object : 0,01K / 0,25K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
21978 21568 98% 0,59K 814 27 13024K inode_cache
37170 34457 92% 0,19K 885 42 7080K dentry
3520 3520 100% 2,00K 220 16 7040K kmalloc-2k
1288 1272 98% 4,00K 161 8 5152K kmalloc-4k
4770 3996 83% 1,06K 159 30 5088K ext4_inode_cache
20826 20670 99% 0,20K 534 39 4272K vm_area_struct
32960 32960 100% 0,12K 1030 32 4120K kernfs_node_cache
3488 3488 100% 1,00K 109 32 3488K kmalloc-1k
13024 12848 98% 0,25K 407 32 3256K filp
4776 4615 96% 0,66K 199 24 3184K proc_inode_cache
4844 4130 85% 0,57K 173 28 2768K radix_tree_node
680 680 100% 3,75K 85 8 2720K task_struct
5120 5120 100% 0,50K 160 32 2560K kmalloc-5122) after exiting a game (1.7G used)
Code: total used free shared buff/cache available
Mem: 5944 1760 2541 1 1642 3944
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 2602836 kB
MemAvailable: 4039216 kB
Buffers: 73444 kB
Cached: 1558660 kB
SwapCached: 0 kB
Active: 695112 kB
Inactive: 978076 kB
Active(anon): 792 kB
Inactive(anon): 41620 kB
Active(file): 694320 kB
Inactive(file): 936456 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 37080 kB
Mapped: 58864 kB
Shmem: 1312 kB
KReclaimable: 49740 kB
Slab: 131000 kB
SReclaimable: 49740 kB
SUnreclaim: 81260 kB
KernelStack: 3040 kB
PageTables: 1528 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 241408 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27264 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 1897896 kB
DirectMap2M: 4325376 kB
DirectMap1G: 1048576 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 61.5 KiB = 205.5 KiB swapspace
356.0 KiB + 166.5 KiB = 522.5 KiB rtkit-daemon
788.0 KiB + 355.5 KiB = 1.1 MiB su
896.0 KiB + 508.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 333.5 KiB = 1.4 MiB sudo
1.1 MiB + 728.5 KiB = 1.8 MiB systemd-timesyncd
1.3 MiB + 804.5 KiB = 2.1 MiB systemd-logind
1.4 MiB + 857.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.8 MiB + 505.5 KiB = 2.3 MiB bluetoothd
3.0 MiB + 1.1 MiB = 4.0 MiB polkitd
4.0 MiB + 219.5 KiB = 4.2 MiB systemd-udevd
2.7 MiB + 1.6 MiB = 4.3 MiB bash (3)
4.1 MiB + 681.5 KiB = 4.8 MiB wpa_supplicant
2.6 MiB + 2.2 MiB = 4.8 MiB dhclient (2)
4.7 MiB + 1.4 MiB = 6.1 MiB udisksd
4.0 MiB + 4.9 MiB = 8.9 MiB systemd (3)
9.4 MiB + 1.1 MiB = 10.6 MiB NetworkManager
11.7 MiB + 693.5 KiB = 12.4 MiB systemd-journald
17.5 MiB + 1.7 MiB = 19.2 MiB pulseaudio
---------------------------------
94.5 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 439459 / 453680 (96,9%)
Active / Total Slabs (% used) : 10158 / 10158 (100,0%)
Active / Total Caches (% used) : 95 / 142 (66,9%)
Active / Total Size (% used) : 110972,32K / 115627,59K (96,0%)
Minimum / Average / Maximum Object : 0,01K / 0,25K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
21952 20652 94% 0,57K 784 28 12544K radix_tree_node
18090 17093 94% 0,59K 670 27 10720K inode_cache
8040 6970 86% 1,06K 268 30 8576K ext4_inode_cache
37968 32553 85% 0,19K 904 42 7232K dentry
3584 3584 100% 2,00K 224 16 7168K kmalloc-2k
1408 1398 99% 4,00K 176 8 5632K kmalloc-4k
23790 23678 99% 0,20K 610 39 4880K vm_area_struct
35488 35209 99% 0,12K 1109 32 4436K kernfs_node_cache
4352 4129 94% 1,00K 136 32 4352K kmalloc-1k
5568 5411 97% 0,66K 232 24 3712K proc_inode_cache
14208 14032 98% 0,25K 444 32 3552K filp
776 776 100% 3,75K 97 8 3104K task_struct
5728 5728 100% 0,50K 179 32 2864K kmalloc-5123) echo 1 > /proc/sys/vm/drop_caches # free pagecache (about the same 1.6G usage)
Code: total used free shared buff/cache available
Mem: 5944 1759 4085 1 100 4003
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 4183300 kB
MemAvailable: 4099392 kB
Buffers: 728 kB
Cached: 62388 kB
SwapCached: 0 kB
Active: 37504 kB
Inactive: 66616 kB
Active(anon): 904 kB
Inactive(anon): 41596 kB
Active(file): 36600 kB
Inactive(file): 25020 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 37152 kB
Mapped: 58720 kB
Shmem: 1312 kB
KReclaimable: 40164 kB
Slab: 121416 kB
SReclaimable: 40164 kB
SUnreclaim: 81252 kB
KernelStack: 3040 kB
PageTables: 1548 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 246760 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27232 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 1897896 kB
DirectMap2M: 4325376 kB
DirectMap1G: 1048576 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 61.5 KiB = 205.5 KiB swapspace
356.0 KiB + 166.5 KiB = 522.5 KiB rtkit-daemon
788.0 KiB + 360.5 KiB = 1.1 MiB su
896.0 KiB + 507.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 335.5 KiB = 1.4 MiB sudo
1.1 MiB + 728.5 KiB = 1.8 MiB systemd-timesyncd
1.3 MiB + 805.5 KiB = 2.1 MiB systemd-logind
1.4 MiB + 857.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.8 MiB + 506.5 KiB = 2.3 MiB bluetoothd
3.0 MiB + 1.1 MiB = 4.1 MiB polkitd
4.0 MiB + 218.5 KiB = 4.2 MiB systemd-udevd
2.7 MiB + 1.6 MiB = 4.2 MiB bash (3)
4.1 MiB + 690.5 KiB = 4.8 MiB wpa_supplicant
2.6 MiB + 2.2 MiB = 4.8 MiB dhclient (2)
4.7 MiB + 1.4 MiB = 6.1 MiB udisksd
4.0 MiB + 4.9 MiB = 8.9 MiB systemd (3)
9.4 MiB + 1.1 MiB = 10.6 MiB NetworkManager
11.7 MiB + 693.5 KiB = 12.4 MiB systemd-journald
17.5 MiB + 1.7 MiB = 19.2 MiB pulseaudio
---------------------------------
94.5 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 411472 / 427217 (96,3%)
Active / Total Slabs (% used) : 9322 / 9322 (100,0%)
Active / Total Caches (% used) : 95 / 142 (66,9%)
Active / Total Size (% used) : 100732,35K / 105776,20K (95,2%)
Minimum / Average / Maximum Object : 0,01K / 0,25K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
18090 17093 94% 0,59K 670 27 10720K inode_cache
8040 6976 86% 1,06K 268 30 8576K ext4_inode_cache
37968 32553 85% 0,19K 904 42 7232K dentry
3584 3584 100% 2,00K 224 16 7168K kmalloc-2k
1408 1377 97% 4,00K 176 8 5632K kmalloc-4k
22776 22632 99% 0,20K 584 39 4672K vm_area_struct
35456 35207 99% 0,12K 1108 32 4432K kernfs_node_cache
4352 4126 94% 1,00K 136 32 4352K kmalloc-1k
6916 5324 76% 0,57K 247 28 3952K radix_tree_node
5568 5411 97% 0,66K 232 24 3712K proc_inode_cache
14080 13904 98% 0,25K 440 32 3520K filp
776 776 100% 3,75K 97 8 3104K task_struct
5728 5728 100% 0,50K 179 32 2864K kmalloc-5124) echo 2 > /proc/sys/vm/drop_caches # free reclaimable slab objects (includes dentries and inodes) (back to normal 200M usage)
Code: total used free shared buff/cache available
Mem: 5944 204 5642 1 98 5559
Swap: 3073 0 3073
----- meminfo
MemTotal: 6087576 kB
MemFree: 5777624 kB
MemAvailable: 5692820 kB
Buffers: 3928 kB
Cached: 62752 kB
SwapCached: 0 kB
Active: 40840 kB
Inactive: 62992 kB
Active(anon): 928 kB
Inactive(anon): 37520 kB
Active(file): 39912 kB
Inactive(file): 25472 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 3147660 kB
SwapFree: 3147660 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 37164 kB
Mapped: 58752 kB
Shmem: 1312 kB
KReclaimable: 34616 kB
Slab: 115652 kB
SReclaimable: 34616 kB
SUnreclaim: 81036 kB
KernelStack: 3056 kB
PageTables: 1580 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6191448 kB
Committed_AS: 243244 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 27248 kB
VmallocChunk: 0 kB
Percpu: 8640 kB
HardwareCorrupted: 0 kB
AnonHugePages: 2048 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: 1897896 kB
DirectMap2M: 4325376 kB
DirectMap1G: 1048576 kB
----- ps_mem
Private + Shared = RAM used Program
144.0 KiB + 60.5 KiB = 204.5 KiB swapspace
356.0 KiB + 166.5 KiB = 522.5 KiB rtkit-daemon
788.0 KiB + 360.5 KiB = 1.1 MiB su
896.0 KiB + 507.5 KiB = 1.4 MiB systemd-sulogin-shell
1.1 MiB + 349.5 KiB = 1.4 MiB sudo
1.1 MiB + 728.5 KiB = 1.8 MiB systemd-timesyncd
1.3 MiB + 804.5 KiB = 2.1 MiB systemd-logind
1.4 MiB + 857.0 KiB = 2.2 MiB dbus-daemon (2)
1.1 MiB + 1.2 MiB = 2.2 MiB alsactl
1.8 MiB + 506.5 KiB = 2.3 MiB bluetoothd
3.0 MiB + 1.1 MiB = 4.1 MiB polkitd
4.0 MiB + 218.5 KiB = 4.2 MiB systemd-udevd
2.6 MiB + 1.6 MiB = 4.2 MiB bash (3)
4.1 MiB + 682.5 KiB = 4.8 MiB wpa_supplicant
2.6 MiB + 2.2 MiB = 4.8 MiB dhclient (2)
4.7 MiB + 1.4 MiB = 6.1 MiB udisksd
4.0 MiB + 4.9 MiB = 8.9 MiB systemd (3)
9.4 MiB + 1.1 MiB = 10.6 MiB NetworkManager
11.7 MiB + 693.5 KiB = 12.4 MiB systemd-journald
17.5 MiB + 1.7 MiB = 19.2 MiB pulseaudio
---------------------------------
94.5 MiB
=================================
----- dmesg info
10243K kernel code
1210K rwdata
3984K rodata
1664K init
4892K amdgpu
1440K btrfs
856K mac80211
816K cfg80211
776K kvm
748K ext4
648K bluetooth
572K drm
360K aesni_intel
312K iwlmvm
----- slabtop
Active / Total Objects (% used) : 406745 / 418837 (97,1%)
Active / Total Slabs (% used) : 9088 / 9088 (100,0%)
Active / Total Caches (% used) : 95 / 142 (66,9%)
Active / Total Size (% used) : 96245,45K / 100299,09K (96,0%)
Minimum / Average / Maximum Object : 0,01K / 0,24K / 14,56K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
18090 17093 94% 0,59K 670 27 10720K inode_cache
3584 3584 100% 2,00K 224 16 7168K kmalloc-2k
35826 31569 88% 0,19K 853 42 6824K dentry
1408 1377 97% 4,00K 176 8 5632K kmalloc-4k
22776 22776 100% 0,20K 584 39 4672K vm_area_struct
35456 35207 99% 0,12K 1108 32 4432K kernfs_node_cache
4352 4126 94% 1,00K 136 32 4352K kmalloc-1k
3840 3184 82% 1,06K 128 30 4096K ext4_inode_cache
5568 5411 97% 0,66K 232 24 3712K proc_inode_cache
13984 13752 98% 0,25K 437 32 3496K filp
5852 4758 81% 0,57K 209 28 3344K radix_tree_node
776 776 100% 3,75K 97 8 3104K task_struct
5760 5760 100% 0,50K 180 32 2880K kmalloc-512
You can see 1.6G memory coming back from no where, after clearing kernel slabs.
* https://www.kernel.org/doc/Documentation/sysctl/vm.txt
* https://code.woboq.org/linux/linux/f..._caches.c.html