嵌入式Linux Yocto新版本内存异常：Active(anon)增量追踪求助

在相同硬件、近似软件环境下，对比旧版本（Yocto Morty）与新版本（Yocto Dunfell）的内存使用情况：

free命令输出对比 #

free for new version
              total        used        free      shared  buff/cache   available
Mem:          57568       41020        2036         324       14512       12520
Swap:             0           0           0
free for old version
              total        used        free      shared  buff/cache   available
Mem:          57496       34120        2588         284       20788       19516
Swap:             0           0           0

通过free命令可见，新版本的used内存增加了约7M，但执行ps axo pid,rss,cmd | awk '{sum+=$2} END {print sum }'统计所有进程RSS总和时，发现新版本（83652K）反而小于旧版本（124240K），且几乎每个进程的RSS都更小，这与预期不符。

于是通过cat /proc/meminfo获取更详细的内存信息，发现核心差异在于Active(anon)和AnonPages，新版本该部分内存增加了6M，但不清楚这6M内存的来源，求助如何追踪定位。

/proc/meminfo输出对比 #

新版本（Yocto Dunfell） #

MemTotal:          57568 kB
MemFree:            1460 kB
MemAvailable:      14752 kB
Buffers:             132 kB
Cached:            11760 kB
SwapCached:            0 kB
Active:            31456 kB
Inactive:           4044 kB
Active(anon):      23720 kB
Inactive(anon):      212 kB
Active(file):       7736 kB
Inactive(file):     3832 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                12 kB
Writeback:             0 kB
AnonPages:         23628 kB
Mapped:             6712 kB
Shmem:               324 kB
Slab:              10464 kB
SReclaimable:       5300 kB
SUnreclaim:         5164 kB
KernelStack:        1496 kB
PageTables:         1948 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:       28784 kB
Committed_AS:     651316 kB
VmallocTotal:     958464 kB
VmallocUsed:        1228 kB
VmallocChunk:     951436 kB

旧版本（Yocto Morty） #

MemTotal:          57496 kB
MemFree:            1996 kB
MemAvailable:      19172 kB
Buffers:             908 kB
Cached:            12092 kB
SwapCached:            0 kB
Active:            30168 kB
Inactive:            812 kB
Active(anon):      18048 kB
Inactive(anon):      216 kB
Active(file):      12120 kB
Inactive(file):      596 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                52 kB
Writeback:             0 kB
AnonPages:         17984 kB
Mapped:             5984 kB
Shmem:               284 kB
Slab:              14188 kB
SReclaimable:       8036 kB
SUnreclaim:         6152 kB
KernelStack:        1480 kB
PageTables:         2120 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:       28748 kB
Committed_AS:     649728 kB
VmallocTotal:     958464 kB
VmallocUsed:        1228 kB
VmallocChunk:     951556 kB

内容的提问来源于stack exchange，提问作者user303967