私は128MBのRAMを備えた組み込みLinuxシステム（kernel-5.24.0）を開発しています。
今、私はプロセスにメモリリーク（freeおよびavailable出力free -k）があることを発見し、リークがどこで発生するのかを調べようとしています。
それで、有名なものを使ってvalgrind --leak-check=yes --tool=memcheck myapp9時間実行した後、次の要約が得られました。
==6573== HEAP SUMMARY:
==6573== in use at exit: 34,793,251 bytes in 317,231 blocks
==6573== total heap usage: 50,635,131 allocs, 50,317,900 frees, 2,733,852,406 bytes allocated
....
==6573== LEAK SUMMARY:
==6573== definitely lost: 32 bytes in 2 blocks
==6573== indirectly lost: 0 bytes in 0 blocks
==6573== possibly lost: 318,088 bytes in 5,321 blocks
==6573== still reachable: 34,475,131 bytes in 311,908 blocks
==6573== suppressed: 0 bytes in 0 blocks
==6573== Reachable blocks (those to which a pointer was found) are not shown.
==6573== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==6573==
==6573== Use --track-origins=yes to see where uninitialised values come from
==6573== For lists of detected and suppressed errors, rerun with: -s
==6573== ERROR SUMMARY: 1893697 errors from 477 contexts (suppressed: 0 from 0)
と報告されるのにpossibly lost: 318,088 bytes合計が減少するfree -kのを見て（減少する個数が318,088バイトを超える）混乱します。freeAvailable
pmap -x pidof myappプロセスPSS合計（KB単位）がゆっくり増加していることがわかりましたDirty。[heap]
XXXXXXXXXXXXXXXXXXXXXXXXx 294
total used free shared buff/cache available
Mem: 117128 41792 49996 7956 25340 64772
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5060 5012 5012 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
XXXXXXXXXXXXXXXXXXXXXXXXx 295
total used free shared buff/cache available
Mem: 117128 41848 49940 7956 25340 64716
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5060 5012 5012 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
........
........
XXXXXXXXXXXXXXXXXXXXXXXXx 583
total used free shared buff/cache available
Mem: 117128 41940 49848 7956 25340 64624
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5192 5092 5092 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
XXXXXXXXXXXXXXXXXXXXXXXXx 584
total used free shared buff/cache available
Mem: 117128 41896 49892 7956 25340 64668
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5192 5092 5092 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
......
XXXXXXXXXXXXXXXXXXXXXXXXx 759
total used free shared buff/cache available
Mem: 117128 42028 49760 7956 25340 64536
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5192 5092 5092 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
XXXXXXXXXXXXXXXXXXXXXXXXx 760
total used free shared buff/cache available
Mem: 117128 41864 49924 7956 25340 64700
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5192 5092 5092 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
.......
.......
XXXXXXXXXXXXXXXXXXXXXXXXx 1000
total used free shared buff/cache available
Mem: 117128 41756 50032 7956 25340 64804
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5192 5092 5092 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
XXXXXXXXXXXXXXXXXXXXXXXXx 1001
total used free shared buff/cache available
Mem: 117128 41896 49892 7956 25340 64664
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5192 5116 5116 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
XXXXXXXXXXXXXXXXXXXXXXXXx 1002
total used free shared buff/cache available
Mem: 117128 41796 49992 7956 25340 64764
Swap: 0 0 0
1307: myapp
Address Kbytes PSS Dirty Swap Mode Mapping
0000000000400000 4 4 0 0 r-xp /usr/bin/myapp
0000000000410000 4 4 4 0 rwxp /usr/bin/myapp
0000000000c06000 5192 5116 5116 0 rwxp [heap]
000000007009f000 2208 2208 2208 0 rwxp [ anon ]
00000000703ad000 936 936 936 0 rwxp [ anon ]
0000000070497000 4 0 0 0 ---p [ anon ]
0000000070498000 8192 8 8 0 rwxp [ anon ]
0000000070c98000 4 0 0 0 ---p [ anon ]
私の場合、Valgrindのレポートは正しいですか？possibly lost理解でき、修正する価値がありますか？プロセスのメモリ使用量がmyapp増加する傾向です（量はキロバイト単位で変動しますが、傾向は増加しています）。メモリリークを識別するのに役立つ他の方法（またはvalgrindのツール）がありますか？
出力パターンとゆっくりとした増加で判断pmapすると、メモリ要求がどこから来るかを追跡するのに役立つ方法（ユーザースペースツールまたはカーネル機能）がありますか？PSSDirtymyapp