htop shows kernel_task used 25% of the memory on 8GB memory Macbook Air.
But the sum of the size column of kextstat is only 31830608. I think this number is in bytes? Why is there a difference in memory usage shown by htop and kextstat?
How to debug what threads take the most of the memory?
$ kextstat
Index Refs Address Size Wired Name (Version) UUID <Linked Against>
1 104 0xffffff7f80c00000 0x9e50 0x9e50 com.apple.kpi.bsd (18.2.0) CA649DFC-CCBE-4E4E-817B-1F57664865F2
2 10 0xffffff7f81103000 0x3900 0x3900 com.apple.kpi.dsep (18.2.0) 760FD540-C071-4813-9A6D-00A61BC66081
3 128 0xffffff7f80c2a000 0x21be0 0x21be0 com.apple.kpi.iokit (18.2.0) 189C1E43-7FD6-4C6B-9B4B-F4E10AD163FD
4 0 0xffffff7f834bb000 0x34b0 0x34b0 com.apple.kpi.kasan (18.2.0) 9D533FF0-5093-4DEC-B9FB-E1812C300F9D
5 134 0xffffff7f80c0a000 0xd7b0 0xd7b0 com.apple.kpi.libkern (18.2.0) 6395653A-7B06-45F4-A76B-28696B228B20
6 120 0xffffff7f80c18000 0x3f60 0x3f60 com.apple.kpi.mach (18.2.0) F52D843D-13A6-4347-BB48-01E0BC27CD8D
7 76 0xffffff7f80c1c000 0xd4c0 0xd4c0 com.apple.kpi.private (18.2.0) 804F8A0C-41CB-4BBF-A5E2-A3A77EB778C9
8 75 0xffffff7f80c8f000 0x5ea0 0x5ea0 com.apple.kpi.unsupported (18.2.0) B384D29D-4819-4D16-9209-97E046FD279D
9 9 0xffffff7f81107000 0xb5000 0xb5000 com.apple.kec.corecrypto (1.0) 47FE248D-DF8E-37C4-A3E0-331B39924822 <8 7 6 5 3 1>
10 2 0xffffff7f819e7000 0x10000 0x10000 com.apple.kec.Libm (1) 52E49F8C-857D-33BB-BEA7-A18B54C19969 <5>
11 0 0xffffff7f82aaa000 0xa000 0xa000 com.apple.kec.pthread (1) 773007A1-C7A7-3BC1-AEFF-783C4573D21F <8 7 6 5 3 1>
12 27 0xffffff7f81283000 0x9000 0x9000 com.apple.iokit.IOACPIFamily (1.4) DC1D9290-BFFC-309B-8529-CCB7AB322B1C <8 7 5 3>
13 35 0xffffff7f80c95000 0x35000 0x35000 com.apple.iokit.IOPCIFamily (2.9) 7DE930EC-AB73-3F5A-9D38-94D5EE90D197 <8 7 6 5 3>
14 7 0xffffff7f8128c000 0x1e000 0x1e000 com.apple.driver.AppleSMC (3.1.9) CE000030-3AC9-3E7E-8F53-9E8E34EE631A <13 12 8 7 6 5 3 1>
15 2 0xffffff7f82df9000 0x9c000 0x9c000 com.apple.driver.AppleACPIPlatform (6.1) A5254E14-670B-35BB-8E25-BD9872872275 <14 13 12 8 7 6 5 3 1>
16 9 0xffffff7f80ff5000 0x30000 0x30000 com.apple.iokit.IONetworkingFamily (3.4) A37DBC4E-D518-3B2B-8736-AE6B88C53D9C <8 7 6 5 3 1>
17 2 0xffffff7f8102c000 0x2d000 0x2d000 com.apple.iokit.IOTimeSyncFamily (700.7) 0B343114-5139-313E-B3CC-F91E7043ED4F <16 6 5 3 1>
18 6 0xffffff7f818b7000 0x7000 0x7000 com.apple.iokit.IOReportFamily (47) 6A9FF3E1-E644-3F33-8A44-8B51C44AA67C <6 5 3>
19 5 0xffffff7f819f7000 0x7000 0x7000 com.apple.driver.IOSlaveProcessor (1) A65C8CC0-7870-3A0A-A15A-B3DCB97526BE <5 3>
20 3 0xffffff7f83294000 0x18000 0x18000 com.apple.driver.AppleSEPManager (1.0.1) 6ABCCD04-3990-3BA0-9A65-90834B679925 <19 13 9 8 7 6 5 3 1>
21 1 0xffffff7f812ac000 0x8000 0x8000 com.apple.driver.AppleBusPowerController (1.0) A4F310BD-F588-34FF-A756-7D751A092119 <14 12 7 6 5 3>
22 7 0xffffff7f812b4000 0x8000 0x8000 com.apple.driver.usb.AppleUSBCommon (1.0) 3C048DDF-4E3F-3603-B95B-5580F5A93F06 <6 5 3 1>
23 15 0xffffff7f812bc000 0x7b000 0x7b000 com.apple.iokit.IOUSBHostFamily (1.2) 922E7520-229B-3C68-B232-A8727A20D44D <22 21 8 7 6 5 3 1>
24 3 0xffffff7f82759000 0x1d000 0x1d000 com.apple.driver.KernelRelayHost (1) 1A9D13CD-1AFE-3BCA-AD91-A9109E55FC29 <23 6 5 3>
25 1 0xffffff7f832c1000 0x3d000 0x3d000 com.apple.driver.AppleCredentialManager (1.0) 67CCF54F-7E44-3643-9E14-00384E048BEA <24 20 19 9 8 7 6 5 3 1>
26 9 0xffffff7f80fc1000 0x28000 0x28000 com.apple.iokit.IOStorageFamily (2.1) 3732B700-AB0F-3533-9C62-BD2D9DAAB979 <8 7 6 5 3 1>
27 4 0xffffff7f80c4c000 0x2b000 0x2b000 com.apple.iokit.IOSCSIArchitectureModelFamily (408.200.1) 42F4D8FD-E1EA-30F3-B1FD-2C92580DF6F1 <7 6 5 3 1>
28 2 0xffffff7f82ad1000 0x19000 0x19000 com.apple.iokit.IOSCSIBlockCommandsDevice (408.200.1) E080DC17-ECDC-35EC-B53F-A6B39ABA6A1C <27 26 7 6 5 3 1>
29 2 0xffffff7f82aee000 0x2d000 0x2d000 com.apple.iokit.IOUSBMassStorageDriver (145.200.2) 3565DEFA-2DBE-3BC4-9348-7F9C83A9858A <27 26 23 7 6 5 3 1>
30 1 0xffffff7f811bc000 0xa000 0xa000 com.apple.kext.CoreTrust (1) 1666BD0E-9415-3AE8-AB1B-830D5AF90006 <9 5>
31 6 0xffffff7f811c6000 0x1d000 0x1d000 com.apple.driver.AppleMobileFileIntegrity (1.0.5) 66A1BDE1-514B-3B0D-87DD-8E2B9F110A8C <30 9 8 7 6 5 3 2 1>
32 1 0xffffff7f82b22000 0x12000 0x12000 com.apple.driver.AppleUSBTDM (456.200.8) 74BF541E-86CA-365D-AC46-F7E5E3EE9B38 <31 29 28 27 26 23 8 7 6 5 3 1>
33 0 0xffffff7f832fe000 0x69000 0x69000 com.apple.driver.AppleKeyStore (2) 758D945E-E200-313D-AF0B-3055FD8C0AB1 <32 31 25 24 20 19 9 8 7 6 5 3 1>
34 2 0xffffff7f81818000 0xc000 0xc000 com.apple.driver.AppleEffaceableStorage (1.0) EAE26CBD-418E-3A0D-AAA2-1EA64F624934 <8 6 5 3 1>
35 0 0xffffff7f83393000 0xc000 0xc000 com.apple.driver.AppleFDEKeyStore (28.30) 29C1A3E4-A9C0-346D-9D25-35D6C64544F1 <34 9 8 7 6 5 3 1>
36 0 0xffffff7f83791000 0x19000 0x19000 com.apple.driver.DiskImages (493.0.0) 915578EF-4853-3DEB-83D3-6F450EB39D36 <26 8 7 6 5 3 1>
37 2 0xffffff7f81430000 0x5000 0x5000 com.apple.kext.AppleMatch (1.0.0d1) 71602467-B76C-37CE-84F4-D8A65A0AD05D <5 1>
38 1 0xffffff7f81435000 0x31000 0x31000 com.apple.security.sandbox (300.0) 82690C64-A0E2-302B-8E37-842CDF4A2A75 <37 31 26 8 7 6 5 3 2 1>
39 0 0xffffff7f818af000 0x8000 0x8000 com.apple.security.quarantine (3) D28C1B31-13CE-399F-B5D2-8C96E120D52B <38 37 8 7 6 5 2 1>
40 0 0xffffff7f8378e000 0x2000 0x2000 com.apple.security.TMSafetyNet (8) A2ECA7CA-9E69-3355-A297-B0935F0D02F0 <8 7 6 5 2 1>
41 0 0xffffff7f83883000 0x9000 0x9000 com.apple.nke.applicationfirewall (190) CB6761CD-ECBE-3DB6-B1E5-2B691968FA0C <8 7 6 5 3 1>
42 0 0xffffff7f838dc000 0x3000 0x3000 com.apple.driver.AppleAPIC (1.7) FBD2329A-0BC9-3665-8E53-29B7527B54B8 <13 5 3>
43 9 0xffffff7f811ef000 0x7e000 0x7e000 com.apple.iokit.IOHIDFamily (2.0.0) ECDBC8A9-D637-3FEE-BDA3-94025A03B709 <8 7 6 5 3 2 1>
44 3 0xffffff7f82ab4000 0x4000 0x4000 com.apple.iokit.IOSMBusFamily (1.1) BC6BE924-53E3-318A-A1B7-B896FA559717 <6 5 3>
45 0 0xffffff7f82e9e000 0x7000 0x7000 com.apple.driver.AppleACPIEC (6.1) BD7C0EE5-AC26-3DB1-BAFB-80A2B54F54D6 <44 43 18 15 12 8 7 6 5 3 1>
46 0 0xffffff7f83278000 0x4000 0x4000 com.apple.driver.AppleSMBIOS (2.1) 40F3E058-4E0D-3CB9-9E6A-8184CEC32140 <8 5 3>
47 0 0xffffff7f835a2000 0x3000 0x3000 com.apple.driver.AppleHPET (1.8) 784E4E15-3762-3886-9A11-33AF0A9810C1 <12 8 6 5 3>
48 0 0xffffff7f82ea8000 0x4000 0x4000 com.apple.driver.AppleACPIButtons (6.1) 537726C7-3FEE-3DB2-B6F6-36A1C6AE2927 <43 18 15 12 8 7 6 5 3 1>
49 0 0xffffff7f8274e000 0x8000 0x8000 com.apple.driver.AppleRTC (2.0) A7317204-C2D7-37C3-A113-1F828CA5EBA9 <12 8 6 5 3 1>
50 2 0xffffff7f81358000 0x5000 0x5000 com.apple.driver.AppleEFIRuntime (2.1) 25BD6FAC-7CD2-3006-BB3F-D3EF6B0C4B36 <8 7 6 5 3>
51 2 0xffffff7f8135d000 0xb000 0xb000 com.apple.driver.AppleEFINVRAM (2.1) E7F595DC-EE23-37F0-BE91-0C67758EA554 <50 8 7 6 5 3 1>
52 0 0xffffff7f82ab8000 0xb000 0xb000 com.apple.driver.AppleSmartBatteryManager (161.0.0) 3B467A8F-B4EB-3EED-B01A-4DEB584891E8 <44 12 6 5 3 1>
53 0 0xffffff7f816f9000 0x4000 0x4000 com.apple.driver.AppleUSBHostMergeProperties (1.2) 7ED08F8A-0A4C-3CBC-AAEA-9EC1909A2B59 <5 3 1>
54 0 0xffffff7f81368000 0x9b000 0x9b000 com.apple.iokit.IOUSBFamily (900.4.2) 102E3905-A575-3F55-A481-6D85E9334AEB <23 22 13 8 6 5 3 1>
55 0 0xffffff7f81757000 0x5000 0x5000 com.apple.driver.usb.AppleUSBHostPacketFilter (1.0) 821BD275-C5FC-377A-89C8-E1EB39C33F1D <23 22 8 7 6 5 3 1>
56 1 0xffffff7f81660000 0x55000 0x55000 com.apple.driver.usb.AppleUSBXHCI (1.2) 33335360-2A08-313F-AF2B-5A1D5A6300A0 <23 22 12 8 7 6 5 3 1>
57 0 0xffffff7f8175c000 0x2f000 0x2f000 com.apple.driver.usb.AppleUSBXHCIPCI (1.2) 04F18AD5-9687-38D8-A12E-BEC01B414281 <56 23 22 13 12 8 7 6 5 3 1>
59 1 0xffffff7f83221000 0xb000 0xb000 com.apple.driver.AppleIntelLpssGspi (3.0.60) A535A54E-6962-3DFA-B4E5-D8501D58A30A <13 12 8 6 5 3>
60 1 0xffffff7f8152e000 0x8000 0x8000 com.apple.driver.AppleIntelLpssDmac (3.0.60) 94F91CE7-C1CA-33C0-9E53-39A22137B961 <13 12 6 5 3>
61 1 0xffffff7f8322c000 0x14000 0x14000 com.apple.driver.AppleIntelLpssSpiController (3.0.60) 13FF93F6-B67D-3388-A833-5E7F967C4424 <60 59 12 6 5 3>
62 1 0xffffff7f83242000 0x16000 0x16000 com.apple.driver.AppleHSSPISupport (55) 05E38A2E-B65E-31A9-BD10-449A5F5AE0CE <61 12 6 5 3 1>
63 0 0xffffff7f8389f000 0x3000 0x3000 com.apple.private.KextAudit (1.0) 79EBD7E9-F048-319A-AA1B-9712DA17CC26 <14 8 7 6 5 3>
64 2 0xffffff7f81a1b000 0x29000 0x29000 com.apple.driver.corecapture (1.0.4) 5760B64C-3ACF-36C8-982C-166D79F1424F <8 7 6 5 3 1>
65 1 0xffffff7f81a4d000 0x8000 0x8000 com.apple.driver.mDNSOffloadUserClient (1.0.1b8) 4B2F0029-EEA7-31BD-B362-E92CE7324D4F <16 5 3 1>
66 1 0xffffff7f81a55000 0xfc000 0xfc000 com.apple.iokit.IO80211Family (1200.12.2) 7122958A-02DB-3FFB-B6AE-C0970D228F9D <64 31 16 9 8 7 6 5 3 1>
67 0 0xffffff7f81b5c000 0x7bd000 0x7bd000 com.apple.driver.AirPort.BrcmNIC (1400.1.1) 43CC7A5C-3C88-3AB4-A8E1-8CEB8576CB05 <66 65 64 16 13 8 7 6 5 3 1>
68 5 0xffffff7f82623000 0xec000 0xec000 com.apple.iokit.IOThunderboltFamily (6.8.1) 9C90F4A6-3131-3CBF-97ED-F455E6144CDA <6 5 3 1>
69 0 0xffffff7f838a4000 0x20000 0x20000 com.apple.driver.AppleThunderboltNHI (4.7.6) C79EE552-A3B6-3B82-A43A-0ABA270FE60C <68 13 12 7 6 5 3 1>
70 0 0xffffff7f832af000 0x5000 0x5000 com.apple.driver.AppleThunderboltPCIDownAdapter (2.1.4) 7BBB5B28-A07C-3E15-9CAA-B1B642A962E6 <68 13 6 5 3 1>
71 1 0xffffff7f8272e000 0xf000 0xf000 com.apple.driver.AppleThunderboltDPAdapterFamily (5.5.8) D7469734-F3B3-3418-AEF2-67A8E6779E7F <68 12 6 5 3 1>
72 0 0xffffff7f8273d000 0x6000 0x6000 com.apple.driver.AppleThunderboltDPInAdapter (5.5.8) 76E47BE9-9DBA-3A78-BFBC-D635D04BFA6A <71 68 6 5 3 1>
73 2 0xffffff7f82f32000 0x1a000 0x1a000 com.apple.iokit.IOAHCIFamily (288) 94FD66DE-F4D9-325B-B89F-535476BFE501 <6 5 3 1>
74 0 0xffffff7f8376b000 0x14000 0x14000 com.apple.driver.AppleAHCIPort (329.200.2) B9A44F9F-76B9-39E4-B9B2-9971356FCFEA <73 13 6 5 3 1>
75 0 0xffffff7f82f5c000 0x27000 0x27000 com.apple.iokit.IOAHCIBlockStorage (301.200.2) 7740112A-7D69-38B8-9275-F4BFBFFFD86D <73 51 26 7 6 5 3 1>
77 1 0xffffff7f818cf000 0x100000 0x100000 com.apple.filesystems.apfs (945.220.38) BE3143DE-BFA2-35A0-A155-D85D83B55242 <34 26 9 8 7 6 5 3 1>
79 0 0xffffff7f811e3000 0x8000 0x8000 com.apple.AppleSystemPolicy (1.0) 702BC815-3A9C-330E-A3CA-A7B5159F257D <31 8 7 6 5 3 2 1>
80 1 0xffffff7f81422000 0x8000 0x8000 com.apple.filesystems.hfs.encodings.kext (1) 7578D31E-FCD8-3760-8C50-0D0D9743D61D <8 7 6 5 3 1>
81 0 0xffffff7f814df000 0xd000 0xd000 com.apple.AppleFSCompression.AppleFSCompressionTypeZlib (1.0.0) AC9EE441-9A4C-3A7C-8B3E-33EB8AC16C77 <7 5 3 2 1>
82 0 0xffffff7f825e8000 0xe000 0xe000 com.apple.BootCache (40) 2C9E4BE4-59C6-336E-A3EA-A545E9F1DE3D <8 7 6 5 3 1>
83 0 0xffffff7f83264000 0x3000 0x3000 com.apple.AppleFSCompression.AppleFSCompressionTypeDataless (1.0.0d1) B2A80218-1505-3E31-9F72-ECA1DE80C44B <8 7 5 3 2 1>
84 1 0xffffff7f835a7000 0x69000 0x69000 com.apple.filesystems.hfs.kext (407.200.4) 2610E305-589A-3FAA-8B66-C198E5A838B3 <80 8 7 6 5 3 1>
85 2 0xffffff7f834e3000 0xe000 0xe000 com.apple.iokit.IOSerialFamily (11) BFCF0610-7F22-33EC-ABE0-2ED10CDD490F <8 7 6 5 3 1>
86 0 0xffffff7f837ea000 0x13000 0x13000 com.apple.driver.AppleVirtIO (2.0.9) D1C9646A-2B86-3D43-914C-20AF186B514A <85 26 13 6 5 3 1>
88 0 0xffffff7f8325b000 0x9000 0x9000 com.apple.driver.AppleHSSPIHIDDriver (55) 503D0D26-1D56-383E-8074-65A9EF8577BF <62 43 6 5 3 1>
89 0 0xffffff7f833d8000 0xb000 0xb000 com.apple.driver.AppleHIDKeyboard (208) D79556FE-5922-34D7-A0CD-E4D9EAE9DCFB <43 6 5 3>
90 1 0xffffff7f81a00000 0x17000 0x17000 com.apple.driver.AppleInputDeviceSupport (2410.2) 77D512B4-8C20-3F85-AAC7-1E369280DCA7 <19 6 5 3 1>
91 1 0xffffff7f825f8000 0x27000 0x27000 com.apple.driver.AppleMultitouchDriver (2410.5) 843EC1D8-9EF8-3957-A6DE-3BA2C75DA2EF <90 43 18 8 6 5 3 1>
92 5 0xffffff7f830df000 0xf6000 0xf6000 com.apple.iokit.IOBluetoothFamily (6.0.9f2) B346DC72-6C1D-3D18-AF53-243006DE8F60 <23 18 12 8 7 6 5 3 1>
93 1 0xffffff7f831ea000 0x1a000 0x1a000 com.apple.driver.IOBluetoothHIDDriver (6.0.9f2) C65C951F-5EA3-3567-888E-9426F9C6C9CE <92 43 6 5 3>
94 1 0xffffff7f833e7000 0xe000 0xe000 com.apple.driver.AppleHSBluetoothDriver (138.2) 0FB609EB-A6D5-31B5-9191-BBE7E108E0D6 <93 92 43 7 6 5 3 1>
95 0 0xffffff7f83408000 0xa000 0xa000 com.apple.driver.AppleTopCaseHIDEventDriver (138.2) DEB5AF27-6B55-3330-A457-5A171EE71B53 <94 91 43 7 6 5 3 1>
96 0 0xffffff7f8133f000 0x8000 0x8000 com.apple.driver.usb.AppleUSBHostCompositeDevice (1.2) 8C1845F2-B482-3839-AFBD-7615B63A966E <23 22 7 6 5 3 1>
97 0 0xffffff7f81513000 0x8000 0x8000 com.apple.driver.usb.networking (5.0.0) CCD5FEBF-603E-3954-93DC-5286ED1AE7C8 <23 7 6 5 3 1>
99 2 0xffffff7f8239e000 0xce000 0xce000 com.apple.vecLib.kext (1.2.0) D2378E7F-77C5-33C4-9DFB-44CEDA8978FF <10 7 6 5 3>
100 4 0xffffff7f8246c000 0x3f000 0x3f000 com.apple.iokit.IOAudioFamily (206.5) FC2441AE-A64B-39A6-8D27-16DA45778ABA <99 6 5 3 1>
103 0 0xffffff7f8383f000 0xd000 0xd000 com.apple.driver.AppleUSBCardReader (456.200.8) BF35B7EC-BB31-39AA-A238-C248EC1F84B7 <29 28 27 26 23 6 5 3 1>
106 0 0xffffff7f816bc000 0x35000 0x35000 com.apple.driver.usb.AppleUSBHub (1.2) 6011B60F-66A2-3D6E-B947-D854B7573C14 <23 22 12 6 5 3 1>
109 2 0xffffff7f834f4000 0xb000 0xb000 com.apple.iokit.IOBluetoothHostControllerTransport (6.0.9f2) 09AC3436-48F6-3003-82D2-371ACDD1E4F8 <92 23 13 12 8 7 6 5 3 1>
110 1 0xffffff7f83506000 0x20000 0x20000 com.apple.iokit.IOBluetoothHostControllerUSBTransport (6.0.9f2) 045D949C-F523-382B-BF9E-3E76EB36EED0 <109 92 23 13 12 8 7 6 5 3 1>
111 0 0xffffff7f83526000 0xc000 0xc000 com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport (6.0.9f2) 5A700044-E9EF-3F04-8372-F8802DE5BD4A <110 109 92 23 13 12 8 7 6 5 3>
112 15 0xffffff7f81466000 0x4b000 0x4b000 com.apple.iokit.IOGraphicsFamily (530.12) 9D1E5FA7-267E-397E-9C91-1751221A05CF <13 8 6 5 3 1>
113 0 0xffffff7f838ee000 0x5000 0x5000 com.apple.driver.AppleSMCLMU (212) C98DA56E-747A-36CE-9E12-F69D9C921A34 <112 14 6 5 3>
114 0 0xffffff7f8346a000 0x4000 0x4000 com.apple.driver.AppleOSXWatchdog (1) D4512DAB-736E-3D89-8BFD-1A8DCCA652BD <13 8 7 6 5 3 1>
118 1 0xffffff7f83546000 0xe000 0xe000 com.apple.driver.AppleSMBusController (1.0.18d1) 94B0E3A1-1A19-34C4-BCD0-DB97AF011A27 <44 13 12 6 5 3>
119 0 0xffffff7f83557000 0xf000 0xf000 com.apple.driver.AppleMCCSControl (1.5.6) F7C24EF2-BD7F-3074-941B-1AA5485D465C <118 112 14 13 12 8 6 5 3 1>
120 1 0xffffff7f814be000 0x5000 0x5000 com.apple.iokit.IOSlowAdaptiveClockingFamily (1.0.0) 3B87A06D-D6A2-3DB8-B093-A4B91EFCA4D2 <8 7 6 5 3 1>
121 0 0xffffff7f834db000 0x2000 0x2000 com.apple.driver.AppleIntelSlowAdaptiveClocking (4.0.0) DBB6E586-748A-39E2-BC59-9748D8E395A2 <120 5 3>
123 2 0xffffff7f82b47000 0x22000 0x22000 com.apple.iokit.IOSurface (255.1) B153C6D6-2542-3D6F-A21F-B56D9E1349DF <8 7 6 5 3 1>
124 2 0xffffff7f82b6b000 0xa5000 0xa5000 com.apple.iokit.IOAcceleratorFamily2 (400.27) 5BC3E111-E908-36E8-9AFB-A39BD0D561D5 <123 112 31 18 13 8 7 6 5 3 1>
125 4 0xffffff7f81824000 0x9000 0x9000 com.apple.AppleGraphicsDeviceControl (3.25.6) 53E6D711-F2EF-35EE-8974-7BDCE4281C83 <112 13 8 7 6 5 3 1>
126 0 0xffffff7f82c20000 0x195000 0x195000 com.apple.driver.AppleIntelBDWGraphicsFramebuffer (12.0.2) FFF38028-F575-301D-8B12-7713A1A39A02 <125 124 112 18 13 12 8 7 6 5 3 1>
127 0 0xffffff7f81552000 0xa8000 0xa8000 com.apple.driver.AppleCameraInterface (6.8.0) 2B835CCE-DBF5-3C79-8950-54063C24231C <13 8 7 6 5 3 1>
128 2 0xffffff7f82779000 0xc000 0xc000 com.apple.iokit.IOHDAFamily (282.10) 917C1366-DF57-3FE5-A81C-D1111AB3DA4E <6 5 3 1>
129 1 0xffffff7f82788000 0x1d000 0x1d000 com.apple.driver.AppleHDAController (282.10) 41CE33FB-FED7-36D3-A3DF-03B036329B10 <128 112 100 13 8 7 6 5 3 1>
130 0 0xffffff7f82eb0000 0x16000 0x16000 com.apple.driver.AppleThunderboltIP (3.1.2) 3A00083A-3BA9-3C54-A5B8-35CCD7D29FA5 <68 16 13 6 5 3 1>
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Best Answer
There's a difference between the two as they are two completely different things. It would not make sense to compare them or expect that they should be equal.
The Size column in your kextstat output shows much memory the kernel extension itself takes up in memory. This is the amount of the memory that the code/data in the kernel extension itself takes up (i.e. comparable to the binary file size of the kernel extension). It doesn't have anything to do with how much memory the kernel extension has used. Kernel extensions can dynamically allocate memory while running, and it doesn't show up in the Size column here, as it is a different thing.
The kernel_task memory usage shown is htop shows the actual memory usage of the kernel - this includes dynamically allocated memory. It can include memory used for the kernel itself, kernel extensions or memory allocated by the kernel on behalf of applications.
UPDATE: You have updated your question to ask a completely different question - namely "How to debug what threads take the most of the memory?".
This seems to indicate to me that this is a X/Y-question - you probably have some root issue you want to solve, and somehow you've come down a path where it makes sense for you to ask this question. However, the question doesn't really make much sense in technical terms, so it is difficult to actually help you without details on the actual problem you're trying to solve.
Technically, you cannot in general separate memory usage for each thread in a task like you want to do here. The very definition of threads (in this case, and almost always in other cases) is that they share memory with other threads. Therefore several threads inside a task could be using the same memory - and one thread can allocate memory that is used by a second thread that is eventually deallocated by a third thread. There exists a special class of memory named "thread local storage" which is really separate for each thread, but this construct is not commonly used in the macOS kernel (or in kernels in general).
Obviously you could instrument the kernel to log each allocation of memory and noting which thread did the allocation - but it wouldn't allow you to directly conclude that any "bug" is actually in that thread or anything like that.
By reading your question and various comments, you original problem sounds like you think your system is using too much memory, and you think a kernel extension is the culprit, but you do not know which one. These assumptions might be wrong (also on your part, as it is very common for non-technical people to have wrong assumptions on how memory allocation in computers actually work today).
In any case, I think the tool you might be looking for is simply zprint. Start Terminal.app and run:
This will print the total size of allocations created in each zone sorted by the sum.
This won't tell you which thread uses the most memory (obviously), but it is probably the values you're actually looking for.