I have two MacBooks, one with a fresh OS X install and one with an older install. The older one has a kernel_task taking 1.52 GB of RAM. The newer one—416 MB. These aren't identical machines or anything, but I am curious about the magnitude of the discrepancy and what contributes to it. Is there any way to inspect what comprises the kernel_task footprint, ideally without needing to experimentally uninstall various applications/services at a time?
I did try:
$ kextstat
Index Refs Address Size Wired Name (Version) <Linked Against>
1 77 0xffffff7f80757000 0x686c 0x686c com.apple.kpi.bsd (12.6.0)
2 6 0xffffff7f80742000 0x46c 0x46c com.apple.kpi.dsep (12.6.0)
3 101 0xffffff7f80761000 0x1b7ec 0x1b7ec com.apple.kpi.iokit (12.6.0)
4 107 0xffffff7f8074d000 0x99f8 0x99f8 com.apple.kpi.libkern (12.6.0)
5 94 0xffffff7f80743000 0x88c 0x88c com.apple.kpi.mach (12.6.0)
6 41 0xffffff7f80744000 0x502c 0x502c com.apple.kpi.private (12.6.0)
7 64 0xffffff7f8074a000 0x23cc 0x23cc com.apple.kpi.unsupported (12.6.0)
8 0 0xffffff7f814b2000 0x41000 0x41000 com.apple.kec.corecrypto (1.0) <7 6 5 4 3 1>
9 22 0xffffff7f807f3000 0x9000 0x9000 com.apple.iokit.IOACPIFamily (1.4) <7 6 4 3>
10 31 0xffffff7f808b2000 0x29000 0x29000 com.apple.iokit.IOPCIFamily (2.8) <7 6 5 4 3>
11 2 0xffffff7f81e79000 0x5a000 0x5a000 com.apple.driver.AppleACPIPlatform (1.8) <10 9 7 6 5 4 3 1>
12 1 0xffffff7f80acf000 0xe000 0xe000 com.apple.driver.AppleKeyStore (28.21) <7 6 5 4 3 1>
13 5 0xffffff7f8077d000 0x25000 0x25000 com.apple.iokit.IOStorageFamily (1.8) <7 6 5 4 3 1>
14 0 0xffffff7f80e1b000 0x19000 0x19000 com.apple.driver.DiskImages (345) <13 7 6 5 4 3 1>
15 0 0xffffff7f81b60000 0x2e000 0x2e000 com.apple.driver.AppleIntelCPUPowerManagement (214.0.0) <7 6 5 4 3 1>
16 0 0xffffff7f8075e000 0x3000 0x3000 com.apple.security.TMSafetyNet (7) <7 6 5 4 2 1>
17 2 0xffffff7f80854000 0x4000 0x4000 com.apple.kext.AppleMatch (1.0.0d1) <4 1>
18 1 0xffffff7f80858000 0x11000 0x11000 com.apple.security.sandbox (220.4) <17 7 6 5 4 3 2 1>
19 0 0xffffff7f80869000 0x6000 0x6000 com.apple.security.quarantine (2.1) <18 17 7 6 5 4 2 1>
20 0 0xffffff7f81eea000 0x8000 0x8000 com.apple.nke.applicationfirewall (4.0.39) <7 6 5 4 3 1>
21 0 0xffffff7f81e4d000 0x3000 0x3000 com.apple.driver.AppleAPIC (1.7) <4 3>
22 3 0xffffff7f80d05000 0x4000 0x4000 com.apple.iokit.IOSMBusFamily (1.1) <5 4 3>
23 0 0xffffff7f81ed9000 0x7000 0x7000 com.apple.driver.AppleACPIEC (1.8) <22 11 9 5 4 3>
24 0 0xffffff7f81925000 0x4000 0x4000 com.apple.driver.AppleSMBIOS (1.9) <7 4 3>
25 0 0xffffff7f81bb0000 0x3000 0x3000 com.apple.driver.AppleHPET (1.8) <9 7 5 4 3>
26 6 0xffffff7f80add000 0x6d000 0x6d000 com.apple.iokit.IOHIDFamily (1.8.1) <12 7 6 5 4 3 2 1>
27 0 0xffffff7f81ee3000 0x4000 0x4000 com.apple.driver.AppleACPIButtons (1.8) <26 11 9 7 6 5 4 3 1>
28 0 0xffffff7f81951000 0x8000 0x8000 com.apple.driver.AppleRTC (1.5) <9 5 4 3 1>
29 1 0xffffff7f81e20000 0x5000 0x5000 com.apple.driver.AppleEFIRuntime (2.0) <7 6 5 4 3>
30 0 0xffffff7f8192b000 0x8000 0x8000 com.apple.driver.AppleSmartBatteryManager (161.0.0) <22 9 5 4 3 1>
31 0 0xffffff7f81e25000 0xa000 0xa000 com.apple.driver.AppleEFINVRAM (2.0) <29 7 6 5 4 3>
32 0 0xffffff7f81b5b000 0x3000 0x3000 com.apple.driver.AppleIntelCPUPowerManagementClient (214.0.0) <7 6 5 4 3 1>
33 15 0xffffff7f80a4e000 0x5e000 0x5e000 com.apple.iokit.IOUSBFamily (635.4.0) <10 7 5 4 3 1>
34 0 0xffffff7f80be7000 0x18000 0x18000 com.apple.driver.AppleUSBEHCI (621.4.6) <33 10 7 5 4 3 1>
35 0 0xffffff7f80b6d000 0x1d000 0x1d000 com.apple.driver.AppleUSBXHCI (635.4.0) <33 10 7 5 4 3 1>
36 2 0xffffff7f81024000 0x16000 0x16000 com.apple.iokit.IOAHCIFamily (2.5.1) <5 4 3 1>
37 0 0xffffff7f81e52000 0x1a000 0x1a000 com.apple.driver.AppleAHCIPort (2.6.6) <36 10 5 4 3 1>
38 0 0xffffff7f81938000 0x12000 0x12000 com.apple.driver.AppleSDXC (1.4.3) <13 10 5 4 3 1>
39 3 0xffffff7f80a0f000 0x2b000 0x2b000 com.apple.iokit.IONetworkingFamily (3.0) <7 6 5 4 3 1>
40 1 0xffffff7f8106e000 0x68000 0x68000 com.apple.iokit.IO80211Family (530.5) <39 7 6 5 4 3 1>
41 0 0xffffff7f810dd000 0x1f9000 0x1f9000 com.apple.driver.AirPort.Brcm4331 (615.20.17) <40 39 10 7 5 4 3 1>
42 1 0xffffff7f80acc000 0x3000 0x3000 com.apple.iokit.IOUSBUserClient (630.4.4) <33 7 5 4 3 1>
43 0 0xffffff7f80bcb000 0x15000 0x15000 com.apple.driver.AppleUSBHub (635.4.0) <33 5 4 3 1>
44 4 0xffffff7f80c1c000 0xbb000 0xbb000 com.apple.iokit.IOThunderboltFamily (2.7.7) <5 4 3 1>
45 0 0xffffff7f81863000 0x16000 0x16000 com.apple.driver.AppleThunderboltNHI (1.9.2) <44 10 9 5 4 3 1>
46 0 0xffffff7f8104a000 0x17000 0x17000 com.apple.iokit.IOAHCIBlockStorage (2.3.5) <36 13 6 5 4 3 1>
47 0 0xffffff7f817a6000 0x3000 0x3000 com.apple.driver.XsanFilter (404) <13 5 4 3 1>
48 0 0xffffff7f81502000 0x9000 0x9000 com.apple.BootCache (34) <7 6 5 4 3 1>
49 0 0xffffff7f81e11000 0x4000 0x4000 com.apple.AppleFSCompression.AppleFSCompressionTypeZlib (1.0.0d1) <6 4 3 2 1>
50 0 0xffffff7f81e17000 0x3000 0x3000 com.apple.AppleFSCompression.AppleFSCompressionTypeDataless (1.0.0d1) <7 6 4 3 2 1>
52 1 0xffffff7f80b66000 0x7000 0x7000 com.apple.driver.AppleUSBComposite (621.4.0) <33 4 3 1>
53 0 0xffffff7f813cf000 0xc4000 0xc4000 com.apple.driver.CoreStorage (296.18.2) <13 7 6 5 4 3 1>
54 0 0xffffff7f80bc4000 0x7000 0x7000 com.apple.driver.AppleUSBMergeNub (621.4.6) <52 33 4 3 1>
56 3 0xffffff7f80b5d000 0x9000 0x9000 com.apple.iokit.IOUSBHIDDriver (623.4.0) <33 26 5 4 3 1>
57 0 0xffffff7f817da000 0x4000 0x4000 com.apple.driver.AppleUSBTCKeyboard (237.1) <56 33 26 7 6 5 4 3 1>
59 0 0xffffff7f817e5000 0x13000 0x13000 com.apple.driver.AppleUSBMultitouch (237.3) <56 33 26 6 5 4 3 1>
60 0 0xffffff7f81855000 0x5000 0x5000 com.apple.driver.AppleThunderboltPCIDownAdapter (1.3.2) <44 10 5 4 3>
61 1 0xffffff7f8187d000 0x9000 0x9000 com.apple.driver.AppleThunderboltDPAdapterFamily (2.5.0) <44 10 9 5 4 3>
62 0 0xffffff7f81886000 0x6000 0x6000 com.apple.driver.AppleThunderboltDPInAdapter (2.5.0) <61 44 10 9 5 4 3>
63 0 0xffffff7f817e0000 0x3000 0x3000 com.apple.driver.AppleUSBTCButtons (237.1) <56 33 26 7 6 5 4 3 1>
64 15 0xffffff7f80dc4000 0x38000 0x38000 com.apple.iokit.IOGraphicsFamily (2.3.7) <10 7 5 4 3>
65 2 0xffffff7f81914000 0xe000 0xe000 com.apple.driver.AppleSMBusController (1.0.11d1) <22 10 9 5 4 3>
66 0 0xffffff7f819bb000 0xd000 0xd000 com.apple.driver.AppleMCCSControl (1.1.11) <65 64 10 9 7 5 4 3 1>
67 8 0xffffff7f80e07000 0x12000 0x12000 com.apple.iokit.IONDRVSupport (2.3.7) <64 10 7 5 4 3>
68 1 0xffffff7f81df1000 0x5000 0x5000 com.apple.driver.AppleBacklightExpert (1.0.4) <67 64 10 5 4 3>
69 0 0xffffff7f81e45000 0x5000 0x5000 com.apple.driver.AppleBacklight (170.3.5) <68 67 64 10 5 4 3>
70 2 0xffffff7f81be1000 0xc000 0xc000 com.apple.iokit.IOHDAFamily (2.4.7fc4) <5 4 3 1>
71 1 0xffffff7f81c18000 0x19000 0x19000 com.apple.driver.AppleHDAController (2.4.7fc4) <70 64 10 7 6 5 4 3 1>
72 0 0xffffff7f81ae6000 0x61000 0x61000 com.apple.driver.AppleIntelFramebufferCapri (8.1.6) <64 10 9 7 6 5 4 3 1>
73 5 0xffffff7f80d74000 0xa000 0xa000 com.apple.driver.IOPlatformPluginFamily (5.4.1d13) <9 7 6 5 4 3>
74 5 0xffffff7f807fc000 0xf000 0xf000 com.apple.driver.AppleSMC (3.1.5d4) <9 7 5 4 3>
75 1 0xffffff7f80d7e000 0xe000 0xe000 com.apple.driver.X86PlatformPlugin (1.0.0) <74 73 33 9 7 6 5 4 3 1>
78 1 0xffffff7f81ddd000 0x3000 0x3000 com.apple.driver.AppleGraphicsControl (3.4.5) <67 64 10 9 7 5 4 3 1>
79 0 0xffffff7f81de0000 0xc000 0xc000 com.apple.driver.ApplePolicyControl (3.4.5) <78 67 64 10 9 7 5 4 3 1>
80 0 0xffffff7f813c9000 0x5000 0x5000 com.apple.Dont_Steal_Mac_OS_X (7.0.0) <74 7 4 3 1>
81 2 0xffffff7f80efb000 0x9a000 0x9a000 com.apple.iokit.IOBluetoothFamily (4.1.7f5) <33 7 5 4 3 1>
82 0 0xffffff7f80cf1000 0x12000 0x12000 com.apple.iokit.IOSurface (86.0.4) <7 5 4 3 1>
83 1 0xffffff7f81a27000 0x4b000 0x4b000 com.apple.iokit.IOAcceleratorFamily (74.18) <67 64 10 7 5 4 3 1>
84 0 0xffffff7f81a7d000 0x49000 0x49000 com.apple.driver.AppleIntelHD4000Graphics (8.1.6) <83 67 64 10 7 5 4 3 1>
85 0 0xffffff7f80d94000 0x3000 0x3000 com.apple.driver.AppleSMCPDRC (1.0.0) <73 10 6 4 3>
87 0 0xffffff7f80a41000 0x7000 0x7000 com.apple.iokit.IOUserEthernet (1.0.0d1) <39 6 5 4 3 1>
88 2 0xffffff7f80eb6000 0xe000 0xe000 com.apple.kext.OSvKernDSPLib (1.12) <5 4>
89 5 0xffffff7f80ec4000 0x2f000 0x2f000 com.apple.iokit.IOAudioFamily (1.9.2fc7) <88 5 4 3 1>
90 1 0xffffff7f81c31000 0xba000 0xba000 com.apple.driver.DspFuncLib (2.4.7fc4) <89 88 6 5 4 3 1>
91 0 0xffffff7f81cf4000 0x8b000 0x8b000 com.apple.driver.AppleHDA (2.4.7fc4) <90 89 71 70 67 64 6 5 4 3 1>
94 0 0xffffff7f8080d000 0x7000 0x7000 com.apple.driver.SMCMotionSensor (3.0.3d1) <74 5 4 3>
95 0 0xffffff7f81911000 0x2000 0x2000 com.apple.driver.AppleSMBusPCI (1.0.11d1) <10 5 4 3>
96 0 0xffffff7f819f2000 0x3000 0x3000 com.apple.driver.AppleLPC (1.6.3) <73 10 5 4 3>
97 0 0xffffff7f81bf0000 0x16000 0x16000 com.apple.driver.AppleMikeyDriver (2.4.7fc4) <65 9 5 4 3 1>
98 1 0xffffff7f80fca000 0x1b000 0x1b000 com.apple.iokit.IOBluetoothHostControllerUSBTransport (4.1.7f5) <33 10 9 7 5 4 3 1>
99 0 0xffffff7f80fe5000 0x8000 0x8000 com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport (4.1.7f5) <98 33 10 9 7 5 4 3>
102 0 0xffffff7f817fb000 0x5000 0x5000 com.apple.driver.AppleUpstreamUserClient (3.5.12) <64 10 9 7 5 4 3 1>
103 0 0xffffff7f81909000 0x5000 0x5000 com.apple.driver.AppleSMCLMU (2.0.3d0) <74 64 5 4 3>
104 0 0xffffff7f819b0000 0x3000 0x3000 com.apple.driver.AppleMikeyHIDDriver (124) <26 7 4 3 1>
105 1 0xffffff7f80d0e000 0xe000 0xe000 com.apple.iokit.IOSerialFamily (10.0.6) <7 6 5 4 3 1>
106 0 0xffffff7f80ea6000 0xa000 0xa000 com.apple.iokit.IOBluetoothSerialManager (4.1.7f5) <105 7 5 4 3 1>
107 0 0xffffff7f80fb5000 0x9000 0x9000 com.apple.driver.IOBluetoothA2DPAudioDriver (4.1.7f5) <89 81 5 4 3 1>
108 0 0xffffff7f80fa4000 0xa000 0xa000 com.apple.driver.IOBluetoothSCOAudioDriver (4.1.7f5) <89 81 5 4 3>
109 0 0xffffff7f81518000 0x5000 0x5000 com.apple.driver.AudioAUUC (1.60) <89 64 10 9 7 5 4 3 1>
110 0 0xffffff7f80d8c000 0x6000 0x6000 com.apple.driver.X86PlatformShim (1.0.0) <75 74 73 7 4 3>
111 0 0xffffff7f81dc3000 0x12000 0x12000 com.apple.driver.AGPM (100.13.14) <73 67 64 10 5 4 3>
112 0 0xffffff7f819a9000 0x4000 0x4000 com.apple.driver.ApplePlatformEnabler (2.0.7d2) <7 5 4 3>
113 0 0xffffff7f80870000 0x2b000 0x2b000 com.apple.iokit.IOSCSIArchitectureModelFamily (3.5.6) <5 4 3 1>
114 0 0xffffff7f81f07000 0x12000 0x12000 com.intel.kext.intelhaxm (1.1.1) <7 5 4 3 1>
115 2 0xffffff7f80817000 0x5000 0x5000 com.apple.kext.triggers (1.0) <7 6 5 4 3 1>
116 0 0xffffff7f8150d000 0x9000 0x9000 com.apple.filesystems.autofs (3.0) <115 7 6 5 4 3 1>
117 3 0xffffff7f81f19000 0x58000 0x58000 org.virtualbox.kext.VBoxDrv (4.3.22) <7 5 4 3 1>
118 0 0xffffff7f81f71000 0x8000 0x8000 org.virtualbox.kext.VBoxUSB (4.3.22) <117 42 33 7 5 4 3 1>
119 0 0xffffff7f81f79000 0x5000 0x5000 org.virtualbox.kext.VBoxNetFlt (4.3.22) <117 7 5 4 3 1>
120 0 0xffffff7f81f7e000 0x6000 0x6000 org.virtualbox.kext.VBoxNetAdp (4.3.22) <117 5 4 1>
124 0 0xffffff7f81f8d000 0xd000 0xd000 com.apple.nke.asp_tcp (7.1.0) <7 6 5 4 3 1>
125 1 0xffffff7f81f9a000 0x11000 0x11000 com.apple.security.SecureRemotePassword (1.0) <4 1>
126 0 0xffffff7f81fab000 0x4f000 0x4f000 com.apple.filesystems.afpfs (10.0) <125 7 6 5 4 3 1>
127 0 0xffffff7f81ffa000 0x33000 0x33000 com.apple.filesystems.smbfs (1.8.4) <115 7 6 5 4 3 1>
$ kextstat | grep -v com.apple
Index Refs Address Size Wired Name (Version) <Linked Against>
114 0 0xffffff7f81f07000 0x12000 0x12000 com.intel.kext.intelhaxm (1.1.1) <7 5 4 3 1>
117 3 0xffffff7f81f19000 0x58000 0x58000 org.virtualbox.kext.VBoxDrv (4.3.22) <7 5 4 3 1>
118 0 0xffffff7f81f71000 0x8000 0x8000 org.virtualbox.kext.VBoxUSB (4.3.22) <117 42 33 7 5 4 3 1>
119 0 0xffffff7f81f79000 0x5000 0x5000 org.virtualbox.kext.VBoxNetFlt (4.3.22) <117 7 5 4 3 1>
120 0 0xffffff7f81f7e000 0x6000 0x6000 org.virtualbox.kext.VBoxNetAdp (4.3.22) <117 5 4 1>
The largest entry is the Airport entry clocking in at a size of 2068480 bytes (these are bytes according to man kextstat), i.e. not big.
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