I saw someone recommend etrecheck so have also done this...
Problem description:
kernel_task filling my memory
EtreCheck version: 2.4.1 (137)
Report generated 8/17/15, 8:08 PM
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: (What does this mean?)
MacBook Pro (17-inch, Mid 2009) (Technical Specifications)
MacBook Pro - model: MacBookPro5,2
1 2.8 GHz Intel Core 2 Duo CPU: 2-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1067 MHz ok
BANK 1/DIMM0
2 GB DDR3 1067 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Battery: Health = Normal - Cycle count = 108 - SN = 9G322009JDN5A
Video Information: (What does this mean?)
NVIDIA GeForce 9400M - VRAM: 256 MB
NVIDIA GeForce 9600M GT - VRAM: 512 MB
Color LCD 1920 x 1200
System Software: (What does this mean?)
OS X 10.10.4 (14E46) - Time since boot: about one hour
Disk Information: (What does this mean?)
FUJITSU MJA2500BH FFS G1 disk0 : (500.11 GB) (Rotational)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / [Startup]: 499.25 GB (159 MB free) (Low!) - 3 errors
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
MATSHITADVD-R UJ-868 ()
USB Information: (What does this mean?)
Apple Inc. Built-in iSight
Western Digital External HDD 500.11 GB
disk1s1 (disk1s1) <not mounted> : 32 KB
YJB Passport (disk1s3) /Volumes/YJB Passport : 499.97 GB (58.72 GB free)
Apple, Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Gatekeeper: (What does this mean?)
Mac App Store and identified developers
Kernel Extensions: (What does this mean?)
/Applications/Parallels Desktop.app
[not loaded] com.parallels.kext.hidhook (8.0 18354.823166) [Click for support]
[not loaded] com.parallels.kext.hypervisor (8.0 18354.823166) [Click for support]
[not loaded] com.parallels.kext.netbridge (8.0 18354.823166) [Click for support]
[not loaded] com.parallels.kext.usbconnect (8.0 18354.823166) [Click for support]
[not loaded] com.parallels.kext.vnic (8.0 18354.823166) [Click for support]
/Applications/Toast 8 Titanium/Toast Titanium.app
[not loaded] com.roxio.BluRaySupport (1.1.6) [Click for support]
[not loaded] com.roxio.TDIXController (1.7) [Click for support]
/Incompatible Software/Parallels Service.app
[not loaded] com.parallels.kext.prl_hid_hook (5.0 9344.558741) [Click for support]
[not loaded] com.parallels.kext.prl_hypervisor (5.0 9344.558741) [Click for support]
[not loaded] com.parallels.kext.prl_netbridge (5.0 9344.558741) [Click for support]
[not loaded] com.parallels.kext.prl_usb_connect (5.0 9344.558741) [Click for support]
[not loaded] com.parallels.kext.prl_vnic (5.0 9344.558741) [Click for support]
/System/Library/Extensions
[not loaded] com.Huawei.driver.HuaweiDataCardDriver (4.0.6) [Click for support]
[not loaded] com.wdc.driver.1394HP (1.0.5) [Click for support]
[not loaded] com.wdc.driver.USBHP (1.0.1) [Click for support]
[not loaded] jp.plentycom.driver.SteerMouse (4.0.2) [Click for support]
Startup Items: (What does this mean?)
HWNetMgr: Path: /Library/StartupItems/HWNetMgr
ParallelsDesktopTransporter: Path: /Library/StartupItems/ParallelsDesktopTransporter
Startup items are obsolete in OS X Yosemite
Launch Agents: (What does this mean?)
[loaded] com.oracle.java.Java-Updater.plist [Click for support]
[running] com.trusteer.rapport.rapportd.plist [Click for support]
Launch Daemons: (What does this mean?)
[loaded] com.adobe.fpsaud.plist [Click for support]
[loaded] com.mcafee.virusscan.eupdate.plist [Click for support]
[loaded] com.microsoft.office.licensing.helper.plist [Click for support]
[loaded] com.oracle.java.Helper-Tool.plist [Click for support]
[loaded] com.oracle.java.JavaUpdateHelper.plist [Click for support]
[running] com.trusteer.rooks.rooksd.plist [Click for support]
[failed] com.vmware.launchd.vmware.plist [Click for support]
User Launch Agents: (What does this mean?)
[loaded] com.adobe.ARM.[...].plist [Click for support]
[loaded] com.google.keystone.agent.plist [Click for support]
[running] com.spotify.webhelper.plist [Click for support]
User Login Items: (What does this mean?)
SteerMouse Application (/Applications/Utilities/SteerMouse.app)
Caffeine Application (/Applications/Caffeine.app)
Dropbox Application (/Applications/Dropbox.app)
Google Drive Application (/Applications/Google Drive.app)
Spotify Application Hidden (/Applications/Spotify.app)
Launch Nikon Message Center 2 UNKNOWN (missing value)
Internet Plug-ins: (What does this mean?)
DirectorShockwave: Version: 11.5.0r595 [Click for support]
Default Browser: Version: 600 - SDK 10.10
Flip4Mac WMV Plugin: Version: 2.4.1.4 [Click for support]
OfficeLiveBrowserPlugin: Version: 12.3.6 [Click for support]
AdobePDFViewerNPAPI: Version: 11.0.12 - SDK 10.6 [Click for support]
FlashPlayer-10.6: Version: 18.0.0.232 - SDK 10.6 [Click for support]
DivXBrowserPlugin: Version: 2.0 [Click for support]
Silverlight: Version: 5.1.20913.0 - SDK 10.6 [Click for support]
Flash Player: Version: 18.0.0.232 - SDK 10.6 [Click for support]
QuickTime Plugin: Version: 7.7.3
iPhotoPhotocast: Version: 7.0
SharePointBrowserPlugin: Version: 14.5.3 - SDK 10.6 [Click for support]
AdobePDFViewer: Version: 11.0.12 - SDK 10.6 [Click for support]
JavaAppletPlugin: Version: Java 8 Update 51 Check version
User internet Plug-ins: (What does this mean?)
WebEx64: Version: 1.0 - SDK 10.6 [Click for support]
Safari Extensions: (What does this mean?)
Readability
3rd Party Preference Panes: (What does this mean?)
DivX [Click for support]
Flash Player [Click for support]
Flip4Mac WMV [Click for support]
GnuPG Preferences [Click for support]
Growl [Click for support]
Java [Click for support]
MacFUSE [Click for support]
Perian [Click for support]
SteerMouse [Click for support]
Trusteer Endpoint Protection [Click for support]
Time Machine: (What does this mean?)
Skip System Files: NO
Mobile backups: ON
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 499.25 GB Disk used: 499.09 GB
Destinations:
My Passport for Mac [Local]
Total size: 1.00 TB
Total number of backups: 69
Oldest backup: 2013-11-12 01:49:43 +0000
Last backup: 2015-08-16 22:43:05 +0000
Size of backup disk: Too small
Backup size 1.00 TB < (Disk used 499.09 GB X 3)
Top Processes by CPU: (What does this mean?)
8% WindowServer
0% taskgated
0% fontd
0% rapportd
0% askpermissiond
Top Processes by Memory: (What does this mean?)
774 MB com.apple.WebKit.WebContent(6)
643 MB kernel_task
139 MB Safari
86 MB WindowServer
74 MB spindump
Virtual Memory Information: (What does this mean?)
32 MB Free RAM
3.97 GB Used RAM (1.01 GB Cached)
2 MB Swap Used
Diagnostics Information: (What does this mean?)
Aug 17, 2015, 07:32:32 PM /Library/Logs/DiagnosticReports/Spotify_2015-08-17-193232_[redacted].hang
Aug 17, 2015, 07:30:45 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-17-193045_[redacted] .crash
Aug 17, 2015, 07:27:54 PM ~/Library/Logs/DiagnosticReports/Spotify Helper_2015-08-17-192754_[redacted].crash
Aug 17, 2015, 07:01:27 PM Self test - passed
Aug 17, 2015, 06:41:49 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-17-184149_[redacted] .crash
Aug 17, 2015, 06:37:23 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-17-183723_[redacted] .crash
Aug 17, 2015, 02:27:36 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-17-142736_[redacted] .crash
Aug 17, 2015, 02:02:54 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-17-140254_[redacted] .crash
Aug 16, 2015, 08:14:27 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-16-201427_[redacted] .crash
Aug 16, 2015, 07:58:35 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-16-195835_[redacted] .crash
Aug 16, 2015, 07:49:03 PM /Library/Logs/DiagnosticReports/coresymbolicationd_2015-08-16-194903_[redacted] .crash