Kernel Function Trace - Revision history

FransMeulenbroeks at 16:24, 15 November 2008

2008-11-15T16:24:02Z

TimBird: /* kft log output (excerpt) */ upload sample kfi log

2008-06-12T21:20:17Z

‎kft log output (excerpt): upload sample kfi log

TimBird: /* kft log analysis with 'kd' */ fix table

2008-06-12T21:12:34Z

‎kft log analysis with 'kd': fix table

Show changes

Tim Bird: /* Basic Use */ add link to Using Kernel Function Trace

2008-05-07T23:21:03Z

‎Basic Use: add link to Using Kernel Function Trace

TimBird: /* Patches */ add link to Nicholas' download page

2007-06-08T21:05:55Z

‎Patches: add link to Nicholas' download page

TimBird: /* Patches */ fix links to patch archive

2007-04-27T21:42:27Z

‎Patches: fix links to patch archive

TimBird: /* Patches */ create links for older KFI patches

2007-04-27T21:34:16Z

‎Patches: create links for older KFI patches

TimBird: /* kft nested call trace with 'kd -c' */

2007-04-27T21:21:51Z

‎kft nested call trace with 'kd -c'

TimBird: /* Basic Use */ fix wording on attachment links

2007-04-27T21:16:09Z

‎Basic Use: fix wording on attachment links

RBot at 14:33, 8 March 2007

2007-03-08T14:33:26Z

← Older revision		Revision as of 16:24, 15 November 2008
Line 295:		Line 295:

	[[Category:Boot Time]]		[[Category:Boot Time]]
		+	[[Category:Measuring]]
	[[Category:Kernel Function Trace]]		[[Category:Kernel Function Trace]]

@@ Line 174: / Line 174: @@
 </code>
-The log is attached here: kfiboot-9.lst
+The log is attached here: [[Media:Kfiboot-9.lst]]
 A Delta value of 0 usually means the exit from the routine was not seen.

@@ Line 18: / Line 18: @@
 == Basic Use ==
 Documentation for KFT is available (as of 2.6.12) in Documentation/kft.txt, after applying the kft-all-in-one.patch.
 Here's a presentation about KFT usage:

@@ Line 27: / Line 27: @@
 == Download ==
 === Patches ===
-* Patch for CELF kernel (based on linux-2.4.20): [[Media:kfi-24-test4.patch|kfi-24-test4.patch]]
+* Download directory with recent versions: ftp://dslab.lzu.edu.cn/pub/kft/
 * Patch for Linux 2.6.7 (for x86 only): [[Media:kfi-26-test1.patch|kfi-26-test1.patch]]
-* Patch for Linux 2.6.8.1: see the [[Patch Archive]] page
+* Patch for CELF kernel (based on linux-2.4.20): [[Media:kfi-24-test4.patch|kfi-24-test4.patch]]
-* Patch for Linux 2.6.11: see the [[Patch Archive]] page (or just download [[Media:kfi-2.patch|kfi-2.patch]])
-* Patch for Linux 2.6.12: see the [[Patch Archive]] page (available as an all-in-one patch or a tar archive of broken-out patches)
 === KFT utilities ===

@@ Line 29: / Line 29: @@
 * Patch for CELF kernel (based on linux-2.4.20): [[Media:kfi-24-test4.patch|kfi-24-test4.patch]]
 * Patch for Linux 2.6.7 (for x86 only): [[Media:kfi-26-test1.patch|kfi-26-test1.patch]]
-* Patch for Linux 2.6.8.1: see the PatchArchive page
+* Patch for Linux 2.6.8.1: see the [[Patch Archive]] page
-* Patch for Linux 2.6.11: see the PatchArchive page (or just download [[Media:kfi-2.patch|kfi-2.patch]])
+* Patch for Linux 2.6.11: see the [[Patch Archive]] page (or just download [[Media:kfi-2.patch|kfi-2.patch]])
-* Patch for Linux 2.6.12: see the PatchArchive page (available as an all-in-one patch or a tar archive of broken-out patches)
+* Patch for Linux 2.6.12: see the [[Patch Archive]] page (available as an all-in-one patch or a tar archive of broken-out patches)
 === KFT utilities ===

@@ Line 438: / Line 438: @@
 </code>
-To see the full trace, go to the KftDoForkTrace page.
+To see the full trace, go to the [[KftDoForkTrace]] page.
 [[Category:Boot Time]]
 [[Category:Kernel Function Trace]]

@@ Line 20: / Line 20: @@
 Here's a presentation about KFT usage:
-* [[Media:KFI-presentation.pdf|Learning the Kernel and Finding Performance Problems with KFI]]
+* Presentation: [[Media:KFI-presentation.pdf|Learning the Kernel and Finding Performance Problems with KFI]]
-* [[Media:omap-serial_init.trace.txt]] - Sample trace used with presentation
+* Sample trace used with presentation: [[Media:omap-serial_init.trace.txt|omap-serial_init.trace.txt]]
 KFT used to be called KFI (for Kernel Function Instrumentation). For prior releases of KFT, see KernelFunctionInstrumentation

@@ Line 20: / Line 20: @@
 Here's a presentation about KFT usage:
-*{{pdf|media:KFI-presentation.pdf Learning the Kernel and Finding Performance Problems with KFI}}
+* [[Media:KFI-presentation.pdf|Learning the Kernel and Finding Performance Problems with KFI]]
-*omap-serial_init.trace.txt - Sample trace used with presentation
+* [[Media:omap-serial_init.trace.txt]] - Sample trace used with presentation
 KFT used to be called KFI (for Kernel Function Instrumentation). For prior releases of KFT, see KernelFunctionInstrumentation
@@ Line 27: / Line 27: @@
 == Download ==
 === Patches ===
-*Patch for CELF kernel (based on linux-2.4.20): kfi-24-test4.patch
+* Patch for CELF kernel (based on linux-2.4.20): kfi-24-test4.patch
-*Patch for Linux 2.6.7 (for x86 only): kfi-26-test1.patch
+* Patch for Linux 2.6.7 (for x86 only): kfi-26-test1.patch
-*Patch for Linux 2.6.8.1: see the PatchArchive page
+* Patch for Linux 2.6.8.1: see the PatchArchive page
-*Patch for Linux 2.6.11: see the PatchArchive page (or just download kfi-2.patch)
+* Patch for Linux 2.6.11: see the PatchArchive page (or just download kfi-2.patch)
-*Patch for Linux 2.6.12: see the PatchArchive page (available as an all-in-one patch or a tar archive of broken-out patches)
+* Patch for Linux 2.6.12: see the PatchArchive page (available as an all-in-one patch or a tar archive of broken-out patches)
 === KFT utilities ===
 KFT includes several helper scripts which are located in the kernel <code>scripts</code> directory:
-*addr2sym - convert function addresses to symbols in the trace data
+* addr2sym - convert function addresses to symbols in the trace data
-*kd - KFT dump - does filtering, sorting, analysis and trace formatting of KFT trace logs
+* kd - KFT dump - does filtering, sorting, analysis and trace formatting of KFT trace logs
-*mkkftrun.pl - used during building the kernel to convert a configuration file into a C file to be compiled into the kernel
+* mkkftrun.pl - used during building the kernel to convert a configuration file into a C file to be compiled into the kernel
-*sym2addr - convert function names to addresses in a KFT configuration file (for a dynamic trace)
+* sym2addr - convert function names to addresses in a KFT configuration file (for a dynamic trace)
 See Documentation/kft.txt, in the kernel source tree after applying the patch, for instructions on using these programs.
 == How To Use ==
-*download both the patch
+* download both the patch
-*apply the patch in the kernel top-level directory:
+* apply the patch in the kernel top-level directory:
-*patch -p1 <kft.patch
+* patch -p1 <kft.patch
-*read the rest of the instructions in the Documentation/kft.txt file. (my apologies for being lazy!)
+* read the rest of the instructions in the Documentation/kft.txt file. (my apologies for being lazy!)
 === Adding platform support for the kft clock source ===
@@ Line 53: / Line 53: @@
 If your platform has good support for sched_clock(), then KFT should work for you unmodified. If not, you may wish to do one of two things:
- *improve support for sched_clock() in your board port, or
+* improve support for sched_clock() in your board port, or
- *write a custom kft_readclock() routine.
+* write a custom kft_readclock() routine.
 A "good" sched_clock() routine will provide at least microsecond resolution on return values. Some architectures have sched_clock() returning values based on the <code>jiffy</code> variable,
@@ Line 63: / Line 63: @@
 == Issues ==
 Here is a list of things that need more work:
-*may need to add noinstrument attributes for some time-critical code (need to check this)
+* may need to add noinstrument attributes for some time-critical code (need to check this)
-**maybe check "Function Trace in KDB" patch for help with this
+** maybe check "Function Trace in KDB" patch for help with this
 === Overhead ===