7bf99fb673
Enable gcov profiling of the entire kernel on x86_64. Required changes include disabling profiling for: * arch/kernel/acpi/realmode and arch/kernel/boot/compressed: not linked to main kernel * arch/vdso, arch/kernel/vsyscall_64 and arch/kernel/hpet: profiling causes segfaults during boot (incompatible context) Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Huang Ying <ying.huang@intel.com> Cc: Li Wei <W.Li@Sun.COM> Cc: Michael Ellerman <michaele@au1.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Heiko Carstens <heicars2@linux.vnet.ibm.com> Cc: Martin Schwidefsky <mschwid2@linux.vnet.ibm.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
48 lines
1.2 KiB
Text
48 lines
1.2 KiB
Text
menu "GCOV-based kernel profiling"
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config GCOV_KERNEL
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bool "Enable gcov-based kernel profiling"
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depends on DEBUG_FS && CONSTRUCTORS
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default n
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---help---
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This option enables gcov-based code profiling (e.g. for code coverage
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measurements).
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If unsure, say N.
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Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data
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for the entire kernel. To enable profiling for specific files or
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directories, add a line similar to the following to the respective
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Makefile:
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For a single file (e.g. main.o):
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GCOV_PROFILE_main.o := y
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For all files in one directory:
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GCOV_PROFILE := y
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To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL
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is specified, use:
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GCOV_PROFILE_main.o := n
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and:
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GCOV_PROFILE := n
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Note that the debugfs filesystem has to be mounted to access
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profiling data.
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config GCOV_PROFILE_ALL
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bool "Profile entire Kernel"
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depends on GCOV_KERNEL
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depends on S390 || X86
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default n
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---help---
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This options activates profiling for the entire kernel.
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If unsure, say N.
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Note that a kernel compiled with profiling flags will be significantly
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larger and run slower. Also be sure to exclude files from profiling
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which are not linked to the kernel image to prevent linker errors.
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endmenu
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