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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2008-12-06 03:40:00 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-08 15:11:44 +0100 |
| commit | 8b96f0119818964e4944fd1c423bf6770027d3ac (patch) | |
| tree | 02b5ec86d2fe45d6935d63913b997989f9339bf4 /arch/x86/kernel/Makefile | |
| parent | decbec3838d10ecd7aabdb4c0e05aac0e5f5dc0c (diff) | |
| download | linux-8b96f0119818964e4944fd1c423bf6770027d3ac.tar.gz linux-8b96f0119818964e4944fd1c423bf6770027d3ac.tar.bz2 linux-8b96f0119818964e4944fd1c423bf6770027d3ac.zip | |
tracing/function-graph-tracer: introduce __notrace_funcgraph to filter special functions
Impact: trace more functions
When the function graph tracer is configured, three more files are not
traced to prevent only four functions to be traced. And this impacts the
normal function tracer too.
arch/x86/kernel/process_64/32.c:
I had crashes when I let this file traced. After some debugging, I saw
that the "current" task point was changed inside__swtich_to(), ie:
"write_pda(pcurrent, next_p);" inside process_64.c Since the tracer store
the original return address of the function inside current, we had
crashes. Only __switch_to() has to be excluded from tracing.
kernel/module.c and kernel/extable.c:
Because of a function used internally by the function graph tracer:
__kernel_text_address()
To let the other functions inside these files to be traced, this patch
introduces the __notrace_funcgraph function prefix which is __notrace if
function graph tracer is configured and nothing if not.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/Makefile')
| -rw-r--r-- | arch/x86/kernel/Makefile | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index a3049da61985..1cad9318d217 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -14,12 +14,6 @@ CFLAGS_REMOVE_paravirt-spinlocks.o = -pg CFLAGS_REMOVE_ftrace.o = -pg endif -ifdef CONFIG_FUNCTION_GRAPH_TRACER -# Don't trace __switch_to() but let it for function tracer -CFLAGS_REMOVE_process_32.o = -pg -CFLAGS_REMOVE_process_64.o = -pg -endif - # # vsyscalls (which work on the user stack) should have # no stack-protector checks: |