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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-07-11 23:23:53 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-07-17 09:44:37 -0400
commit1026ff9b8e6cbb112fd708b2e62f1812ce9a4e01 (patch)
tree10b87601e9060c2cdb662c0783bbbca00c4a8e23 /arch/x86/include
parent646d7043adf3d92de5d3db1244a82a12628303de (diff)
downloadlinux-1026ff9b8e6cbb112fd708b2e62f1812ce9a4e01.tar.gz
ftrace/x86: Have function graph tracer use its own trampoline
The function graph trampoline is called from the function trampoline and both do a save and restore of registers. The save of registers done by the function trampoline when only the function graph tracer is running is a waste of CPU cycles. As the function graph tracer trampoline in x86 is dependent from the function trampoline, we can call it directly when a function is only being traced by the function graph trampoline. Acked-by: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/ftrace.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index 0525a8bdf65..e1f7fecaa7d 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -68,6 +68,8 @@ struct dyn_arch_ftrace {
int ftrace_int3_handler(struct pt_regs *regs);
+#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
+
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */