linux-kernel - [PATCH] tracing/function-graph-tracer: don't profile branches on graph tracer

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Date:	Sun, 22 Mar 2009 18:01:29 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH] tracing/function-graph-tracer: don't profile branches on graph tracer

Impact: fix slow tracing

The core kernel tracing is protected against soft branch profiling, but
not the x86 ftrace arch part. Let's fix it.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/x86/kernel/Makefile |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 599e9a7..8d9b3f9 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -13,6 +13,7 @@ CFLAGS_REMOVE_rtc.o = -pg
 CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
 CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
+CFLAGS_ftrace.o += -DDISABLE_BRANCH_PROFILING
 endif
 
 #
-- 
1.6.1

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