[tip:perf/core] perf events: Do not generate function trace entries in perf code

tip-bot for Ingo Molnar
2009-11-23T11:53:37Z

Commit-ID: 6e3d8330ae2c4b2c11a9577a0130d2ecda1c610d
Gitweb: http://git.kernel.org/tip/6e3d8330ae2c4b2c11a9577a0130d2ecda1c610d
Author: Ingo Molnar <mingo@elte.hu>
AuthorDate: Mon, 23 Nov 2009 10:19:20 +0100
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 23 Nov 2009 10:19:20 +0100

perf events: Do not generate function trace entries in perf code

Decreases perf overhead when function tracing is enabled,
by about 50%.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/cpu/Makefile | 1 +
kernel/Makefile | 1 +
2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 68537e9..1d2cb38 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -5,6 +5,7 @@
# Don't trace early stages of a secondary CPU boot
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_common.o = -pg
+CFLAGS_REMOVE_perf_event.o = -pg
endif

# Make sure load_percpu_segment has no stackprotector
diff --git a/kernel/Makefile b/kernel/Makefile
index 17b575e..6b7ce81 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -21,6 +21,7 @@ CFLAGS_REMOVE_mutex-debug.o = -pg
CFLAGS_REMOVE_rtmutex-debug.o = -pg
CFLAGS_REMOVE_cgroup-debug.o = -pg
CFLAGS_REMOVE_sched_clock.o = -pg
+CFLAGS_REMOVE_perf_event.o = -pg
endif

obj-$(CONFIG_FREEZER) += freezer.o