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Message-ID: <tip-6e3d8330ae2c4b2c11a9577a0130d2ecda1c610d@git.kernel.org>
Date: Mon, 23 Nov 2009 11:52:58 GMT
From: tip-bot for Ingo Molnar <mingo@...e.hu>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
efault@....de, fweisbec@...il.com, tglx@...utronix.de,
mingo@...e.hu
Subject: [tip:perf/core] perf events: Do not generate function trace entries in perf code
Commit-ID: 6e3d8330ae2c4b2c11a9577a0130d2ecda1c610d
Gitweb: http://git.kernel.org/tip/6e3d8330ae2c4b2c11a9577a0130d2ecda1c610d
Author: Ingo Molnar <mingo@...e.hu>
AuthorDate: Mon, 23 Nov 2009 10:19:20 +0100
Committer: Ingo Molnar <mingo@...e.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@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.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
--
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