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Commit 6e3d8330 authored Nov 23, 2009 by Ingo Molnar

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>

parent bfd45118

arch/x86/kernel/cpu/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

kernel/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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