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authorSteven Rostedt <srostedt@redhat.com>2010-10-13 17:12:30 -0400
committerSteven Rostedt <rostedt@goodmis.org>2010-10-14 16:52:41 -0400
commit72441cb1fd77d092f09ddfac748955703884c9a7 (patch)
tree3b02aecebf718f1cb6e9752b809e825b237527da
parent81d3858d3131a589cade0d8b57f95cc1fc699b89 (diff)
downloadlinux-linaro-android-72441cb1fd77d092f09ddfac748955703884c9a7.tar.gz
ftrace/x86: Add support for C version of recordmcount
This patch adds the support for the C version of recordmcount and compile times show ~ 12% improvement. After verifying this works, other archs can add: HAVE_C_MCOUNT_RECORD in its Kconfig and it will use the C version of recordmcount instead of the perl version. Cc: <linux-arch@vger.kernel.org> Cc: Michal Marek <mmarek@suse.cz> Cc: linux-kbuild@vger.kernel.org Cc: John Reiser <jreiser@bitwagon.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-rw-r--r--Makefile6
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--kernel/trace/Kconfig5
-rw-r--r--scripts/Makefile1
-rw-r--r--scripts/Makefile.build4
5 files changed, 17 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 534c09c255d..0dd3a8d9313 100644
--- a/Makefile
+++ b/Makefile
@@ -568,6 +568,12 @@ endif
ifdef CONFIG_FUNCTION_TRACER
KBUILD_CFLAGS += -pg
+ifdef CONFIG_DYNAMIC_FTRACE
+ ifdef CONFIG_HAVE_C_MCOUNT_RECORD
+ BUILD_C_RECORDMCOUNT := y
+ export BUILD_C_RECORDMCOUNT
+ endif
+endif
endif
# We trigger additional mismatches with less inlining
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c14d8b4d2f7..788b50ef5fc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -33,6 +33,7 @@ config X86
select HAVE_KRETPROBES
select HAVE_OPTPROBES
select HAVE_FTRACE_MCOUNT_RECORD
+ select HAVE_C_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 538501c6ea5..df00fbbaf60 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -49,6 +49,11 @@ config HAVE_SYSCALL_TRACEPOINTS
help
See Documentation/trace/ftrace-design.txt
+config HAVE_C_MCOUNT_RECORD
+ bool
+ help
+ C version of recordmcount available?
+
config TRACER_MAX_TRACE
bool
diff --git a/scripts/Makefile b/scripts/Makefile
index 842dbc2d5ae..2e088109fbd 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -11,6 +11,7 @@ hostprogs-$(CONFIG_KALLSYMS) += kallsyms
hostprogs-$(CONFIG_LOGO) += pnmtologo
hostprogs-$(CONFIG_VT) += conmakehash
hostprogs-$(CONFIG_IKCONFIG) += bin2c
+hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
always := $(hostprogs-y) $(hostprogs-m)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a1a5cf95a68..4d03a7efc68 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -209,12 +209,16 @@ cmd_modversions = \
endif
ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ifdef BUILD_C_RECORDMCOUNT
+cmd_record_mcount = $(srctree)/scripts/recordmcount "$(@)";
+else
cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
"$(if $(CONFIG_64BIT),64,32)" \
"$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
"$(if $(part-of-module),1,0)" "$(@)";
endif
+endif
define rule_cc_o_c
$(call echo-cmd,checksrc) $(cmd_checksrc) \