Unverified Commit dec74be4 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!773 Compiler: Add value profile support for kernel. 

Merge Pull Request from: @xiongzhou4 
 
Provides value profile support for kernel.
The implementation is based on the existing GCOV feature of the kernel. When the option is opened, the GCOV option `-fprofile-arcs` is changed to `-fprofile-generate`. The latter includes the former and value profile, which can provide more comprehensive feedback directed optimization ability.
The added feature is called  _PGO kernel_ , which can be used to improve the performance of a single application runtime environment.

kernel option(default is n):
CONFIG_PGO_KERNEL=y 
 
Link:https://gitee.com/openeuler/kernel/pulls/773

 

Reviewed-by: default avatarLiu Chao <liuchao173@huawei.com>
Reviewed-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: default avatarXie XiuQi <xiexiuqi@huawei.com>
parents 866cc5dd 2872514e

Makefile

+6 −1
Original line number Diff line number Diff line
@@ -665,7 +665,12 @@ endif # KBUILD_EXTMOD 
# Defaults to vmlinux, but the arch makefile usually adds further targets

all: vmlinux



CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \

ifeq ($(CONFIG_PGO_KERNEL),y)

CFLAGS_GCOV := -fprofile-generate

else

CFLAGS_GCOV := -fprofile-arcs

endif

CFLAGS_GCOV += -ftest-coverage \

	$(call cc-option,-fno-tree-loop-im) \

	$(call cc-disable-warning,maybe-uninitialized,)

export CFLAGS_GCOV

arch/arm64/configs/openeuler_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -7075,6 +7075,7 @@ CONFIG_SECTION_MISMATCH_WARN_ONLY=y 
CONFIG_ARCH_WANT_FRAME_POINTERS=y

CONFIG_FRAME_POINTER=y

# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set

# CONFIG_PGO_KERNEL is not set

# end of Compile-time checks and compiler options



#

arch/arm64/kvm/hyp/vhe/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -9,3 +9,5 @@ ccflags-y := -D__KVM_VHE_HYPERVISOR__ 
obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o

obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \

	 ../fpsimd.o ../hyp-entry.o



GCOV_PROFILE_switch.o := n

arch/um/Makefile-skas

+6 −1
Original line number Diff line number Diff line
@@ -4,7 +4,12 @@ 
#



GPROF_OPT += -pg



ifeq ($(CONFIG_PGO_KERNEL),y)

GCOV_OPT += -fprofile-generate -ftest-coverage

else

GCOV_OPT += -fprofile-arcs -ftest-coverage

endif



CFLAGS-$(CONFIG_GCOV) += $(GCOV_OPT)

CFLAGS-$(CONFIG_GPROF) += $(GPROF_OPT)

arch/um/scripts/Makefile.rules

+6 −0
Original line number Diff line number Diff line
@@ -22,6 +22,12 @@ $(USER_OBJS) $(UNPROFILE_OBJS): \ 
	CHECKFLAGS := $(patsubst $(NOSTDINC_FLAGS),,$(CHECKFLAGS))



# The stubs can't try to call mcount or update basic block data

ifeq ($(CONFIG_PGO_KERNEL),y)

define unprofile

	$(patsubst -pg,,$(patsubst -fprofile-generate -ftest-coverage,,$(1)))

endef

else

define unprofile

	$(patsubst -pg,,$(patsubst -fprofile-arcs -ftest-coverage,,$(1)))

endef

endif