On 8/16/19 10:06 AM, Ilya Leoshkevich wrote:

When doing "make kselftest TARGETS=bpf -j12", bpf progs end up being compiled sequentially and thus slowly.

The reason is that parent make (tools/testing/selftests/Makefile) does not share its jobserver with child make (tools/testing/selftests/bpf/Makefile), therefore the latter runs with -j1.

Change all instances of "make" to "$(MAKE)", so that the whole make hierarchy runs using a single jobserver.

Signed-off-by: Ilya Leoshkevich iii@linux.ibm.com

I tested this with:

make kselftest make -C tools/testing/selftests make -C tools/testing/selftests/bpf

Unfortunately, in my setup a lot of tests fail for a number of reasons. However, this change does not make it worse.

tools/testing/selftests/Makefile | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 25b43a8c2b15..c3feccb99ff5 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -126,9 +126,9 @@ endif # in the default INSTALL_HDR_PATH usr/include. khdr: ifeq (1,$(DEFAULT_INSTALL_HDR_PATH))

• make --no-builtin-rules ARCH=$(ARCH) -C $(top_srcdir) headers_install

• $(MAKE) --no-builtin-rules ARCH=$(ARCH) -C $(top_srcdir) headers_install else

• make --no-builtin-rules INSTALL_HDR_PATH=$$BUILD/usr \

• $(MAKE) --no-builtin-rules INSTALL_HDR_PATH=$$BUILD/usr \ ARCH=$(ARCH) -C $(top_srcdir) headers_install endif

@@ -136,35 +136,35 @@ all: khdr @for TARGET in $(TARGETS); do \ BUILD_TARGET=$$BUILD/$$TARGET; \ mkdir $$BUILD_TARGET -p; \

• make OUTPUT=$$BUILD_TARGET -C $$TARGET;\
  

• $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET;\
  

  done;

run_tests: all @for TARGET in $(TARGETS); do \ BUILD_TARGET=$$BUILD/$$TARGET; \

• make OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests;\
  

• $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests;\
  

  done;

hotplug: @for TARGET in $(TARGETS_HOTPLUG); do \ BUILD_TARGET=$$BUILD/$$TARGET; \

• make OUTPUT=$$BUILD_TARGET -C $$TARGET;\
  

• $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET;\
  

  done;

run_hotplug: hotplug @for TARGET in $(TARGETS_HOTPLUG); do \ BUILD_TARGET=$$BUILD/$$TARGET; \

• make OUTPUT=$$BUILD_TARGET -C $$TARGET run_full_test;\
  

• $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_full_test;\
  

  done;

clean_hotplug: @for TARGET in $(TARGETS_HOTPLUG); do \ BUILD_TARGET=$$BUILD/$$TARGET; \

• make OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
  

• $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
  

  done;

run_pstore_crash:

• make -C pstore run_crash

• $(MAKE) -C pstore run_crash

# Use $BUILD as the default install root. $BUILD points to the # right output location for the following cases: @@ -184,7 +184,7 @@ ifdef INSTALL_PATH install -m 744 kselftest/prefix.pl $(INSTALL_PATH)/kselftest/ @for TARGET in $(TARGETS); do \ BUILD_TARGET=$$BUILD/$$TARGET; \

• make OUTPUT=$$BUILD_TARGET -C $$TARGET INSTALL_PATH=$(INSTALL_PATH)/$$TARGET install; \
  

• $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET INSTALL_PATH=$(INSTALL_PATH)/$$TARGET install; \
  

  done;

@# Ask all targets to emit their test scripts @@ -203,7 +203,7 @@ ifdef INSTALL_PATH echo "[ -w /dev/kmsg ] && echo "kselftest: Running tests in $$TARGET" >> /dev/kmsg" >> $(ALL_SCRIPT); \ echo "cd $$TARGET" >> $(ALL_SCRIPT); \ echo -n "run_many" >> $(ALL_SCRIPT); \

• make -s --no-print-directory OUTPUT=$$BUILD_TARGET -C $$TARGET emit_tests >> $(ALL_SCRIPT); \
  

• $(MAKE) -s --no-print-directory OUTPUT=$$BUILD_TARGET -C $$TARGET emit_tests >> $(ALL_SCRIPT); \
  

  echo "" >> $(ALL_SCRIPT); \ echo "cd $$ROOT" >> $(ALL_SCRIPT); \ done;

@@ -216,7 +216,7 @@ endif clean: @for TARGET in $(TARGETS); do \ BUILD_TARGET=$$BUILD/$$TARGET; \

• make OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
  

• $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET clean;\
  

  done;

.PHONY: khdr all run_tests hotplug run_hotplug clean_hotplug run_pstore_crash install clean

Thanks. I will apply this for 5.4-rc1

thanks, -- Shuah