Pass the value of make's -j/--jobs argument to pahole, to avoid out of memory errors and make pahole respect the "jobs" value of make. On systems with little memory but many cores, invoking pahole using -j without argument potentially creates too many pahole instances, causing an out-of-memory situation. Instead, we should pass make's "jobs" value as an argument to pahole's -j, which is likely configured to be (much) lower than the actual core count on such systems. If make was invoked without -j, either via cmdline or MAKEFLAGS, then JOBS will be simply empty, resulting in the existing behavior, as expected. Signed-off-by: Florian Schmaus <flo@xxxxxxxxxxxx> --- scripts/Makefile.btf | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/scripts/Makefile.btf b/scripts/Makefile.btf index b75f09f3f424..c3cbeb13de50 100644 --- a/scripts/Makefile.btf +++ b/scripts/Makefile.btf @@ -3,6 +3,8 @@ pahole-ver := $(CONFIG_PAHOLE_VERSION) pahole-flags-y := +JOBS := $(patsubst -j%,%,$(filter -j%,$(MAKEFLAGS))) + ifeq ($(call test-le, $(pahole-ver), 125),y) # pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars @@ -12,14 +14,14 @@ endif pahole-flags-$(call test-ge, $(pahole-ver), 121) += --btf_gen_floats -pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j +pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j$(JOBS) pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized else # Switch to using --btf_features for v1.26 and later. -pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func,decl_tag_kfuncs +pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j$(JOBS) --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func,decl_tag_kfuncs ifneq ($(KBUILD_EXTMOD),) module-pahole-flags-$(call test-ge, $(pahole-ver), 126) += --btf_features=distilled_base -- 2.45.2
