Messages in this thread Patch in this message | | | Date | Tue, 21 Feb 2006 23:15:17 +0100 | From | Sam Ravnborg <> | Subject | Re: make -j with j <= 4 seems to only load a single CPU core |
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On Tue, Feb 21, 2006 at 10:10:46PM +0100, Jesper Juhl wrote: > On 2/21/06, Jesper Juhl <jesper.juhl@gmail.com> wrote: > > This is quite odd and I've no idea where to start looking for the > > cause, but let me describe what I'm seeing and maybe someone can point > > me in the right direction. > > > > I'm running SMP 2.6.x kernels on a Athlon 64 X2 4400+ > > > > I should probably mention that the kernel I'm currently running and > observing this behaviour with is 2.6.16-rc4-mm1.
Hi Jesper. Could you please double check that patch below has been applied to your tree.
Sam
diff-tree 36cbbe5eb9857730768aa5f54ad94d69e0b2133d (from 9f672004ab1a8094bec1785b39ac683ab9eebebc) Author: Benjamin LaHaise <bcrl@kvack.org> Date: Wed Feb 15 15:17:35 2006 -0800
[PATCH] kbuild: revert "fix make -jN with multiple targets with O=..." Commit 296e0855b0f9a4ec9be17106ac541745a55b2ce1: "kbuild: fix make -jN with multiple targets with O=..." causes a ~95% increase in build time for the kernel. Before: 4m21s after: 8m1.403s. Can we revert this until another approach is found? Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/Makefile b/Makefile index 74d67b2..48d569d 100644 --- a/Makefile +++ b/Makefile @@ -104,17 +104,16 @@ ifneq ($(KBUILD_OUTPUT),) saved-output := $(KBUILD_OUTPUT) KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) $(if $(KBUILD_OUTPUT),, \ $(error output directory "$(saved-output)" does not exist)) -.PHONY: $(MAKECMDGOALS) cdbuilddir -$(MAKECMDGOALS) _all: cdbuilddir +.PHONY: $(MAKECMDGOALS) -cdbuilddir: +$(filter-out _all,$(MAKECMDGOALS)) _all: $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ KBUILD_SRC=$(CURDIR) \ - KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $(MAKECMDGOALS) + KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@ # Leave processing to above invocation of make skip-makefile := 1 endif # ifneq ($(KBUILD_OUTPUT),) endif # ifeq ($(KBUILD_SRC),) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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