I looked into the build scripts, focusing on "mkdir" optimization. With this series, I succeeded in speeding up the incremental build with O= option. The following is the result of "time make O=foo", where "foo" is the output directory that has already been built. Before: real 0m8.322s user 0m4.324s sys 0m1.220s After: real 0m6.989s user 0m4.168s sys 0m1.080s 4/6 gave the biggest impact. Masahiro Yamada (6): kbuild: create directory for make cache only when necessary kbuild: remove redundant $(wildcard ...) for cmd_files calculation kbuild: filter-out PHONY targets from "targets" kbuild: create object directories simpler and faster kbuild: optimize object directory creation for incremental build kbuild: remove redundant mkdir from ./Kbuild Kbuild | 2 -- Makefile | 3 +-- arch/x86/entry/vdso/Makefile | 4 ---- scripts/Kbuild.include | 13 +++++++++---- scripts/Makefile.build | 25 +++++++++++++------------ scripts/Makefile.headersinst | 3 +-- scripts/Makefile.host | 12 ------------ scripts/Makefile.lib | 5 ----- scripts/Makefile.modpost | 3 +-- 9 files changed, 25 insertions(+), 45 deletions(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
