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Rework logic for skipping .depend/.meta file read/stat/writes.

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- Rename _SKIP_READ_DEPEND to _SKIP_DEPEND since it also avoids writing.
- This now uses .NOMETA to avoid reading any .meta files related to
  DEPENDOBJS.  Objects not in OBJS/DEPENDOBJS may still have their .meta
  files read in if they are in the dependency graph.
- This also avoids statting .meta and .depend files in the META_MODE +
  -DNO_FILEMON case.

MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
This commit is contained in:
Bryan Drewery 2017-06-22 05:34:41 +00:00
parent 091867a611
commit 210ecc0021
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=320220
2 changed files with 31 additions and 9 deletions
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22
share/mk/bsd.dep.mk
View File

@ -86,10 +86,13 @@ _meta_filemon= 1
# Skip reading .depend when not needed to speed up tree-walks and simple
# lookups. See _SKIP_BUILD logic in bsd.init.mk for more details.
# Also skip generating or including .depend.* files if in meta+filemon mode
# since it will track dependencies itself. OBJS_DEPEND_GUESS is still used.
.if defined(_SKIP_BUILD) || defined(_meta_filemon)
_SKIP_READ_DEPEND= 1
# since it will track dependencies itself. OBJS_DEPEND_GUESS is still used
# for _meta_filemon but not for _SKIP_DEPEND.
.if defined(_SKIP_BUILD)
_SKIP_DEPEND= 1
.endif
.if ${MK_DIRDEPS_BUILD} == "no"
.if defined(_SKIP_DEPEND) || defined(_meta_filemon)
.MAKE.DEPENDFILE= /dev/null
.endif
.endif
@ -180,6 +183,15 @@ DEPENDSRCS= ${SRCS:M*.[cSC]} ${SRCS:M*.cxx} ${SRCS:M*.cpp} ${SRCS:M*.cc}
DEPENDOBJS+= ${DEPENDSRCS:R:S,$,.o,}
.endif
DEPENDFILES_OBJS= ${DEPENDOBJS:O:u:${DEPEND_FILTER}:C/^/${DEPENDFILE}./}
.if defined(_SKIP_DEPEND)
# Don't bother statting any .meta files for .depend*
${DEPENDOBJS}: .NOMETA
${DEPENDFILE}: .NOMETA
# Unset these to avoid looping/statting on them later.
.undef DEPENDSRCS
.undef DEPENDOBJS
.undef DEPENDFILES_OBJS
.endif # defined(_SKIP_DEPEND)
DEPEND_CFLAGS+= -MD ${DEPEND_MP} -MF${DEPENDFILE}.${.TARGET:${DEPEND_FILTER}}
DEPEND_CFLAGS+= -MT${.TARGET}
.if !defined(_meta_filemon)
@ -191,7 +203,6 @@ CFLAGS+= ${${DEPEND_CFLAGS_CONDITION}:?${DEPEND_CFLAGS}:}
.else
CFLAGS+= ${DEPEND_CFLAGS}
.endif
.if !defined(_SKIP_READ_DEPEND)
.for __depend_obj in ${DEPENDFILES_OBJS}
.if ${MAKE_VERSION} < 20160220
.sinclude "${.OBJDIR}/${__depend_obj}"
@ -199,7 +210,6 @@ CFLAGS+= ${DEPEND_CFLAGS}
.dinclude "${.OBJDIR}/${__depend_obj}"
.endif
.endfor
.endif # !defined(_SKIP_READ_DEPEND)
.endif # !defined(_meta_filemon)
.endif # defined(SRCS)
@ -266,12 +276,14 @@ DPSRCS+= ${SRCS}
# targets are kept as they be used for generating something. The target is
# kept to allow 'make depend' to generate files.
${DEPENDFILE}: ${DPSRCS}
.if !defined(_SKIP_DEPEND)
.if exists(${.OBJDIR}/${DEPENDFILE}) || \
((commands(beforedepend) || \
(!defined(_meta_filemon) && commands(_EXTRADEPEND)) || \
commands(afterdepend)) && !empty(.MAKE.MODE:Mmeta))
rm -f ${DEPENDFILE}
.endif
.endif
.if !defined(_meta_filemon) && target(_EXTRADEPEND)
_EXTRADEPEND: .USE
${DEPENDFILE}: _EXTRADEPEND

18
sys/conf/kern.post.mk
View File

@ -199,12 +199,15 @@ _meta_filemon= 1
# Skip reading .depend when not needed to speed up tree-walks and simple
# lookups. For install, only do this if no other targets are specified.
# Also skip generating or including .depend.* files if in meta+filemon mode
# since it will track dependencies itself. OBJS_DEPEND_GUESS is still used.
# since it will track dependencies itself. OBJS_DEPEND_GUESS is still used
# for _meta_filemon but not for _SKIP_DEPEND.
.if !empty(.MAKEFLAGS:M-V${_V_READ_DEPEND}) || make(*obj) || \
${.TARGETS:M*clean*} == ${.TARGETS} || \
${.TARGETS:M*install*} == ${.TARGETS} || \
defined(_meta_filemon)
_SKIP_READ_DEPEND= 1
_SKIP_DEPEND= 1
.endif
.if defined(_SKIP_DEPEND) || defined(_meta_filemon)
.MAKE.DEPENDFILE= /dev/null
.endif
@ -218,6 +221,15 @@ DEPENDFILES_OBJS= ${DEPENDOBJS:O:u:C/^/.depend./}
.if ${MAKE_VERSION} < 20160220
DEPEND_MP?= -MP
.endif
.if defined(_SKIP_DEPEND)
# Don't bother reading any .meta files
${DEPENDOBJS}: .NOMETA
.depend: .NOMETA
# Unset these to avoid looping/statting on them later.
.undef DEPENDSRCS
.undef DEPENDOBJS
.undef DEPENDFILES_OBJS
.endif # defined(_SKIP_DEPEND)
DEPEND_CFLAGS+= -MD ${DEPEND_MP} -MF.depend.${.TARGET}
DEPEND_CFLAGS+= -MT${.TARGET}
.if !defined(_meta_filemon)
@ -229,7 +241,6 @@ CFLAGS+= ${${DEPEND_CFLAGS_CONDITION}:?${DEPEND_CFLAGS}:}
.else
CFLAGS+= ${DEPEND_CFLAGS}
.endif
.if !defined(_SKIP_READ_DEPEND)
.for __depend_obj in ${DEPENDFILES_OBJS}
.if ${MAKE_VERSION} < 20160220
.sinclude "${.OBJDIR}/${__depend_obj}"
@ -237,7 +248,6 @@ CFLAGS+= ${DEPEND_CFLAGS}
.dinclude "${.OBJDIR}/${__depend_obj}"
.endif
.endfor
.endif # !defined(_SKIP_READ_DEPEND)
.endif # !defined(_meta_filemon)
# Always run 'make depend' to generate dependencies early and to avoid the