Hi Very interesting patch series. I stumbled upon a couple of spelling errors while looking through it, and have a question about the hardcoded dependency list.
On Wed, 2024-04-03 at 09:02 +0200, Martin Hundeb?ll wrote: > Add a class to implement the gnu make fifo style jobserver. The class > can be activated by symply adding an `INHERIT += "jobserver"` to the s/symply/simply/ > local configuration. > > Furthermore, one can configure an external jobserver (i.e. a server > shared between multiple builds), by configured the `JOBSERVER_FIFO` > variable to point at an existing jobserver fifo. > > The jobserver class uses the fifo style jobserver, which doesn't require > passing open file descriptors around. It does, however, require > make-4.4, which isn't available in common distro yet. To work around > this, the class make all recipes (except make and its dependencies > itself) depend on `virtual/make-native`. > > Signed-off-by: Martin Hundebøll <[email protected]> > --- > meta/classes-global/jobserver.bbclass | 80 +++++++++++++++++++++++++++ > meta/conf/bitbake.conf | 2 +- > 2 files changed, 81 insertions(+), 1 deletion(-) > create mode 100644 meta/classes-global/jobserver.bbclass > > diff --git a/meta/classes-global/jobserver.bbclass > b/meta/classes-global/jobserver.bbclass > new file mode 100644 > index 0000000000..c76909fe50 > --- /dev/null > +++ b/meta/classes-global/jobserver.bbclass > @@ -0,0 +1,80 @@ > +JOBSERVER_FIFO ?= "" > +JOBSERVER_FIFO[doc] = "Path to external jobserver fifo to use instead of > creating a per-build server." > + > +addhandler jobserver_setup_fifo > +jobserver_setup_fifo[eventmask] = "bb.event.ConfigParsed" > + > +python jobserver_setup_fifo() { > + # don't setup a per-build fifo, if an external one is configured > + if d.getVar("JOBSERVER_FIFO"): > + return > + > + # don't use a job-server if no parallelism is configured > + jobs = oe.utils.parallel_make(d) > + if jobs in (None, 1): > + return > + > + # reduce jobs by one as a token has implicitly been handed to the > + # process requesting tokens > + jobs -= 1 > + > + fifo = d.getVar("TMPDIR") + "/jobserver_fifo" > + > + # and old fifo might be lingering; remove it > + if os.path.exists(fifo): > + os.remove(fifo) > + > + # create a new fifo to use for communicating tokens > + os.mkfifo(fifo) > + > + # fill the fifo with the number of tokens to hand out > + wfd = os.open(fifo, os.O_RDWR) > + written = os.write(wfd, b"+" * jobs) > + if written != (jobs): > + bb.error("Failed to fil make fifo: {} != {}".format(written, jobs)) > + > + # configure the per-build fifo path to use > + d.setVar("JOBSERVER_FIFO", fifo) > +} > + > +python () { > + # don't configure the fifo if none is defined > + fifo = d.getVar("JOBSERVER_FIFO") > + if not fifo: > + return > + > + # avoid making make-native or its dependencies depend on make-native > itself > + if d.getVar("PN") in ( > + "make-native", > + "libtool-native", > + "pkgconfig-native", > + "automake-native", > + "autoconf-native", > + "m4-native", > + "texinfo-dummy-native", > + "gettext-minimal-native", > + "quilt-native", > + "gnu-config-native", This seems a bit brittle, but I guess make's dependencies doesn't change often. So it is probably not a big issue. How does it break if a dependency is missing? > + ): > + return > + > + # don't make unwilling recipes depend on make-native > + if d.getVar('INHIBIT_DEFAULT_DEPS', False): > + return > + > + # make other recipes depend on make-native to make sure it is new enough > to > + # support the --jobserver-auth=fifo:<path> syntax (from make-4.4 and > onwards) > + d.appendVar("DEPENDS", " virtual/make-native") > + > + # disable the "-j <jobs>" flag, as that overrides the jobserver fifo > tokens > + d.setVar("PARALLEL_MAKE", "") > + d.setVar("PARALLEL_MAKEINST", "") > + > + # set and export the jobserver in the environment > + d.appendVar("MAKEFLAGS", " --jobserver-auth=fifo:" + fifo) > + d.setVarFlag("MAKEFLAGS", "export", "1") > + > + # ignore the joberserver argument part of MAKEFLAGS in the hash, as that s/joberserver/jobserver/ > + # shouldn't change the build output > + d.appendVarFlag("MAKEFLAGS", "vardepvalueexclude", "| > --jobserver-auth=fifo:" + fifo) > +} > diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf > index 6f180d18b0..23a016b31e 100644 > --- a/meta/conf/bitbake.conf > +++ b/meta/conf/bitbake.conf > @@ -960,7 +960,7 @@ BB_HASHEXCLUDE_COMMON ?= "TMPDIR FILE PATH PWD > BB_TASKHASH BBPATH BBSERVER DL_DI > BB_WORKERCONTEXT BB_LIMITEDDEPS BB_UNIHASH extend_recipe_sysroot > DEPLOY_DIR \ > SSTATE_HASHEQUIV_METHOD SSTATE_HASHEQUIV_REPORT_TASKDATA \ > SSTATE_HASHEQUIV_OWNER CCACHE_TOP_DIR BB_HASHSERVE > GIT_CEILING_DIRECTORIES \ > - OMP_NUM_THREADS BB_CURRENTTASK" > + OMP_NUM_THREADS BB_CURRENTTASK JOBSERVER_FIFO" > BB_BASEHASH_IGNORE_VARS ?= "${BB_HASHEXCLUDE_COMMON} PSEUDO_IGNORE_PATHS > BUILDHISTORY_DIR \ > SSTATE_DIR SOURCE_DATE_EPOCH RUST_BUILD_SYS RUST_HOST_SYS > RUST_TARGET_SYS" > BB_HASHCONFIG_IGNORE_VARS ?= "${BB_HASHEXCLUDE_COMMON} DATE TIME > SSH_AGENT_PID \ > > /Andreas
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