Add a class to implement the gnu make fifo style jobserver. The class can be activated by simply adding an `INHERIT += "jobserver"` to the local configuration.
Furthermore, one can configure an external jobserver (i.e. a server shared between multiple builds), by configuring 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 makes all recipes (except make and its dependencies itself) depend on `virtual/make-native`. Signed-off-by: Martin Hundebøll <mar...@geanix.com> --- meta/classes-global/jobserver.bbclass | 87 +++++++++++++++++++++++++++ meta/conf/bitbake.conf | 2 +- 2 files changed, 88 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..3866b473e6 --- /dev/null +++ b/meta/classes-global/jobserver.bbclass @@ -0,0 +1,87 @@ +JOBSERVER_FIFO ?= "" +JOBSERVER_FIFO[doc] = "Path to external jobserver fifo to use instead of creating a per-build server." + +JOBSERVER_IGNORE ?= "" +JOBSERVER_IGNORE[doc] = "Space separated list of packages that shouldn't be configured to use the jobserver feature." + +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" + + # an 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 + + # don't configure the fifo if the package wants to ignore it + if d.getVar("PN") in (d.getVar("JOBSERVER_IGNORE") or "").split(): + 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", + ): + 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 jobserver argument part of MAKEFLAGS in the hash, as that + # 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 \ -- 2.44.0
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