[PATCH 23/25] docs: jobserver: do some documentation improvements
From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Date: 2026-01-19 16:23:34
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Subsystem:
documentation, documentation scripts, the rest · Maintainers:
Jonathan Corbet, Mauro Carvalho Chehab, Linus Torvalds
Make Sphinx handle better jobserver class documentation Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> --- tools/lib/python/jobserver.py | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/tools/lib/python/jobserver.py b/tools/lib/python/jobserver.py
index 616411087725..8da1973e5c87 100755
--- a/tools/lib/python/jobserver.py
+++ b/tools/lib/python/jobserver.py@@ -11,20 +11,23 @@ Interacts with the POSIX jobserver during the Kernel build time. A "normal" jobserver task, like the one initiated by a make subrocess would do: - open read/write file descriptors to communicate with the job server; - - ask for one slot by calling: + - ask for one slot by calling:: + claim = os.read(reader, 1) - - when the job finshes, call: + + - when the job finshes, call:: + os.write(writer, b"+") # os.write(writer, claim) Here, the goal is different: This script aims to get the remaining number of slots available, using all of them to run a command which handle tasks in parallel. To to that, it has a loop that ends only after there are no slots left. It then increments the number by one, in order to allow a -call equivalent to make -j$((claim+1)), e.g. having a parent make creating +call equivalent to ``make -j$((claim+1))``, e.g. having a parent make creating $claim child to do the actual work. The end goal here is to keep the total number of build tasks under the -limit established by the initial make -j$n_proc call. +limit established by the initial ``make -j$n_proc`` call. See: https://www.gnu.org/software/make/manual/html_node/POSIX-Jobserver.html#POSIX-Jobserver
@@ -40,13 +43,14 @@ class JobserverExec: Claim all slots from make using POSIX Jobserver. The main methods here are: + - open(): reserves all slots; - close(): method returns all used slots back to make; - - run(): executes a command setting PARALLELISM=<available slots jobs + 1> + - run(): executes a command setting PARALLELISM=<available slots jobs + 1>. """ def __init__(self): - """Initialize internal vars""" + """Initialize internal vars.""" self.claim = 0 self.jobs = b"" self.reader = None
@@ -54,7 +58,7 @@ class JobserverExec: self.is_open = False def open(self): - """Reserve all available slots to be claimed later on""" + """Reserve all available slots to be claimed later on.""" if self.is_open: return
@@ -118,7 +122,7 @@ class JobserverExec: self.is_open = True def close(self): - """Return all reserved slots to Jobserver""" + """Return all reserved slots to Jobserver.""" if not self.is_open: return
--
2.52.0