From 35a1d37ac8fd57bef6bc4de8047ffcadf7df7e56 Mon Sep 17 00:00:00 2001 From: Richard Purdie Date: Fri, 20 Sep 2013 09:54:40 +0000 Subject: [PATCH] bitbake: build: Add BB_TASK_NICE_LEVEL to task code On Linux its not possible for processes to regain a previous nice level after it has changed. Its therefore not possible to have a core low priority and then raise the priorities of individual tasks. This variable allows us to do something like: BB_TASK_NICE_LEVEL = "5" BB_TASK_NICE_LEVEL_task-testimage = "0" to give priority to specific tasks which the BB_NICE_LEVEL functionality doesn't give us the option of. (Bitbake rev: 94d82997220c6cfc7028f76719df028ba8254a5c) Signed-off-by: Richard Purdie --- bitbake/lib/bb/build.py | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/bitbake/lib/bb/build.py b/bitbake/lib/bb/build.py index 8aec699e79..2e49a09365 100644 --- a/bitbake/lib/bb/build.py +++ b/bitbake/lib/bb/build.py @@ -346,6 +346,14 @@ def _exec_task(fn, task, d, quieterr): if not tempdir: bb.fatal("T variable not set, unable to build") + # Change nice level if we're asked to + nice = localdata.getVar("BB_TASK_NICE_LEVEL", True) + if nice: + curnice = os.nice(0) + nice = int(nice) - curnice + newnice = os.nice(nice) + logger.debug(1, "Renice to %s " % newnice) + bb.utils.mkdirhier(tempdir) # Determine the logfile to generate