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authorRichard Purdie <richard.purdie@linuxfoundation.org>2013-09-20 09:54:40 +0000
committerRichard Purdie <richard.purdie@linuxfoundation.org>2013-09-22 12:19:44 +0100
commit35a1d37ac8fd57bef6bc4de8047ffcadf7df7e56 (patch)
tree7ea12c3f5f1046adb14d0f586bdbbed6f285a858 /bitbake/lib
parentace48c2866b9e74051ea97e26f09eaded9c21dcf (diff)
downloadpoky-35a1d37ac8fd57bef6bc4de8047ffcadf7df7e56.tar.gz
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 <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'bitbake/lib')
-rw-r--r--bitbake/lib/bb/build.py8
1 files changed, 8 insertions, 0 deletions
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):
346 if not tempdir: 346 if not tempdir:
347 bb.fatal("T variable not set, unable to build") 347 bb.fatal("T variable not set, unable to build")
348 348
349 # Change nice level if we're asked to
350 nice = localdata.getVar("BB_TASK_NICE_LEVEL", True)
351 if nice:
352 curnice = os.nice(0)
353 nice = int(nice) - curnice
354 newnice = os.nice(nice)
355 logger.debug(1, "Renice to %s " % newnice)
356
349 bb.utils.mkdirhier(tempdir) 357 bb.utils.mkdirhier(tempdir)
350 358
351 # Determine the logfile to generate 359 # Determine the logfile to generate