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| author |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2013-09-20 09:54:40 +0000 |
|---|---|---|
| committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2013-09-22 12:16:31 +0100 |
| commit | 94d82997220c6cfc7028f76719df028ba8254a5c (patch) | |
| tree | 303305b272e5bed599dc3909706d7efcdd2fa97e | |
| parent | b6e2ce1cf7a0ede890f08fabf536a556dc4263c5 (diff) | |
| download | bitbake-94d82997220c6cfc7028f76719df028ba8254a5c.tar.gz | |
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.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
| -rw-r--r-- | lib/bb/build.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/bb/build.py b/lib/bb/build.py index 8aec699e7..2e49a0936 100644 --- a/lib/bb/build.py +++ b/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 |