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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2013-04-23 17:27:40 +0900
committerIngo Molnar <mingo@kernel.org>2013-04-24 08:52:44 +0200
commitd31980846f9688db3ee3e5863525c6ff8ace4c7c (patch)
tree92ec80802dd11061e5b1515a0bf41d9b9be22cb1 /kernel/sched/core.c
parentcfc03118047172f5bdc58d63c607d16d33ce5305 (diff)
downloadlinaro-lsk-d31980846f9688db3ee3e5863525c6ff8ace4c7c.tar.gz
sched: Move up affinity check to mitigate useless redoing overhead
Currently, LBF_ALL_PINNED is cleared after affinity check is passed. So, if task migration is skipped by small load value or small imbalance value in move_tasks(), we don't clear LBF_ALL_PINNED. At last, we trigger 'redo' in load_balance(). Imbalance value is often so small that any tasks cannot be moved to other cpus and, of course, this situation may be continued after we change the target cpu. So this patch move up affinity check code and clear LBF_ALL_PINNED before evaluating load value in order to mitigate useless redoing overhead. In addition, re-order some comments correctly. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Tested-by: Jason Low <jason.low2@hp.com> Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Cc: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1366705662-3587-5-git-send-email-iamjoonsoo.kim@lge.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
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