sched/deadline: Modify cpudl::free_cpus to reflect rd->online

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Currently, cpudl::free_cpus contains all CPUs during init, see
cpudl_init(). When calling cpudl_find(), we have to add rd->span
to avoid selecting the cpu outside the current root domain, because
cpus_allowed cannot be depended on when performing clustered
scheduling using the cpuset, see find_later_rq().

This patch adds cpudl_set_freecpu() and cpudl_clear_freecpu() for
changing cpudl::free_cpus when doing rq_online_dl()/rq_offline_dl(),
so we can avoid the rd->span operation when calling cpudl_find()
in find_later_rq().

Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1421642980-10045-1-git-send-email-pang.xunlei@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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This commit is contained in:

Xunlei Pang 2015-01-19 04:49:36 +00:00 • committed by Ingo Molnar

parent ff6f2d29bd

commit 16b269436b

3 changed files with 28 additions and 7 deletions

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28

kernel/sched/cpudeadline.c

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2

kernel/sched/cpudeadline.h

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5

kernel/sched/deadline.c

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