Dl walleye 4.4 ab #1
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This patch adds the possibility of getting the delivery of a SIGXCPU signal whenever there is a runtime overrun. The request is done through the sched_flags field within the sched_attr structure. Forward port of https://lkml.org/lkml/2009/10/16/170 Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Juri Lelli <juri.lelli@gmail.com> Signed-off-by: Claudio Scordino <claudio@evidence.eu.com> Signed-off-by: Luca Abeni <luca.abeni@santannapisa.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it> Link: http://lkml.kernel.org/r/1513077024-25461-1-git-send-email-claudio@evidence.eu.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
…T MERGE ] By forcing the removal of the bandwidth check, SCHED_DEADLINE will be able (also) to accept tasks also when the affinity is not equal to the whole root domain.
…DO NOT MERGE ] If the task calls a sched_getattr on its own tid with flags = 1, the dl runqueue status is updated and the current runtime and absolute deadline values are returned.
Use valid dl parameters for sugov kthread, in such a way that priority inheritance does not cause problems. Use its special flag to not count its bandwidth.
The optimization of updating task parameters without moving the task improves the performance for rt tasks, but causes problems in the bandwidth accounting for dl tasks. More specifically, dl tasks need to be enqueued and dequeued to properly update the bandwidth of the runqueue, so this workaround disables that optimization for dl tasks.
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Note that I also removed
aacf274e4b Revert "sched/cpufreq_schedutil: make worker kthread be SCHED_DEADLINE"