sched/deadline: Zero out positive runtime after throttling constrained tasks
authorXunlei Pang <xlpang@redhat.com>
Wed, 10 May 2017 13:03:37 +0000 (21:03 +0800)
committerIngo Molnar <mingo@kernel.org>
Thu, 8 Jun 2017 08:31:58 +0000 (10:31 +0200)
commitae83b56a56f8d9643dedbee86b457fa1c5d42f59
tree0b61cb1fa30e32b71f18b29bd1dbbdaffaaf4d0a
parentccc9d651a7d26fec88d2375c4dd4e097cc0f8de7
sched/deadline: Zero out positive runtime after throttling constrained tasks

When a contrained task is throttled by dl_check_constrained_dl(),
it may carry the remaining positive runtime, as a result when
dl_task_timer() fires and calls replenish_dl_entity(), it will
not be replenished correctly due to the positive dl_se->runtime.

This patch assigns its runtime to 0 if positive after throttling.

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luca Abeni <luca.abeni@santannapisa.it>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: df8eac8cafce ("sched/deadline: Throttle a constrained deadline task activated after the deadline)
Link: http://lkml.kernel.org/r/1494421417-27550-1-git-send-email-xlpang@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/sched/deadline.c