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Date: Tue, 15 Nov 2016 11:39:11 +0100 From: Daniel Bristot de Oliveira <bristot@...hat.com> To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: Steven Rostedt <rostedt@...dmis.org>, Clark Williams <williams@...hat.com>, "Luis Claudio R . Goncalves" <lgoncalv@...hat.com>, linux-kernel@...r.kernel.org Subject: [PATCH 2/2] sched/rt: Document RT_RUNTIME_SHARE sched feature Add a comment explaining the RT_RUNTIME_SHARE sched feature. Signed-off-by: Daniel Bristot de Oliveira <bristot@...hat.com> Cc: Ingo Molnar <mingo@...hat.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Steven Rostedt <rostedt@...dmis.org> Cc: Clark Williams <williams@...hat.com> Cc: Luis Claudio R. Goncalves <lgoncalv@...hat.com> Cc: linux-kernel@...r.kernel.org diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 5fffebfe..531c4bb 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -65,7 +65,17 @@ SCHED_FEAT(RT_PUSH_IPI, true) #endif SCHED_FEAT(FORCE_SD_OVERLAP, false) + +/* + * Enables the sharing of rt_runtime between CPUs, allowing a CPU to + * run a real-time task up to 100% of the time while leaving more + * space for non-real-time tasks to run on the CPU that lend rt_runtime. + * + * WARNING: This may allow the starvation of non-real-time tasks pinned + * to the CPU in which a spinning rt-task runs forever. + */ SCHED_FEAT(RT_RUNTIME_SHARE, false) + SCHED_FEAT(LB_MIN, false) SCHED_FEAT(ATTACH_AGE_LOAD, true) -- 2.7.4
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