linux-kernel - [RFC PATCH 3/4] sched: Gang using set_next

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Message-ID: <20111219083443.32311.61046.stgit@abhimanyu.in.ibm.com>
Date:	Mon, 19 Dec 2011 14:04:58 +0530
From:	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>
To:	peterz@...radead.org, mingo@...e.hu, linux-kernel@...r.kernel.org
Cc:	nikunj@...ux.vnet.ibm.com, vatsa@...ux.vnet.ibm.com,
	bharata@...ux.vnet.ibm.com
Subject: [RFC PATCH 3/4] sched: Gang using set_next_buddy

Gang task group is faroured to be picked up using the set_next_buddy api and
hope that scheduler gives it priority.

Signed-off-by: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
---

 kernel/sched/fair.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c03efd2..9a2f291 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5518,8 +5518,11 @@ static void gang_sched_member(void *info)
 
 	/* Check if the runqueue has runnable tasks */
 	if (cfs_rq->nr_running) {
-		/* Favour this task group and set need_resched flag,
-		 * added by following patches */
+		struct sched_entity *se = tg->se[cpu];
+
+		/* Make the parent favourable */
+		set_next_buddy(se);
+		set_tsk_need_resched(current);
 	}
 	raw_spin_unlock_irqrestore(&rq->lock, flags);
 }

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