linux-kernel - Re: [git] CFS-devel, latest code

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Date:	Tue, 02 Oct 2007 21:59:04 +0200
From:	Dmitry Adamushko <dmitry.adamushko@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [git] CFS-devel, latest code


The following patch (sched: disable sleeper_fairness on SCHED_BATCH)
seems to break GROUP_SCHED. Although, it may be
'oops'-less due to the possibility of 'p' being always a valid
address.


Signed-off-by: Dmitry Adamushko <dmitry.adamushko@...il.com>

---
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 8727d17..a379456 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -473,9 +473,8 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
 		vruntime += sched_vslice_add(cfs_rq, se);
 
 	if (!initial) {
-		struct task_struct *p = container_of(se, struct task_struct, se);
-
-		if (sched_feat(NEW_FAIR_SLEEPERS) && p->policy != SCHED_BATCH)
+		if (sched_feat(NEW_FAIR_SLEEPERS) && entity_is_task(se) &&
+				task_of(se)->policy != SCHED_BATCH)
 			vruntime -= sysctl_sched_latency;
 
 		vruntime = max_t(s64, vruntime, se->vruntime);

---


-
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