From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 27 Jun 2008 11:41:16 +0000 (+0200)
Subject: sched: fix wakeup granularity and buddy granularity
X-Git-Tag: v2.6.27-rc1~1105^2~35
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=103638d95ba5b0c53c8d9c0cb581156ccc8513ee;p=pandora-kernel.git

sched: fix wakeup granularity and buddy granularity

Uncouple buddy selection from wakeup granularity.

The initial idea was that buddies could run ahead as far as a normal task
can - do this by measuring a pair 'slice' just as we do for a normal task.

This means we can drop the wakeup_granularity back to 5ms.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index eb3454c410fa..7d282c52bd42 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -375,6 +375,7 @@ struct cfs_rq {
 
 	u64 exec_clock;
 	u64 min_vruntime;
+	u64 pair_start;
 
 	struct rb_root tasks_timeline;
 	struct rb_node *rb_leftmost;
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