From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 15 Oct 2007 15:00:18 +0000 (+0200)
Subject: sched: speed up context-switches a bit
X-Git-Tag: v2.6.24-rc1~1289^2~19
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=e5f32a3856caabe745381279f7f32e3b581b59dc;p=~shefty%2Frdma-dev.git

sched: speed up context-switches a bit

speed up context-switches a bit by not clearing p->exec_start.

(as a side-effect, this also makes p->exec_start a universal timestamp
available to cache-hot estimations.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index c240b72b4e6..cea1fa32b3f 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -379,15 +379,6 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	se->exec_start = rq_of(cfs_rq)->clock;
 }
 
-/*
- * We are descheduling a task - update its stats:
- */
-static inline void
-update_stats_curr_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
-{
-	se->exec_start = 0;
-}
-
 /**************************************************
  * Scheduling class queueing methods:
  */
@@ -609,8 +600,6 @@ static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev)
 	if (prev->on_rq)
 		update_curr(cfs_rq);
 
-	update_stats_curr_end(cfs_rq, prev);
-
 	check_spread(cfs_rq, prev);
 	if (prev->on_rq) {
 		update_stats_wait_start(cfs_rq, prev);