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From: Tim Blechmann <tim@klingt.org>
To: linux-kernel@vger.kernel.org
Subject: [PATCH 1/5] process_64: remove branch hint
Date: Tue, 24 Nov 2009 11:55:15 +0100	[thread overview]
Message-ID: <4B0BBB93.3080307@klingt.org> (raw)
In-Reply-To: <cover.1259059549.git.tim@klingt.org>

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branch hint profiling of my nehalem machine, showed 96% incorrect branch
hints:

 6548732 174664120  96 __switch_to                    process_64.c
   406
 6548745 174565593  96 __switch_to                    process_64.c
   410

Signed-off-by: Tim Blechmann <tim@klingt.org>
---
 arch/x86/kernel/process_64.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index c8d0ece..1e2e1fe 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -403,11 +403,11 @@ __switch_to(struct task_struct *prev_p, struct
task_struct *next_p)
 	 * This won't pick up thread selector changes, but I guess that is ok.
 	 */
 	savesegment(es, prev->es);
-	if (unlikely(next->es | prev->es))
+	if (next->es | prev->es)
 		loadsegment(es, next->es);
  	savesegment(ds, prev->ds);
-	if (unlikely(next->ds | prev->ds))
+	if (next->ds | prev->ds)
 		loadsegment(ds, next->ds);
  -- 1.6.4.2



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       reply	other threads:[~2009-11-24 11:11 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1259059549.git.tim@klingt.org>
2009-11-24 10:55 ` Tim Blechmann [this message]
2009-11-24 16:57   ` [tip:sched/core] sched, x86: Optimize branch hint in __switch_to() tip-bot for Tim Blechmann
2009-11-24 17:28     ` Brian Gerst
2009-11-25  9:03       ` Tim Blechmann
2009-11-25 15:53         ` Brian Gerst
2009-11-25 16:16           ` index 780cd92..22db86a 100644 Brian Gerst
2009-11-25 16:17           ` [PATCH] x86, 64-bit: Set data segments to null after switching to 64-bit mode Brian Gerst
2009-11-26  9:56             ` [tip:x86/asm] " tip-bot for Brian Gerst
2009-11-29 11:44             ` [PATCH] " Tim Blechmann
2009-12-02 11:32     ` [PATCH] Revert "sched, x86: Optimize branch hint in __switch_to()" Tim Blechmann
2009-12-02 13:27       ` [tip:sched/core] " tip-bot for Tim Blechmann
2009-11-24 10:55 ` [PATCH 2/5] sched.c: change branch hint Tim Blechmann
2009-11-24 16:56   ` [tip:sched/core] sched: Optimize branch hint in context_switch() tip-bot for Tim Blechmann
2009-11-24 10:55 ` [PATCH 3/5] slab.c: remove branch hint Tim Blechmann
2009-11-24 11:20   ` Ingo Molnar
2009-11-24 11:28     ` Pekka Enberg
2009-11-24 11:42       ` Ingo Molnar
2009-11-25 10:41         ` Pekka Enberg
2009-11-24 11:45       ` Tim Blechmann
2009-11-29 11:36       ` Tim Blechmann
2009-11-30  9:05         ` Pekka Enberg
2009-11-30 16:09           ` Christoph Lameter
2009-11-30 17:44             ` Pekka Enberg
2009-11-30 17:50               ` Christoph Lameter
2009-11-30 17:59               ` [PATCH] branch profiling on my nehalem machine showed 99% incorrect branch hints: Tim Blechmann
2009-12-06  8:33                 ` Pekka Enberg
2009-11-24 10:55 ` [PATCH 4/5] sched_fair.c: remove branch hint Tim Blechmann
2009-11-24 16:56   ` [tip:sched/core] sched: Optimize branch hint in pick_next_task_fair() tip-bot for Tim Blechmann
2009-11-24 10:55 ` [PATCH 5/5] workqueue.c: remove branch hint Tim Blechmann

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