From owner-svn-src-all@FreeBSD.ORG  Thu Oct 16 19:06:25 2008
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 2896110656AA;
	Thu, 16 Oct 2008 19:06:25 +0000 (UTC) (envelope-from raj@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 166288FC13;
	Thu, 16 Oct 2008 19:06:25 +0000 (UTC) (envelope-from raj@FreeBSD.org)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id m9GJ6OGM068434;
	Thu, 16 Oct 2008 19:06:24 GMT (envelope-from raj@svn.freebsd.org)
Received: (from raj@localhost)
	by svn.freebsd.org (8.14.3/8.14.3/Submit) id m9GJ6OXG068433;
	Thu, 16 Oct 2008 19:06:24 GMT (envelope-from raj@svn.freebsd.org)
Message-Id: <200810161906.m9GJ6OXG068433@svn.freebsd.org>
From: Rafal Jaworowski <raj@FreeBSD.org>
Date: Thu, 16 Oct 2008 19:06:24 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r183958 - head/sys/arm/arm
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 16 Oct 2008 19:06:25 -0000

Author: raj
Date: Thu Oct 16 19:06:24 2008
New Revision: 183958
URL: http://svn.freebsd.org/changeset/base/183958

Log:
  Eliminate flushing of L2 cache in ARM context switch routines.
  
  With VIPT L2 cache such syncing not only is redundant, but also a performance
  penalty.
  
  Pointed out by:	cognet

Modified:
  head/sys/arm/arm/swtch.S

Modified: head/sys/arm/arm/swtch.S
==============================================================================
--- head/sys/arm/arm/swtch.S	Thu Oct 16 18:09:27 2008	(r183957)
+++ head/sys/arm/arm/swtch.S	Thu Oct 16 19:06:24 2008	(r183958)
@@ -143,8 +143,6 @@ ENTRY(cpu_throw)
 	ldr	r9, .Lcpufuncs
 	mov	lr, pc
 	ldr	pc, [r9, #CF_IDCACHE_WBINV_ALL]
-	mov	lr, pc
-	ldr	pc, [r9, #CF_L2CACHE_WBINV_ALL]
 	ldr	r0, [r7, #(PCB_PL1VEC)]
 	ldr	r1, [r7, #(PCB_DACR)]
 	/*
@@ -174,8 +172,6 @@ ENTRY(cpu_throw)
 	movne	r1, #4
 	movne	lr, pc
 	ldrne	pc, [r9, #CF_DCACHE_WB_RANGE]
-	movne	lr, pc
-	ldrne	pc, [r9, #CF_L2CACHE_WB_RANGE]
 #endif /* PMAP_INCLUDE_PTE_SYNC */
 
 	/*
@@ -332,8 +328,6 @@ ENTRY(cpu_switch)
 	ldr	r1, .Lcpufuncs
 	mov	lr, pc
 	ldr	pc, [r1, #CF_IDCACHE_WBINV_ALL]
-	mov	lr, pc
-	ldr	pc, [r1, #CF_L2CACHE_WBINV_ALL]
 .Lcs_cache_purge_skipped:
 	/* rem: r6 = lock */
 	/* rem: r9 = new PCB */
@@ -366,8 +360,6 @@ ENTRY(cpu_switch)
 	mov	r1, #4
 	mov	lr, pc
 	ldr	pc, [r2, #CF_DCACHE_WB_RANGE]
-	mov	lr, pc
-	ldr	pc, [r2, #CF_L2CACHE_WB_RANGE]
 
 .Lcs_same_vector:
 #endif /* PMAP_INCLUDE_PTE_SYNC */