From owner-svn-src-head@freebsd.org  Sun Jun 25 13:22:50 2017
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 78403D9178B;
 Sun, 25 Jun 2017 13:22:50 +0000 (UTC)
 (envelope-from andrew@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 487876EC8A;
 Sun, 25 Jun 2017 13:22:50 +0000 (UTC)
 (envelope-from andrew@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v5PDMnJg019823;
 Sun, 25 Jun 2017 13:22:49 GMT (envelope-from andrew@FreeBSD.org)
Received: (from andrew@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v5PDMnmh019822;
 Sun, 25 Jun 2017 13:22:49 GMT (envelope-from andrew@FreeBSD.org)
Message-Id: <201706251322.v5PDMnmh019822@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: andrew set sender to
 andrew@FreeBSD.org using -f
From: Andrew Turner <andrew@FreeBSD.org>
Date: Sun, 25 Jun 2017 13:22:49 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r320328 - head/sys/arm64/arm64
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 25 Jun 2017 13:22:50 -0000

Author: andrew
Date: Sun Jun 25 13:22:49 2017
New Revision: 320328
URL: https://svnweb.freebsd.org/changeset/base/320328

Log:
  Stop calling cpu_dcache_wb_range from PTE_SYNC.
  
  We set the shareability attributes in TCR_EL1 on boot. These tell the
  hardware the pagetables are in cached memory so there is no need to flush
  the entries from the cache to memory.
  
  This has about 4.2% improvement in system time and 2.7% improvement in
  user time for a buildkernel -j48 on a ThunderX.
  
  Keep the old code for now to allow for further comparisons.

Modified:
  head/sys/arm64/arm64/pmap.c

Modified: head/sys/arm64/arm64/pmap.c
==============================================================================
--- head/sys/arm64/arm64/pmap.c	Sun Jun 25 11:31:39 2017	(r320327)
+++ head/sys/arm64/arm64/pmap.c	Sun Jun 25 13:22:49 2017	(r320328)
@@ -504,7 +504,11 @@ pmap_l3_valid(pt_entry_t l3)
 
 CTASSERT(L1_BLOCK == L2_BLOCK);
 
+#if 0
 #define	PTE_SYNC(pte)	cpu_dcache_wb_range((vm_offset_t)pte, sizeof(*pte))
+#else
+#define	PTE_SYNC(pte)	(void)0
+#endif
 
 /*
  * Checks if the page is dirty. We currently lack proper tracking of this on