From owner-svn-src-projects@FreeBSD.ORG Fri May 13 15:43:57 2011 Return-Path: Delivered-To: svn-src-projects@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EBAB81065670; Fri, 13 May 2011 15:43:57 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id 5E54E8FC12; Fri, 13 May 2011 15:43:56 +0000 (UTC) Received: from deviant.kiev.zoral.com.ua (root@deviant.kiev.zoral.com.ua [10.1.1.148]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id p4DFho2X052810 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 13 May 2011 18:43:50 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.4/8.14.4) with ESMTP id p4DFhnR3054943; Fri, 13 May 2011 18:43:49 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.4/8.14.4/Submit) id p4DFhnXP054942; Fri, 13 May 2011 18:43:49 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Fri, 13 May 2011 18:43:49 +0300 From: Kostik Belousov To: Attilio Rao Message-ID: <20110513154349.GV48734@deviant.kiev.zoral.com.ua> References: <20110513221936.X1161@besplex.bde.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="xncXys66qXuJqdVV" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-3.4 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00, DNS_FROM_OPENWHOIS autolearn=no version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: src-committers@freebsd.org, Artem Belevich , Oleksandr Tymoshenko , Bruce Evans , svn-src-projects@freebsd.org, Warner Losh Subject: Re: svn commit: r221614 - projects/largeSMP/sys/powerpc/include X-BeenThere: svn-src-projects@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the src " projects" tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 May 2011 15:43:58 -0000 --xncXys66qXuJqdVV Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Fri, May 13, 2011 at 03:50:47PM +0200, Attilio Rao wrote: > The per-cpu stuff also, is read only. The pm_active objects are > protected by VM locks. pm_active is not protected by any vm lock. It is set and cleared unlocked in the context switch code. But, the ctx switch only needs to set and clear a single bit at the time of switch, that makes the atomic operations sufficient for consistency. I had a WIP on the Intel PCID, were such protection was not enough, unfortunately. --xncXys66qXuJqdVV Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iEYEARECAAYFAk3NUbUACgkQC3+MBN1Mb4gbJwCeKyYAKhfcLfcXxsdJbJ3dcjKe 1WwAnj+xlqdJ/fkHNpf4GFjFqtEAiYa1 =PXrb -----END PGP SIGNATURE----- --xncXys66qXuJqdVV--