From patchwork Wed Jul 24 05:58:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 11056119 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 621111399 for ; Wed, 24 Jul 2019 06:14:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 509702876D for ; Wed, 24 Jul 2019 06:14:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 40DA528774; Wed, 24 Jul 2019 06:14:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AA1502876D for ; Wed, 24 Jul 2019 06:14:21 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E3FDA8E0005; Wed, 24 Jul 2019 02:14:20 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id DEF528E0002; Wed, 24 Jul 2019 02:14:20 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CB7E78E0005; Wed, 24 Jul 2019 02:14:20 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) by kanga.kvack.org (Postfix) with ESMTP id 7D0528E0002 for ; Wed, 24 Jul 2019 02:14:20 -0400 (EDT) Received: by mail-ed1-f70.google.com with SMTP id e9so18441693edv.18 for ; Tue, 23 Jul 2019 23:14:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=KNvQCbzGXI/XoQciu2chauD/yJmJpreVXpqKbZidQGg=; b=RSq0cTMYPyzEap1TNK9LKlmUpSsWEggq5M97iLxTNzZECNMnwTvGv1QvxnWHDiq+my rl/YUef5N7qswiNbsgb2jKxRllvIWA3A2QKUSZ7VBs7EzeVt8eiRYS3q/jnHqFtM5+3Y 3Fpr0vPR7UZveByf5NeQTxIUk2qpFI2dmzm9DL4j9eZH1JQRkCl/wg1p3fMIr1DEC1BM 8PIoO9vdFSkYG5j9BFYWXPoHMzZn+DbE7lkoU4CoB0ohvnGjSiFT/JkBkTMEJ+QYEsCz OMbUaYGpPE1jNqhl629XX7ODL3GkW4UkN17cXY3T1fEsk3XMTGRnnnpQ5lu5RpQ6O+kb U7HQ== X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 217.70.183.196 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) smtp.mailfrom=alex@ghiti.fr X-Gm-Message-State: APjAAAX0FO+0P4fwl/hfDc/sq/jbNVXfufCZ7XPhLucHPdM4PWtYy4bH 5gEXaOUG467ELN2LDfyEAi6eveYSFTiYVLh7svn2Vsj26STyzPpS76yEaZ7k5D91m+3wVrm2mGU eLgauKiwZfYWS8vrlT2vfd3LKQKqahwkWhPVZJlXq44ON/bUJY7GNz+Z43DEci7I= X-Received: by 2002:a17:906:27c7:: with SMTP id k7mr61522881ejc.91.1563948860086; Tue, 23 Jul 2019 23:14:20 -0700 (PDT) X-Google-Smtp-Source: APXvYqxfd64nXQ1CO5yoXY3vUD9KBPb/TzoX+cdrx09+RZ017StIg7uwLbPt1++OhE7+pZwHVIdi X-Received: by 2002:a17:906:27c7:: with SMTP id k7mr61522836ejc.91.1563948859203; Tue, 23 Jul 2019 23:14:19 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563948859; cv=none; d=google.com; s=arc-20160816; b=EOGkim58hskW0gje9yINcxamLy0oshpJm+NZaA0j7FLHyJD4AVAi5qcK/wzMOMh0pm m4ELDzd71CsYxrtKqh9fGmIcyfRxPlD+bjVcdJrVkIczZXnJrkSwWFPen6ejUHe+ubWH /pg4GabU7nqRNKIGvtY5p4RsRxuaLKvdo67m1sL1TGV2EGRxNVrwcS45yZSPa2atLq5P PMnUH5vyOg9LWUfO5bv4HAHBMJkhqDwDSTEAl7V4TrJpwMxsNMlcb5V64qjdcvhxkl+M DYR+tuXs4dzCKP7TW8p/Oc+X0ksOQYwQqwNtOdT0lgWH1LmaYeSpdWoXcyg0g+Rfvjxy whsw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=KNvQCbzGXI/XoQciu2chauD/yJmJpreVXpqKbZidQGg=; b=AoJzaeoGRkH6zAGeGDksNPbfLbbGlUL09/dapC+M3I1MhW8cZk2tbsFM+PYQ5XlCkP IA8c5GUmqTF3tcHvJifBJmXuJqa+0VgUrx4PJU1IYFwmEIXivMsvjc09U6nGexrnkTaS npR3Ot2GnuV1v5vWs8KKCGRipx2VIbf+y5iCpJFbucEw4PmkdvrpMsa7agoBhFVUtXx+ 0kYT8DDsz/lWFVLKWqvnV7I6k8yJWUZ0zjAXVSL1J837ovXkD64R+1JZCxI+XGYC9otW wQ1+ZGRC++KlDQ0qpDElb0TUftLqBesK1/1OE+NjpRtgwsaYoyJcBbNLdCXZYoMmIhAH xxHg== ARC-Authentication-Results: i=1; mx.google.com; spf=neutral (google.com: 217.70.183.196 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) smtp.mailfrom=alex@ghiti.fr Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net. [217.70.183.196]) by mx.google.com with ESMTPS id z2si8764419edz.118.2019.07.23.23.14.19 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 23 Jul 2019 23:14:19 -0700 (PDT) Received-SPF: neutral (google.com: 217.70.183.196 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) client-ip=217.70.183.196; Authentication-Results: mx.google.com; spf=neutral (google.com: 217.70.183.196 is neither permitted nor denied by best guess record for domain of alex@ghiti.fr) smtp.mailfrom=alex@ghiti.fr X-Originating-IP: 79.86.19.127 Received: from alex.numericable.fr (127.19.86.79.rev.sfr.net [79.86.19.127]) (Authenticated sender: alex@ghiti.fr) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id D50ADE0004; Wed, 24 Jul 2019 06:14:14 +0000 (UTC) From: Alexandre Ghiti To: Andrew Morton Cc: Christoph Hellwig , Russell King , Catalin Marinas , Will Deacon , Ralf Baechle , Paul Burton , James Hogan , Palmer Dabbelt , Albert Ou , Alexander Viro , Luis Chamberlain , Kees Cook , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Alexandre Ghiti Subject: [PATCH REBASE v4 14/14] riscv: Make mmap allocation top-down by default Date: Wed, 24 Jul 2019 01:58:50 -0400 Message-Id: <20190724055850.6232-15-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190724055850.6232-1-alex@ghiti.fr> References: <20190724055850.6232-1-alex@ghiti.fr> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP In order to avoid wasting user address space by using bottom-up mmap allocation scheme, prefer top-down scheme when possible. Before: root@qemuriscv64:~# cat /proc/self/maps 00010000-00016000 r-xp 00000000 fe:00 6389 /bin/cat.coreutils 00016000-00017000 r--p 00005000 fe:00 6389 /bin/cat.coreutils 00017000-00018000 rw-p 00006000 fe:00 6389 /bin/cat.coreutils 00018000-00039000 rw-p 00000000 00:00 0 [heap] 1555556000-155556d000 r-xp 00000000 fe:00 7193 /lib/ld-2.28.so 155556d000-155556e000 r--p 00016000 fe:00 7193 /lib/ld-2.28.so 155556e000-155556f000 rw-p 00017000 fe:00 7193 /lib/ld-2.28.so 155556f000-1555570000 rw-p 00000000 00:00 0 1555570000-1555572000 r-xp 00000000 00:00 0 [vdso] 1555574000-1555576000 rw-p 00000000 00:00 0 1555576000-1555674000 r-xp 00000000 fe:00 7187 /lib/libc-2.28.so 1555674000-1555678000 r--p 000fd000 fe:00 7187 /lib/libc-2.28.so 1555678000-155567a000 rw-p 00101000 fe:00 7187 /lib/libc-2.28.so 155567a000-15556a0000 rw-p 00000000 00:00 0 3fffb90000-3fffbb1000 rw-p 00000000 00:00 0 [stack] After: root@qemuriscv64:~# cat /proc/self/maps 00010000-00016000 r-xp 00000000 fe:00 6389 /bin/cat.coreutils 00016000-00017000 r--p 00005000 fe:00 6389 /bin/cat.coreutils 00017000-00018000 rw-p 00006000 fe:00 6389 /bin/cat.coreutils 2de81000-2dea2000 rw-p 00000000 00:00 0 [heap] 3ff7eb6000-3ff7ed8000 rw-p 00000000 00:00 0 3ff7ed8000-3ff7fd6000 r-xp 00000000 fe:00 7187 /lib/libc-2.28.so 3ff7fd6000-3ff7fda000 r--p 000fd000 fe:00 7187 /lib/libc-2.28.so 3ff7fda000-3ff7fdc000 rw-p 00101000 fe:00 7187 /lib/libc-2.28.so 3ff7fdc000-3ff7fe2000 rw-p 00000000 00:00 0 3ff7fe4000-3ff7fe6000 r-xp 00000000 00:00 0 [vdso] 3ff7fe6000-3ff7ffd000 r-xp 00000000 fe:00 7193 /lib/ld-2.28.so 3ff7ffd000-3ff7ffe000 r--p 00016000 fe:00 7193 /lib/ld-2.28.so 3ff7ffe000-3ff7fff000 rw-p 00017000 fe:00 7193 /lib/ld-2.28.so 3ff7fff000-3ff8000000 rw-p 00000000 00:00 0 3fff888000-3fff8a9000 rw-p 00000000 00:00 0 [stack] Signed-off-by: Alexandre Ghiti Reviewed-by: Christoph Hellwig Reviewed-by: Kees Cook --- arch/riscv/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 59a4727ecd6c..6a63973873fd 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -54,6 +54,17 @@ config RISCV select EDAC_SUPPORT select ARCH_HAS_GIGANTIC_PAGE select ARCH_WANT_HUGE_PMD_SHARE if 64BIT + select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU + select HAVE_ARCH_MMAP_RND_BITS + +config ARCH_MMAP_RND_BITS_MIN + default 18 + +# max bits determined by the following formula: +# VA_BITS - PAGE_SHIFT - 3 +config ARCH_MMAP_RND_BITS_MAX + default 33 if 64BIT # SV48 based + default 18 config MMU def_bool y