From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05670C04AAF for ; Tue, 21 May 2019 01:43:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C7AFE2171F for ; Tue, 21 May 2019 01:43:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C7AFE2171F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=davemloft.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 645446B0003; Mon, 20 May 2019 21:43:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5F65C6B0005; Mon, 20 May 2019 21:43:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4E4B26B0006; Mon, 20 May 2019 21:43:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f71.google.com (mail-ed1-f71.google.com [209.85.208.71]) by kanga.kvack.org (Postfix) with ESMTP id 167276B0003 for ; Mon, 20 May 2019 21:43:43 -0400 (EDT) Received: by mail-ed1-f71.google.com with SMTP id p14so28153987edc.4 for ; Mon, 20 May 2019 18:43:43 -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:date :message-id:to:cc:subject:from:in-reply-to:references:mime-version :content-transfer-encoding; bh=DddwT0x8zMq9ZypXaz8ht9er9UPkaa5SLfsnPfZzPmE=; b=qotBOjF/oBR2diKdoaY6Vt2NkiegZIV5tlfWjmcnhxIEYJBrKzbFs2w0MQLSvAAzYW 1/t930WAHxffg/VpjKEdvbOo6zd6F07MHibvh/mHCMTWBsniSyduOTAkAFdnF9uYGF+H gHAriGhYq4Kt+spdMVkYQ1AXO4sg3HrQaWQfxLlkF26U0icA5Qgc4mAb8hFN40PtX5HL 1s24oIuQu5XwSFKUVBJGea3Lz7U5vZyEuRL2CIZzT8EYhzCDDlfR2C9giSvZtCWZoHRd +4i3D48WPJG73Ty1or5mO7K3YonKozAMIjGUuWETicH/uF+Kj7fYUPIxLwoc5Q+e0SvO kM+Q== X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 2620:137:e000::1:9 is neither permitted nor denied by best guess record for domain of davem@davemloft.net) smtp.mailfrom=davem@davemloft.net X-Gm-Message-State: APjAAAVqB2PlHjpT7J3SbOTyGxMVN7BaxCQaIxs32hm3odrRwst2296K vwRBqa5y9dafm0TCHdvY9pIWgUvaukI1BBjBqoF6pfjTTrlzJD454C/K9ufsb71Hx43XMflBzXV 4tuGTJ1pzEHLouD/34PNHJAjiR2CnJqx+NpSDQqABn5O1MXx0nwtvsGAjGgc4zgw= X-Received: by 2002:aa7:db0c:: with SMTP id t12mr80430545eds.170.1558403022689; Mon, 20 May 2019 18:43:42 -0700 (PDT) X-Google-Smtp-Source: APXvYqxryboEZs6xg2kVIWgB9C4uZMeWqgPhjaV2nDTOnf9/Eb/Rm18LbXFSB81Gfp76iNloxzOd X-Received: by 2002:aa7:db0c:: with SMTP id t12mr80430503eds.170.1558403021993; Mon, 20 May 2019 18:43:41 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1558403021; cv=none; d=google.com; s=arc-20160816; b=q9gUosap94/iiOAK+KhuELMb1YU9qBQKuCugORXRcgL2dPkpuHtY+5Wn7pED+opNhO 1a7jUx/QkfbWN5IdzfVbe/9fzRWXaJNl3j3EZqByOZ6ZtCbE5u1biOtuSSxvje0Gd9Hn Log8KfdZ2N8NyLFKDNay9OhNHfucvyWJ3ZZ0LRy11MctS/+0McWRs3DAnm/fYB9gkc8q bBZaarUCpgsfPQsivrk1MYw/MPkJ3gmaAxUXNqOYki0hk3lz9/mq6Z20sTO0WbVo9kOh FTKhnmyOvDJ6rNv6IGB5NNAvcc7yh63zcL4jXMFWAwNQZqDL2Osx5DYZ7AAfm7q1TTUK ZjoQ== 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:from :subject:cc:to:message-id:date; bh=DddwT0x8zMq9ZypXaz8ht9er9UPkaa5SLfsnPfZzPmE=; b=Fm3SOP7A0I7ZVG2m3qWMa1Kkov/RLDIBD5GqFtLZMEOEGrmK41zP62r8iVKYfUzsdQ keqwTDWzr06A8qCk8GWN3lk4e/VSTBXWk2MbvzkfeKieSHfWmY+64qESxYb+7+SPHDx/ i8ENsI4hVGR2p4wZgXb/2dc4MuBQE94GrURsRXOj1uG2y1CuSv4ntbuxNwW+JM3gIIFj fjbRljT9ki9oa4ai+8fw3fAXEJgMRTHVbzID0CMsQB9VDY6EimHzGIGSsrHG0tkEZR7U ew+wDdCcLxPp32YcKS0BkopEcg7UN9dYQ0Ov316IUGtWHZINK1cItJXH1GAgy+XbUmL1 GvVw== ARC-Authentication-Results: i=1; mx.google.com; spf=neutral (google.com: 2620:137:e000::1:9 is neither permitted nor denied by best guess record for domain of davem@davemloft.net) smtp.mailfrom=davem@davemloft.net Received: from shards.monkeyblade.net (shards.monkeyblade.net. [2620:137:e000::1:9]) by mx.google.com with ESMTPS id r21si9448742ejn.154.2019.05.20.18.43.41 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 May 2019 18:43:41 -0700 (PDT) Received-SPF: neutral (google.com: 2620:137:e000::1:9 is neither permitted nor denied by best guess record for domain of davem@davemloft.net) client-ip=2620:137:e000::1:9; Authentication-Results: mx.google.com; spf=neutral (google.com: 2620:137:e000::1:9 is neither permitted nor denied by best guess record for domain of davem@davemloft.net) smtp.mailfrom=davem@davemloft.net Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::3d8]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id AC23214249739; Mon, 20 May 2019 18:43:38 -0700 (PDT) Date: Mon, 20 May 2019 18:43:36 -0700 (PDT) Message-Id: <20190520.184336.743103388474716249.davem@davemloft.net> To: rick.p.edgecombe@intel.com Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, linux-mm@kvack.org, mroos@linux.ee, mingo@redhat.com, namit@vmware.com, luto@kernel.org, bp@alien8.de, netdev@vger.kernel.org, dave.hansen@intel.com, sparclinux@vger.kernel.org Subject: Re: [PATCH v2] vmalloc: Fix issues with flush flag From: David Miller In-Reply-To: References: <3e7e674c1fe094cd8dbe0c8933db18be1a37d76d.camel@intel.com> <20190520.203320.621504228022195532.davem@davemloft.net> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Mon, 20 May 2019 18:43:39 -0700 (PDT) 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: From: "Edgecombe, Rick P" Date: Tue, 21 May 2019 01:20:33 +0000 > Should it handle executing an unmapped page gracefully? Because this > change is causing that to happen much earlier. If something was relying > on a cached translation to execute something it could find the mapping > disappear. Does this work by not mapping any kernel mappings at the beginning, and then filling in the BPF mappings in response to faults?