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[70.30.145.63]) by smtp.gmail.com with ESMTPSA id t23-20020a02ccb7000000b003c51aab9d88sm574690jap.159.2023.02.17.08.03.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Feb 2023 08:03:53 -0800 (PST) Date: Fri, 17 Feb 2023 11:03:52 -0500 From: Peter Xu To: Muhammad Usama Anjum Cc: Paul Gofman , david@redhat.com, Andrew Morton , kernel@collabora.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/2] mm/userfaultfd: Support WP on multiple VMAs Message-ID: References: <9f0278d7-54f1-960e-ffdf-eeb2572ff6d1@collabora.com> <0549bd0e-85c4-1547-3eaa-16c8a8883837@collabora.com> <5f234d04-684e-9338-44b6-df23f7166578@collabora.com> MIME-Version: 1.0 In-Reply-To: <5f234d04-684e-9338-44b6-df23f7166578@collabora.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 650C940031 X-Stat-Signature: g4tcxfmwwy8gs1sazoby6okuhaekftxx X-Rspam-User: X-HE-Tag: 1676649837-596896 X-HE-Meta: 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 is0N1D+D 4A3hJKwaIDDH+GtvJ6uN64PcZ1TgZiDjmcq4Y+avv/d0QXO/XxpcrMZVBBywD5SWDpbNwHXa9sBP5/AUMK6vx9x6pgqPZdTKpAInNu2nf46tGOXwLwLiYqHiqZEBbPrwhTSKuVfTsOzm7wSY6StAJhjgYWnjiFVMIG5Xl6qOjhLwkJybvqs3XluwDq6ZTCRfMMvpCPGQsRSXm+gpwNA67kaKJzZFAp65NbjlG9pFCUjbpMnlrAgJhmZmG9gGYw89fo4AegaFqhyRoIssiJwrBq0475yh55PIe3sveMME47lDj2D5IUtA/F8HwHltXqdWnRLgohIXK2ggV3H2WfukM/ajYf3EPVyla2zrByNp+t9KA3J6rPugMfy9lD38Fra6WNFgO X-Bogosity: Ham, tests=bogofilter, spamicity=0.014704, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Feb 17, 2023 at 03:59:25PM +0500, Muhammad Usama Anjum wrote: > > But what if the user wants to do that during when you're tracing it using > > userfaultfd? Can it happen? > Sorry, I've not tested tracing. No worry. It's not a request to test tracing; it's more or less to make sure it works for you if it cannot trace a program that uses uffd. If it's not a problem to you, then it's not a problem to me either. And it's not anything special to async but in general to uffd. Thanks, -- Peter Xu