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(p200300d82f0dba00c95131d7b2b08ba0.dip0.t-ipconnect.de. [2003:d8:2f0d:ba00:c951:31d7:b2b0:8ba0]) by smtp.gmail.com with ESMTPSA id w3-20020a05600018c300b002206203ed3dsm9771415wrq.29.2022.09.05.09.09.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Sep 2022 09:09:05 -0700 (PDT) Message-ID: <362e6361-e2b7-16eb-83c8-203738f7b5d0@redhat.com> Date: Mon, 5 Sep 2022 18:09:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.0 Subject: Re: [PATCH] hugetlb: simplify hugetlb handling in follow_page_mask To: Christophe Leroy , Mike Kravetz Cc: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-ia64@vger.kernel.org" , Baolin Wang , "Aneesh Kumar K . V" , Naoya Horiguchi , Michael Ellerman , Muchun Song , Andrew Morton , "linuxppc-dev@lists.ozlabs.org" References: <20220829234053.159158-1-mike.kravetz@oracle.com> <608934d4-466d-975e-6458-34a91ccb4669@redhat.com> <739dc825-ece3-a59f-adc5-65861676e0ae@redhat.com> <323fdb0f-c5a5-e0e5-1ff4-ab971bc295cc@redhat.com> <5f6a7c6b-5073-f050-8dae-6ee279a8bb0b@redhat.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=VFWYFgbu; spf=pass (imf15.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1662394149; a=rsa-sha256; cv=none; b=GXRw5xudxpGkBdgOLDpAA5xG7//AeE5pOKLHsJ6Rh+XeWMdMiZBF1A5Wt1E4AAnroI29EE M1/tFCrSKZ0HfBNFKFYxZLWS/aLGj/UZbAZknJThpJk8W/Aaw54ZPxQ5grkCutBZphsJEK MlVT/P4qkn0uTISzPVsy/3aGj4++yxA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1662394149; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=HvFO3QtE1Se36l/1RKgnERmp1CkIVhI/og6sBHbBfFQ=; b=tVaAh7u7zRHJjCrxsTz/jTHSiamooFJF/WHopOPxCIE/6CU/HfEl8eVXViP8m1UMIAtPIp BvWutkp6D2gp4WlGkwKIqS6rp45KkBbwT35SKUlv4DFvJZvRXHhEW4PJC7iSHPspykosHU wKjDLleDGDvpcsAd3eut4p+ZBSUTbaw= X-Rspam-User: Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=VFWYFgbu; spf=pass (imf15.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: B2AB3A0064 X-Stat-Signature: f5mtgtuxoedq4dxoz9u1x18hw6dwoquj X-HE-Tag: 1662394148-181386 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: > Yes I think the assumption is correct for user pages hence for GUP. > > By the way the discussion started with PTDUMP. For PTDUMP we need huge > page directories to be taken into account. And for anything that > involves kernel pages like VMAP or VMALLOC. Yes, makes perfect sense to me now that you explained how/where hugepd is actually used -- thanks! -- Thanks, David / dhildenb