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Thu, 14 Mar 2024 05:54:01 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFDKFAcy0D0RZIBzW/ijnDnKbSAtNbNy7aeKjfEkMPENW2gRJ/JKFObLbnjKUsRDl/qV6I7cQ== X-Received: by 2002:a05:6214:568b:b0:690:de72:316f with SMTP id qm11-20020a056214568b00b00690de72316fmr1649061qvb.1.1710420841118; Thu, 14 Mar 2024 05:54:01 -0700 (PDT) Received: from x1n ([99.254.121.117]) by smtp.gmail.com with ESMTPSA id kd13-20020a056214400d00b0068ff79d8d97sm409217qvb.41.2024.03.14.05.53.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Mar 2024 05:54:00 -0700 (PDT) Date: Thu, 14 Mar 2024 08:53:57 -0400 From: Peter Xu To: Christophe Leroy Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf() Message-ID: References: <20240313214719.253873-1-peterx@redhat.com> <20240313214719.253873-10-peterx@redhat.com> <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> MIME-Version: 1.0 In-Reply-To: <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Muchun Song , "x86@kernel.org" , Nicholas Piggin , "linux-kernel@vger.kernel.org" , Matthew Wilcox , "Naveen N. Rao" , "Aneesh Kumar K.V" , "linux-mm@kvack.org" , Mike Rapoport , Jason Gunthorpe , "sparclinux@vger.kernel.org" , Andrew Morton , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Mar 14, 2024 at 08:45:34AM +0000, Christophe Leroy wrote: > > > Le 13/03/2024 à 22:47, peterx@redhat.com a écrit : > > From: Peter Xu > > > > PowerPC book3s 4K mostly has the same definition on both, except pXd_huge() > > constantly returns 0 for hash MMUs. As Michael Ellerman pointed out [1], > > it is safe to check _PAGE_PTE on hash MMUs, as the bit will never be set so > > it will keep returning false. > > > > As a reference, __p[mu]d_mkhuge() will trigger a BUG_ON trying to create > > such huge mappings for 4K hash MMUs. Meanwhile, the major powerpc hugetlb > > pgtable walker __find_linux_pte() already used pXd_leaf() to check hugetlb > > mappings. > > > > The goal should be that we will have one API pXd_leaf() to detect all kinds > > of huge mappings. AFAICT we need to use the pXd_leaf() impl (rather than > > pXd_huge() ones) to make sure ie. THPs on hash MMU will also return true. > > All kinds of huge mappings ? > > pXd_leaf() will detect only leaf mappings (like pXd_huge() ). There are > also huge mappings through hugepd. On powerpc 8xx we have 8M huge pages > and 512k huge pages. A PGD entry covers 4M so pgd_leaf() won't report > those huge pages. Ah yes, I should always mention this is in the context of leaf huge pages only. Are the examples you provided all fall into hugepd category? If so I can reword the commit message, as: As a reference, __p[mu]d_mkhuge() will trigger a BUG_ON trying to create such huge mappings for 4K hash MMUs. Meanwhile, the major powerpc hugetlb pgtable walker __find_linux_pte() already used pXd_leaf() to check leaf hugetlb mappings. The goal should be that we will have one API pXd_leaf() to detect all kinds of huge mappings except hugepd. AFAICT we need to use the pXd_leaf() impl (rather than pXd_huge() ones) to make sure ie. THPs on hash MMU will also return true. Does this look good to you? Thanks, -- Peter Xu From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E7293A8D8 for ; Thu, 14 Mar 2024 12:54:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710420846; cv=none; b=g/O1FaSinpnE7h75IdAo6/4Z6+O8AhmdJvobxjp8xD581HTAJayI44wMjVqOScmiTdYYv0yx0VtK3qLo2d2HpIKz3VdU5PVN+V+yBKw9erbW6R48pPtzVGeY2F/QO7E3GwuIdcl2jPyIdOprZ+79OknDxJm2xu/eQ0kVYB2R9R0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710420846; c=relaxed/simple; bh=VP8+Z7Ov4O9DzuKaTY4W+WBGCtvu2iJHFLZOUXvTs0g=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=EDSpgET4ukpou0+qiRg2Orm0WhlNFbVMHvDCnlV4MZkNiEtko/eMlZpG/qQRmcNthTNXQS5s4Kb7TcVXw/4A6jeYHkpwZ0oEFcZzEIg6ol//wMvSWWAFTpqDQfTHY46FElgfeq3YAk4asq1tdTDx5VN3gVMwWFeo4gWAME6GXck= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=GJEzbgW3; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GJEzbgW3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1710420843; h=from:from: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; bh=BZxWk5KkUQhQXZEGGdHKASVJGou5PrPdHxO3BmOv5tM=; b=GJEzbgW3NvzdmOuKkHmVPPUVsRiQubmNeTj2O/0ogg6WFtLTnxBslrMsm31Rj0ZEXebe27 qNnmIj3BS0Ix3e20hgLqlk6KYJi/tG1ebFmMp+enVRKY3K21EfZktqbY454EMfuZxG4hva 8Zsyq8iBpU0qMHJASa6nOiJ07ssAjq8= Received: from mail-qv1-f70.google.com (mail-qv1-f70.google.com [209.85.219.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-642-s7SxWCmEMb-wxJlzp-LtHA-1; Thu, 14 Mar 2024 08:54:02 -0400 X-MC-Unique: s7SxWCmEMb-wxJlzp-LtHA-1 Received: by mail-qv1-f70.google.com with SMTP id 6a1803df08f44-6818b8cb840so3001326d6.1 for ; Thu, 14 Mar 2024 05:54:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710420841; x=1711025641; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=BZxWk5KkUQhQXZEGGdHKASVJGou5PrPdHxO3BmOv5tM=; b=b3RuCp1TL1XdItN9MVzvpLNOfFUwbEviRZEqyJb3Bmc1TVZf3LrMkyoDFvnzMMZufC Wg/gQy0uR01PbyWDzkrgwHrxzW/rSCI8FarQgttJyWydLu+ZIEq9kM68HO7s7LDITcJJ fX5RlA0di8m8ivmyiLWcX/oPJJme0zzaWjs8zNGvKVKdmnhAllnxZ69CpYu2x77GSyLW xDQC3XGxnCV8jJgHh2iEBh07PrJ8qBK+cv6JQ/7+Cy16sPhwUpyr4r+6LpZef3YNrasd S553tP3VUFbNN0nC08Ad+K2ZdbzPeLnbKIyOjF01pDpXZ4kx02ePINBQrxzcxb3wzZMU /70w== X-Forwarded-Encrypted: i=1; AJvYcCUQzNvH9ig/vI4MqYbtJT2b41dQGjjyy5PIgKTouRz0NMZisQ78y9cQNzmECSkeP3S4VDcYlOyEGLIobboRgpKbt5GNuh9egh+6ug== X-Gm-Message-State: AOJu0Yxm8EMlLRw3IsZHsFJ7XYvCLnQttFo9rdT+aPUcJcmcsIX1gdwK QpsFI0r3+UoGlaBquHbihwKtsikQ8gHEUW/VAIGz23WH+BYJr5pEFJgGn2j4UYmfgTGqfMZqeQl JhHzb0kwJJQEzdN5TkH0yEeV/+pws4rBtCzRsDhYr0WgCd0aF65ueo/kFq44= X-Received: by 2002:a05:6214:568b:b0:690:de72:316f with SMTP id qm11-20020a056214568b00b00690de72316fmr1649077qvb.1.1710420841558; Thu, 14 Mar 2024 05:54:01 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFDKFAcy0D0RZIBzW/ijnDnKbSAtNbNy7aeKjfEkMPENW2gRJ/JKFObLbnjKUsRDl/qV6I7cQ== X-Received: by 2002:a05:6214:568b:b0:690:de72:316f with SMTP id qm11-20020a056214568b00b00690de72316fmr1649061qvb.1.1710420841118; Thu, 14 Mar 2024 05:54:01 -0700 (PDT) Received: from x1n ([99.254.121.117]) by smtp.gmail.com with ESMTPSA id kd13-20020a056214400d00b0068ff79d8d97sm409217qvb.41.2024.03.14.05.53.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Mar 2024 05:54:00 -0700 (PDT) Date: Thu, 14 Mar 2024 08:53:57 -0400 From: Peter Xu To: Christophe Leroy Cc: "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-arm-kernel@lists.infradead.org" , Matthew Wilcox , "linuxppc-dev@lists.ozlabs.org" , Andrew Morton , "x86@kernel.org" , Mike Rapoport , Muchun Song , "sparclinux@vger.kernel.org" , Jason Gunthorpe , Michael Ellerman , Nicholas Piggin , "Aneesh Kumar K.V" , "Naveen N. Rao" Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf() Message-ID: References: <20240313214719.253873-1-peterx@redhat.com> <20240313214719.253873-10-peterx@redhat.com> <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> Precedence: bulk X-Mailing-List: sparclinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> On Thu, Mar 14, 2024 at 08:45:34AM +0000, Christophe Leroy wrote: > > > Le 13/03/2024 à 22:47, peterx@redhat.com a écrit : > > From: Peter Xu > > > > PowerPC book3s 4K mostly has the same definition on both, except pXd_huge() > > constantly returns 0 for hash MMUs. As Michael Ellerman pointed out [1], > > it is safe to check _PAGE_PTE on hash MMUs, as the bit will never be set so > > it will keep returning false. > > > > As a reference, __p[mu]d_mkhuge() will trigger a BUG_ON trying to create > > such huge mappings for 4K hash MMUs. Meanwhile, the major powerpc hugetlb > > pgtable walker __find_linux_pte() already used pXd_leaf() to check hugetlb > > mappings. > > > > The goal should be that we will have one API pXd_leaf() to detect all kinds > > of huge mappings. AFAICT we need to use the pXd_leaf() impl (rather than > > pXd_huge() ones) to make sure ie. THPs on hash MMU will also return true. > > All kinds of huge mappings ? > > pXd_leaf() will detect only leaf mappings (like pXd_huge() ). There are > also huge mappings through hugepd. On powerpc 8xx we have 8M huge pages > and 512k huge pages. A PGD entry covers 4M so pgd_leaf() won't report > those huge pages. Ah yes, I should always mention this is in the context of leaf huge pages only. Are the examples you provided all fall into hugepd category? If so I can reword the commit message, as: As a reference, __p[mu]d_mkhuge() will trigger a BUG_ON trying to create such huge mappings for 4K hash MMUs. Meanwhile, the major powerpc hugetlb pgtable walker __find_linux_pte() already used pXd_leaf() to check leaf hugetlb mappings. The goal should be that we will have one API pXd_leaf() to detect all kinds of huge mappings except hugepd. AFAICT we need to use the pXd_leaf() impl (rather than pXd_huge() ones) to make sure ie. THPs on hash MMU will also return true. Does this look good to you? 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Rao" Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf() Message-ID: References: <20240313214719.253873-1-peterx@redhat.com> <20240313214719.253873-10-peterx@redhat.com> <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> MIME-Version: 1.0 In-Reply-To: <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240314_055405_011200_B4AAB12C X-CRM114-Status: GOOD ( 16.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVGh1LCBNYXIgMTQsIDIwMjQgYXQgMDg6NDU6MzRBTSArMDAwMCwgQ2hyaXN0b3BoZSBMZXJv eSB3cm90ZToKPiAKPiAKPiBMZSAxMy8wMy8yMDI0IMOgIDIyOjQ3LCBwZXRlcnhAcmVkaGF0LmNv bSBhIMOpY3JpdMKgOgo+ID4gRnJvbTogUGV0ZXIgWHUgPHBldGVyeEByZWRoYXQuY29tPgo+ID4g Cj4gPiBQb3dlclBDIGJvb2szcyA0SyBtb3N0bHkgaGFzIHRoZSBzYW1lIGRlZmluaXRpb24gb24g Ym90aCwgZXhjZXB0IHBYZF9odWdlKCkKPiA+IGNvbnN0YW50bHkgcmV0dXJucyAwIGZvciBoYXNo IE1NVXMuICBBcyBNaWNoYWVsIEVsbGVybWFuIHBvaW50ZWQgb3V0IFsxXSwKPiA+IGl0IGlzIHNh ZmUgdG8gY2hlY2sgX1BBR0VfUFRFIG9uIGhhc2ggTU1VcywgYXMgdGhlIGJpdCB3aWxsIG5ldmVy IGJlIHNldCBzbwo+ID4gaXQgd2lsbCBrZWVwIHJldHVybmluZyBmYWxzZS4KPiA+IAo+ID4gQXMg YSByZWZlcmVuY2UsIF9fcFttdV1kX21raHVnZSgpIHdpbGwgdHJpZ2dlciBhIEJVR19PTiB0cnlp bmcgdG8gY3JlYXRlCj4gPiBzdWNoIGh1Z2UgbWFwcGluZ3MgZm9yIDRLIGhhc2ggTU1Vcy4gIE1l YW53aGlsZSwgdGhlIG1ham9yIHBvd2VycGMgaHVnZXRsYgo+ID4gcGd0YWJsZSB3YWxrZXIgX19m aW5kX2xpbnV4X3B0ZSgpIGFscmVhZHkgdXNlZCBwWGRfbGVhZigpIHRvIGNoZWNrIGh1Z2V0bGIK PiA+IG1hcHBpbmdzLgo+ID4gCj4gPiBUaGUgZ29hbCBzaG91bGQgYmUgdGhhdCB3ZSB3aWxsIGhh dmUgb25lIEFQSSBwWGRfbGVhZigpIHRvIGRldGVjdCBhbGwga2luZHMKPiA+IG9mIGh1Z2UgbWFw cGluZ3MuICBBRkFJQ1Qgd2UgbmVlZCB0byB1c2UgdGhlIHBYZF9sZWFmKCkgaW1wbCAocmF0aGVy IHRoYW4KPiA+IHBYZF9odWdlKCkgb25lcykgdG8gbWFrZSBzdXJlIGllLiBUSFBzIG9uIGhhc2gg TU1VIHdpbGwgYWxzbyByZXR1cm4gdHJ1ZS4KPiAKPiBBbGwga2luZHMgb2YgaHVnZSBtYXBwaW5n cyA/Cj4gCj4gcFhkX2xlYWYoKSB3aWxsIGRldGVjdCBvbmx5IGxlYWYgbWFwcGluZ3MgKGxpa2Ug cFhkX2h1Z2UoKSApLiBUaGVyZSBhcmUgCj4gYWxzbyBodWdlIG1hcHBpbmdzIHRocm91Z2ggaHVn ZXBkLiBPbiBwb3dlcnBjIDh4eCB3ZSBoYXZlIDhNIGh1Z2UgcGFnZXMgCj4gYW5kIDUxMmsgaHVn ZSBwYWdlcy4gQSBQR0QgZW50cnkgY292ZXJzIDRNIHNvIHBnZF9sZWFmKCkgd29uJ3QgcmVwb3J0 IAo+IHRob3NlIGh1Z2UgcGFnZXMuCgpBaCB5ZXMsIEkgc2hvdWxkIGFsd2F5cyBtZW50aW9uIHRo aXMgaXMgaW4gdGhlIGNvbnRleHQgb2YgbGVhZiBodWdlIHBhZ2VzCm9ubHkuICBBcmUgdGhlIGV4 YW1wbGVzIHlvdSBwcm92aWRlZCBhbGwgZmFsbCBpbnRvIGh1Z2VwZCBjYXRlZ29yeT8gIElmIHNv CkkgY2FuIHJld29yZCB0aGUgY29tbWl0IG1lc3NhZ2UsIGFzOgoKICAgICAgICBBcyBhIHJlZmVy ZW5jZSwgX19wW211XWRfbWtodWdlKCkgd2lsbCB0cmlnZ2VyIGEgQlVHX09OIHRyeWluZyB0bwog ICAgICAgIGNyZWF0ZSBzdWNoIGh1Z2UgbWFwcGluZ3MgZm9yIDRLIGhhc2ggTU1Vcy4gIE1lYW53 aGlsZSwgdGhlIG1ham9yCiAgICAgICAgcG93ZXJwYyBodWdldGxiIHBndGFibGUgd2Fsa2VyIF9f ZmluZF9saW51eF9wdGUoKSBhbHJlYWR5IHVzZWQKICAgICAgICBwWGRfbGVhZigpIHRvIGNoZWNr IGxlYWYgaHVnZXRsYiBtYXBwaW5ncy4KCiAgICAgICAgVGhlIGdvYWwgc2hvdWxkIGJlIHRoYXQg d2Ugd2lsbCBoYXZlIG9uZSBBUEkgcFhkX2xlYWYoKSB0byBkZXRlY3QKICAgICAgICBhbGwga2lu ZHMgb2YgaHVnZSBtYXBwaW5ncyBleGNlcHQgaHVnZXBkLiAgQUZBSUNUIHdlIG5lZWQgdG8gdXNl CiAgICAgICAgdGhlIHBYZF9sZWFmKCkgaW1wbCAocmF0aGVyIHRoYW4gcFhkX2h1Z2UoKSBvbmVz KSB0byBtYWtlIHN1cmUKICAgICAgICBpZS4gVEhQcyBvbiBoYXNoIE1NVSB3aWxsIGFsc28gcmV0 dXJuIHRydWUuCgpEb2VzIHRoaXMgbG9vayBnb29kIHRvIHlvdT8KClRoYW5rcywKCi0tIApQZXRl ciBYdQoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxp bnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFk ZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4 LWFybS1rZXJuZWwK