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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 , "Aneesh Kumar K.V" , "x86@kernel.org" , Nicholas Piggin , "linux-kernel@vger.kernel.org" , Matthew Wilcox , "Naveen N. Rao" , "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 Wed, Mar 20, 2024 at 05:40:39PM +0000, Christophe Leroy wrote: > > > Le 20/03/2024 à 17:09, Peter Xu a écrit : > > On Wed, Mar 20, 2024 at 06:16:43AM +0000, Christophe Leroy wrote: > >> At the first place that was to get a close fit between hardware > >> pagetable topology and linux pagetable topology. But obviously we > >> already stepped back for 512k pages, so let's go one more step aside and > >> do similar with 8M pages. > >> > >> I'll give it a try and see how it goes. > > > > So you're talking about 8M only for 8xx, am I right? > > Yes I am. > > > > > There seem to be other PowerPC systems use hugepd. Is it possible that we > > convert all hugepd into cont_pte form? > > Indeed. > > Seems like we have hugepd for book3s/64 and for nohash. > > For book3s I don't know, may Aneesh can answer. > > For nohash I think it should be possible because TLB misses are handled > by software. Even the e6500 which has a hardware tablewalk falls back on > software walk when it is a hugepage IIUC. It'll be great if I can get some answer here, and then I know the path for hugepd in general. I don't want to add any new code into core mm to something destined to fade away soon. One option for me is I can check a macro of hugepd existance, so all new code will only work when hugepd is not supported on such arch. However that'll start to make some PowerPC systems special (which I still tried hard to avoid, if that wasn't proved in the past..), meanwhile we'll also need to keep some generic-mm paths (that I can already remove along with the new code) only for these hugepd systems. But it's still okay to me, it'll be just a matter of when to drop those codes, sooner or later. 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 [170.10.129.124]) (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 355E729CE8 for ; Wed, 20 Mar 2024 20:24:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710966274; cv=none; b=t0vVys/eraK0vgzXQittNC9yoPnvbpcQviCfzRr1VDSoNaSF8a0WoKeAR2JjhsnKJ8mWrASEIBuxu9LzekB0FacXwMUZFSyGqFtE1ycJK2CUEdSQ0bH36TW4EKpxHxlI1nML5OREsjPAKCiGCybvYSTC3SBifUxOMfaU941A5o8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710966274; c=relaxed/simple; bh=M4q/YYp0qcs/a4m55jxwo1bG/2xhK+JzK1SSgdwqTnY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JQSJCP31dRlKy2nVCmWLY9CGlODkCcpzAj2lFVh8nKSmDCrycRBpqeKsE1bId4eizDa9FYkR29A9S2fMqr27PPwEgKJkQFJMsScSi32KhJy56kCK8xb3eq5Ch6To+/SXVsZL6T7gBY66sN+HWqi3U0qdGXTziaANWxfJ062U1pI= 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=NA1vW6IZ; arc=none smtp.client-ip=170.10.129.124 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="NA1vW6IZ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1710966271; 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=eCFXpjAzH80ioMiekBjHvVKOxv2INAL7O3pqSOfLGCE=; b=NA1vW6IZnxMO7zrN++uPZaKrDKqx+h7D6zceLv2xm/FWERx7NiETp5kEZwnQkjjBOc2glX 6rlwegPU3RofM387Nymt0xXBObd4a1saZ/JXYzwTCKXYEJHu+dATQxzX5nF6KzFq7wF/mM JOY2w+2MWY9etnvDDUUDpyolKNB3I68= Received: from mail-qt1-f200.google.com (mail-qt1-f200.google.com [209.85.160.200]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-21-jfSuZGx6M8irplP6IvIXbQ-1; Wed, 20 Mar 2024 16:24:29 -0400 X-MC-Unique: jfSuZGx6M8irplP6IvIXbQ-1 Received: by mail-qt1-f200.google.com with SMTP id d75a77b69052e-430d45c66acso452351cf.1 for ; Wed, 20 Mar 2024 13:24:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710966269; x=1711571069; 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=eCFXpjAzH80ioMiekBjHvVKOxv2INAL7O3pqSOfLGCE=; b=hQcdW6VLMMd7b8lUhsgOtsRYwRla9Y8DxlMuE1NaroVig/H5wQgjLbsylQOwQdekpY LwBylGTLQDarDSCrx2CPkwZVkufP1E7dry6zoruyaA9rhjS/cHSEOONnzonfIGj8Sy67 kuGt5QrC2f2TUn++c6TsWGfLbjtJQWBbHQB3FO4BpKhvuo2pEPXowyqjOB6LcZMCSiJ7 q39fdGA8t5jC7S6BZN2ZBtqAbH4iKEVf5jOMq+sM39DjkDmcpYX9TNiQ4dm6snflZ+o8 a0UV2XyIRi2KS3fUY8v0Nq23i5v3n8eMFtOuleMw60sUqjH31yODjiuBrZIedF4An7Dv REnQ== X-Forwarded-Encrypted: i=1; AJvYcCW9dOa9t7TmU/gWhzrUDroLJIAjlOt6WDUhrVGelt1gn7cvEFnqjmc+WCQs0QJztAnOBt36ley2kqVYTa3T92g6CQe3l7VN1viGcA== X-Gm-Message-State: AOJu0YwvmUCEdPzbo9Xo3BMmoBWP+6OhoyH+wjyESk66p4Wv0IkP8wUy d5oNbaiR6kQ/Q5f8JzYkGt/bBiltgNSkvnuHMux9WIJqtbQ/+esyQkgk5SanJYpdZaY2/J5iJOd N4S3ynVLntsXRR0tsVHqBpRZNpLpL0WFI7MSfbXQYA2lCXPuhI+AH1vRf52o= X-Received: by 2002:a05:6214:4285:b0:68f:e779:70f2 with SMTP id og5-20020a056214428500b0068fe77970f2mr3011042qvb.3.1710966268736; Wed, 20 Mar 2024 13:24:28 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEC7ZXjclbG6h5wFeCIdBAt5YTulJwCv/uK86AiBxheygftq1ifha1EzMNeKJfkJ4R9dQ9Xpg== X-Received: by 2002:a05:6214:4285:b0:68f:e779:70f2 with SMTP id og5-20020a056214428500b0068fe77970f2mr3011015qvb.3.1710966268333; Wed, 20 Mar 2024 13:24:28 -0700 (PDT) Received: from x1n ([99.254.121.117]) by smtp.gmail.com with ESMTPSA id im14-20020a056214246e00b0069049298fccsm8155728qvb.65.2024.03.20.13.24.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Mar 2024 13:24:27 -0700 (PDT) Date: Wed, 20 Mar 2024 16:24:25 -0400 From: Peter Xu To: Christophe Leroy Cc: "Aneesh Kumar K.V" , Jason Gunthorpe , "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" , Michael Ellerman , Nicholas Piggin , "Naveen N. Rao" Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf() Message-ID: References: <20240313214719.253873-10-peterx@redhat.com> <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> <1f6ad500-3ff7-44d4-8223-067bd2ed9ffe@csgroup.eu> <20240318161519.GA5825@nvidia.com> <20240319232656.GC159172@nvidia.com> <7ca8f19e-7517-404a-b7bb-92ac516d87c8@csgroup.eu> <2e632389-eb4e-42af-adee-36d5ba6c3d0f@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: <2e632389-eb4e-42af-adee-36d5ba6c3d0f@csgroup.eu> On Wed, Mar 20, 2024 at 05:40:39PM +0000, Christophe Leroy wrote: > > > Le 20/03/2024 à 17:09, Peter Xu a écrit : > > On Wed, Mar 20, 2024 at 06:16:43AM +0000, Christophe Leroy wrote: > >> At the first place that was to get a close fit between hardware > >> pagetable topology and linux pagetable topology. But obviously we > >> already stepped back for 512k pages, so let's go one more step aside and > >> do similar with 8M pages. > >> > >> I'll give it a try and see how it goes. > > > > So you're talking about 8M only for 8xx, am I right? > > Yes I am. > > > > > There seem to be other PowerPC systems use hugepd. Is it possible that we > > convert all hugepd into cont_pte form? > > Indeed. > > Seems like we have hugepd for book3s/64 and for nohash. > > For book3s I don't know, may Aneesh can answer. > > For nohash I think it should be possible because TLB misses are handled > by software. Even the e6500 which has a hardware tablewalk falls back on > software walk when it is a hugepage IIUC. It'll be great if I can get some answer here, and then I know the path for hugepd in general. I don't want to add any new code into core mm to something destined to fade away soon. One option for me is I can check a macro of hugepd existance, so all new code will only work when hugepd is not supported on such arch. However that'll start to make some PowerPC systems special (which I still tried hard to avoid, if that wasn't proved in the past..), meanwhile we'll also need to keep some generic-mm paths (that I can already remove along with the new code) only for these hugepd systems. But it's still okay to me, it'll be just a matter of when to drop those codes, sooner or later. 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Rao" Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf() Message-ID: References: <20240313214719.253873-10-peterx@redhat.com> <7b7d6ce1-4a3f-4392-951d-a9bd146c954c@csgroup.eu> <1f6ad500-3ff7-44d4-8223-067bd2ed9ffe@csgroup.eu> <20240318161519.GA5825@nvidia.com> <20240319232656.GC159172@nvidia.com> <7ca8f19e-7517-404a-b7bb-92ac516d87c8@csgroup.eu> <2e632389-eb4e-42af-adee-36d5ba6c3d0f@csgroup.eu> MIME-Version: 1.0 In-Reply-To: <2e632389-eb4e-42af-adee-36d5ba6c3d0f@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-20240320_132435_032761_8619401A X-CRM114-Status: GOOD ( 25.97 ) 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 T24gV2VkLCBNYXIgMjAsIDIwMjQgYXQgMDU6NDA6MzlQTSArMDAwMCwgQ2hyaXN0b3BoZSBMZXJv eSB3cm90ZToKPiAKPiAKPiBMZSAyMC8wMy8yMDI0IMOgIDE3OjA5LCBQZXRlciBYdSBhIMOpY3Jp dMKgOgo+ID4gT24gV2VkLCBNYXIgMjAsIDIwMjQgYXQgMDY6MTY6NDNBTSArMDAwMCwgQ2hyaXN0 b3BoZSBMZXJveSB3cm90ZToKPiA+PiBBdCB0aGUgZmlyc3QgcGxhY2UgdGhhdCB3YXMgdG8gZ2V0 IGEgY2xvc2UgZml0IGJldHdlZW4gaGFyZHdhcmUKPiA+PiBwYWdldGFibGUgdG9wb2xvZ3kgYW5k IGxpbnV4IHBhZ2V0YWJsZSB0b3BvbG9neS4gQnV0IG9idmlvdXNseSB3ZQo+ID4+IGFscmVhZHkg c3RlcHBlZCBiYWNrIGZvciA1MTJrIHBhZ2VzLCBzbyBsZXQncyBnbyBvbmUgbW9yZSBzdGVwIGFz aWRlIGFuZAo+ID4+IGRvIHNpbWlsYXIgd2l0aCA4TSBwYWdlcy4KPiA+Pgo+ID4+IEknbGwgZ2l2 ZSBpdCBhIHRyeSBhbmQgc2VlIGhvdyBpdCBnb2VzLgo+ID4gCj4gPiBTbyB5b3UncmUgdGFsa2lu ZyBhYm91dCA4TSBvbmx5IGZvciA4eHgsIGFtIEkgcmlnaHQ/Cj4gCj4gWWVzIEkgYW0uCj4gCj4g PiAKPiA+IFRoZXJlIHNlZW0gdG8gYmUgb3RoZXIgUG93ZXJQQyBzeXN0ZW1zIHVzZSBodWdlcGQu ICBJcyBpdCBwb3NzaWJsZSB0aGF0IHdlCj4gPiBjb252ZXJ0IGFsbCBodWdlcGQgaW50byBjb250 X3B0ZSBmb3JtPwo+IAo+IEluZGVlZC4KPiAKPiBTZWVtcyBsaWtlIHdlIGhhdmUgaHVnZXBkIGZv ciBib29rM3MvNjQgYW5kIGZvciBub2hhc2guCj4gCj4gRm9yIGJvb2szcyBJIGRvbid0IGtub3cs IG1heSBBbmVlc2ggY2FuIGFuc3dlci4KPiAKPiBGb3Igbm9oYXNoIEkgdGhpbmsgaXQgc2hvdWxk IGJlIHBvc3NpYmxlIGJlY2F1c2UgVExCIG1pc3NlcyBhcmUgaGFuZGxlZCAKPiBieSBzb2Z0d2Fy ZS4gRXZlbiB0aGUgZTY1MDAgd2hpY2ggaGFzIGEgaGFyZHdhcmUgdGFibGV3YWxrIGZhbGxzIGJh Y2sgb24gCj4gc29mdHdhcmUgd2FsayB3aGVuIGl0IGlzIGEgaHVnZXBhZ2UgSUlVQy4KCkl0J2xs IGJlIGdyZWF0IGlmIEkgY2FuIGdldCBzb21lIGFuc3dlciBoZXJlLCBhbmQgdGhlbiBJIGtub3cg dGhlIHBhdGggZm9yCmh1Z2VwZCBpbiBnZW5lcmFsLiAgSSBkb24ndCB3YW50IHRvIGFkZCBhbnkg bmV3IGNvZGUgaW50byBjb3JlIG1tIHRvCnNvbWV0aGluZyBkZXN0aW5lZCB0byBmYWRlIGF3YXkg c29vbi4KCk9uZSBvcHRpb24gZm9yIG1lIGlzIEkgY2FuIGNoZWNrIGEgbWFjcm8gb2YgaHVnZXBk IGV4aXN0YW5jZSwgc28gYWxsIG5ldwpjb2RlIHdpbGwgb25seSB3b3JrIHdoZW4gaHVnZXBkIGlz IG5vdCBzdXBwb3J0ZWQgb24gc3VjaCBhcmNoLiAgSG93ZXZlcgp0aGF0J2xsIHN0YXJ0IHRvIG1h a2Ugc29tZSBQb3dlclBDIHN5c3RlbXMgc3BlY2lhbCAod2hpY2ggSSBzdGlsbCB0cmllZApoYXJk IHRvIGF2b2lkLCBpZiB0aGF0IHdhc24ndCBwcm92ZWQgaW4gdGhlIHBhc3QuLiksIG1lYW53aGls ZSB3ZSdsbCBhbHNvCm5lZWQgdG8ga2VlcCBzb21lIGdlbmVyaWMtbW0gcGF0aHMgKHRoYXQgSSBj YW4gYWxyZWFkeSByZW1vdmUgYWxvbmcgd2l0aAp0aGUgbmV3IGNvZGUpIG9ubHkgZm9yIHRoZXNl IGh1Z2VwZCBzeXN0ZW1zLiAgQnV0IGl0J3Mgc3RpbGwgb2theSB0byBtZSwKaXQnbGwgYmUganVz dCBhIG1hdHRlciBvZiB3aGVuIHRvIGRyb3AgdGhvc2UgY29kZXMsIHNvb25lciBvciBsYXRlci4K ClRoYW5rcywKCi0tIApQZXRlciBYdQoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1r ZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWls bWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK