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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0B567C43334 for ; Mon, 4 Jul 2022 14:12:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=kxeOECtoSQsvTx9RFud70RBIx5Cl0L/DtOPa/YJI9NE=; b=3c0wtgSh1VOOxL G/swOIdgeamXypMJEoQACN5p65WlXAth3Oms0q1+KtSs4v3aj+0GvATcEv9CzUHI5VxBs6k6RLvYv i1Koipg3LLkQFcMAjbPj794d+02XSkH47XKeZa4U+grehs3B0S3PQggoFEupB4OJp0A+ppl3AW0T/ R8YJdejxmooKXT922jMbH5CBWhZa7bTbeqmhjbEyIY+Nq4FhElTh2v90H1cjl13PWFzHvLB2hX6fw VoIixLCjUoe8cJfxQhbDy08qRCMNEJW3Y5dIU7rAquwtmp2H2Lp4QcqksHsYEaICUwbNa5nZOs1SM rlNjZGhyw2mNN9aSKOsg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8Mni-009Nqq-IO; Mon, 04 Jul 2022 14:11:46 +0000 Received: from out30-132.freemail.mail.aliyun.com ([115.124.30.132]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8Mnc-009NnL-AN for linux-arm-kernel@lists.infradead.org; Mon, 04 Jul 2022 14:11:44 +0000 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R391e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046049;MF=guanghuifeng@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0VINQ1y1_1656943888; Received: from 30.225.28.131(mailfrom:guanghuifeng@linux.alibaba.com fp:SMTPD_---0VINQ1y1_1656943888) by smtp.aliyun-inc.com; Mon, 04 Jul 2022 22:11:29 +0800 Message-ID: <2ae1cae0-ee26-aa59-7ed9-231d67194dce@linux.alibaba.com> Date: Mon, 4 Jul 2022 22:11:27 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: Re: [PATCH v4] arm64: mm: fix linear mem mapping access performance degradation To: Will Deacon Cc: baolin.wang@linux.alibaba.com, catalin.marinas@arm.com, akpm@linux-foundation.org, david@redhat.com, jianyong.wu@arm.com, james.morse@arm.com, quic_qiancai@quicinc.com, christophe.leroy@csgroup.eu, jonathan@marek.ca, mark.rutland@arm.com, thunder.leizhen@huawei.com, anshuman.khandual@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, rppt@kernel.org, geert+renesas@glider.be, ardb@kernel.org, linux-mm@kvack.org, yaohongbo@linux.alibaba.com, alikernel-developer@linux.alibaba.com References: <1656777473-73887-1-git-send-email-guanghuifeng@linux.alibaba.com> <20220704103523.GC31437@willie-the-truck> <73f0c53b-fd17-c5e9-3773-1d71e564eb50@linux.alibaba.com> <20220704111402.GA31553@willie-the-truck> <4accaeda-572f-f72d-5067-2d0999e4d00a@linux.alibaba.com> <20220704131516.GC31684@willie-the-truck> From: "guanghui.fgh" In-Reply-To: <20220704131516.GC31684@willie-the-truck> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220704_071140_613711_9B6109C3 X-CRM114-Status: GOOD ( 19.93 ) 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-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org CgrlnKggMjAyMi83LzQgMjE6MTUsIFdpbGwgRGVhY29uIOWGmemBkzoKPiBPbiBNb24sIEp1bCAw NCwgMjAyMiBhdCAwODowNTo1OVBNICswODAwLCBndWFuZ2h1aS5mZ2ggd3JvdGU6Cj4+Cj4+Cj4+ IOWcqCAyMDIyLzcvNCAxOToxNCwgV2lsbCBEZWFjb24g5YaZ6YGTOgo+Pj4gT24gTW9uLCBKdWwg MDQsIDIwMjIgYXQgMDY6NTg6MjBQTSArMDgwMCwgZ3VhbmdodWkuZmdoIHdyb3RlOgo+Pj4+Cj4+ Pj4KPj4+PiDlnKggMjAyMi83LzQgMTg6MzUsIFdpbGwgRGVhY29uIOWGmemBkzoKPj4+Pj4gT24g U2F0LCBKdWwgMDIsIDIwMjIgYXQgMTE6NTc6NTNQTSArMDgwMCwgR3VhbmdodWkgRmVuZyB3cm90 ZToKPj4+Pj4+IFRoZSBhcm02NCBjYW4gYnVpbGQgMk0vMUcgYmxvY2svc2VjdGlpb24gbWFwcGlu Zy4gV2hlbiB1c2luZyBETUEvRE1BMzIgem9uZQo+Pj4+Pj4gKGVuYWJsZSBjcmFzaGtlcm5lbCwg ZGlzYWJsZSByb2RhdGEgZnVsbCwgZGlzYWJsZSBrZmVuY2UpLCB0aGUgbWVtX21hcCB3aWxsCj4+ Pj4+PiB1c2Ugbm9uIGJsb2NrL3NlY3Rpb24gbWFwcGluZyhmb3IgY3Jhc2hrZXJuZWwgcmVxdWly ZXMgdG8gc2hyaW5rIHRoZSByZWdpb24KPj4+Pj4+IGluIHBhZ2UgZ3JhbnVsYXJpdHkpLiBCdXQg aXQgd2lsbCBkZWdyYWRlIHBlcmZvcm1hbmNlIHdoZW4gZG9pbmcgbGFyZ2luZwo+Pj4+Pj4gY29u dGludW91cyBtZW0gYWNjZXNzIGluIGtlcm5lbChtZW1jcHkvbWVtbW92ZSwgZXRjKS4KPj4+Pj4K Pj4+Pj4gSG1tLiBJdCBzZWVtcyBhIGJpdCBzaWxseSB0byBtZSB0aGF0IHdlIHRha2Ugc3BlY2lh bCBjYXJlIHRvIHVubWFwIHRoZQo+Pj4+PiBjcmFzaGtlcm5lbCBmcm9tIHRoZSBsaW5lYXIgbWFw IGV2ZW4gd2hlbiBjYW5fc2V0X2RpcmVjdF9tYXAoKSBpcyBmYWxzZSwgYXMKPj4+Pj4gd2Ugd29u J3QgYmUgcHJvdGVjdGluZyB0aGUgbWFpbiBrZXJuZWwgYXQgYWxsIQo+Pj4+Pgo+Pj4+PiBXaHkg ZG9uJ3Qgd2UganVzdCBsZWF2ZSB0aGUgY3Jhc2hrZXJuZWwgbWFwcGVkIGlmICFjYW5fc2V0X2Rp cmVjdF9tYXAoKQo+Pj4+PiBhbmQgdGhlbiB0aGlzIHByb2JsZW0ganVzdCBnb2VzIGF3YXk/Cj4+ Pj4KPj4+PiBUaGlzIHF1ZXN0aW9uIGhhZCBiZWVuIGFza2VkIGxhc2sgd2Vlay4KPj4+Cj4+PiBT b3JyeSwgSSBkaWRuJ3Qgc3BvdCB0aGF0LiBQbGVhc2UgY291bGQgeW91IGxpbmsgbWUgdG8gdGhl IGNvbnZlcnNhdGlvbiwgYXMKPj4+IEknbSBzdGlsbCB1bmFibGUgdG8gZmluZCBpdCBpbiBteSBp bmJveD8KPj4KPj4gUGxlYXNlIGFjY2VzcyB0aGlzIGxpbms6Cj4+IGh0dHBzOi8vbG9yZS5rZXJu ZWwub3JnL2xpbnV4LWFybS1rZXJuZWwvMDc1YjBhOGUtY2I3ZS03MGY2LWI0NWEtNTRjZDMxODg2 Nzk0QGxpbnV4LmFsaWJhYmEuY29tL1QvCj4gCj4gU29ycnksIGJ1dCBJIHJlYWQgdGhyb3VnaCB0 aGUgdGhyZWFkIGFuZCBJIHN0aWxsIGNhbid0IGZpbmQgd2hlcmUgdGhlCj4gcG9zc2liaWxpdHkg b2YgbGVhdmluZyB0aGUgY3Jhc2hrZXJuZWwgbWFwcGVkIHdhcyBkaXNjdXNzZWQuCj4gCj4+Pj4g MS5RdW90ZWQgbWVzc2FnZXMgZnJvbSBhcmNoL2FybTY0L21tL2luaXQuYwo+Pj4+Cj4+Pj4gIk1l bW9yeSByZXNlcnZhdGlvbiBmb3IgY3Jhc2gga2VybmVsIGVpdGhlciBkb25lIGVhcmx5IG9yIGRl ZmVycmVkCj4+Pj4gZGVwZW5kaW5nIG9uIERNQSBtZW1vcnkgem9uZXMgY29uZmlncyAoWk9ORV9E TUEpIC0tCj4+Pj4KPj4+PiBJbiBhYnNlbmNlIG9mIFpPTkVfRE1BIGNvbmZpZ3MgYXJtNjRfZG1h X3BoeXNfbGltaXQgaW5pdGlhbGl6ZWQKPj4+PiBoZXJlIGluc3RlYWQgb2YgbWF4X3pvbmVfcGh5 cygpLiAgVGhpcyBsZXRzIGVhcmx5IHJlc2VydmF0aW9uIG9mCj4+Pj4gY3Jhc2gga2VybmVsIG1l bW9yeSB3aGljaCBoYXMgYSBkZXBlbmRlbmN5IG9uIGFybTY0X2RtYV9waHlzX2xpbWl0Lgo+Pj4+ IFJlc2VydmluZyBtZW1vcnkgZWFybHkgZm9yIGNyYXNoIGtlcm5lbCBhbGxvd3MgbGluZWFyIGNy ZWF0aW9uIG9mIGJsb2NrCj4+Pj4gbWFwcGluZ3MgKGdyZWF0ZXIgdGhhbiBwYWdlLWdyYW51bGFy aXR5KSBmb3IgYWxsIHRoZSBtZW1vcnkgYmFuayByYW5ncy4KPj4+PiBJbiB0aGlzIHNjaGVtZSBh IGNvbXBhcmF0aXZlbHkgcXVpY2tlciBib290IGlzIG9ic2VydmVkLgo+Pj4+Cj4+Pj4gSWYgWk9O RV9ETUEgY29uZmlncyBhcmUgZGVmaW5lZCwgY3Jhc2gga2VybmVsIG1lbW9yeSByZXNlcnZhdGlv bgo+Pj4+IGlzIGRlbGF5ZWQgdW50aWwgRE1BIHpvbmUgbWVtb3J5IHJhbmdlIHNpemUgaW5pdGlh bGl6YXRpb24gcGVyZm9ybWVkIGluCj4+Pj4gem9uZV9zaXplc19pbml0KCkuICBUaGUgZGVmZXIg aXMgbmVjZXNzYXJ5IHRvIHN0ZWVyIGNsZWFyIG9mIERNQSB6b25lCj4+Pj4gbWVtb3J5IHJhbmdl IHRvIGF2b2lkIG92ZXJsYXAgYWxsb2NhdGlvbi4KPj4+Pgo+Pj4+IFtbWwo+Pj4+IFNvIGNyYXNo IGtlcm5lbCBtZW1vcnkgYm91bmRhcmllcyBhcmUgbm90IGtub3duIHdoZW4gbWFwcGluZyBhbGwg YmFuayBtZW1vcnkKPj4+PiByYW5nZXMsIHdoaWNoIG90aGVyd2lzZSBtZWFucyBub3QgcG9zc2li bGUgdG8gZXhjbHVkZSBjcmFzaCBrZXJuZWwgcmFuZ2UKPj4+PiBmcm9tIGNyZWF0aW5nIGJsb2Nr IG1hcHBpbmdzIHNvIHBhZ2UtZ3JhbnVsYXJpdHkgbWFwcGluZ3MgYXJlIGNyZWF0ZWQgZm9yCj4+ Pj4gdGhlIGVudGlyZSBtZW1vcnkgcmFuZ2UuCj4+Pj4gXV1dIgo+Pj4+Cj4+Pj4gTmFtZWx5LCB0 aGUgaW5pdCBvcmRlcjogbWVtYmxvY2sgaW5pdC0tLT5saW5lYXIgbWVtIG1hcHBpbmcoNGsgbWFw cGluZyBmb3IKPj4+PiBjcmFzaGtlcm5lbCwgcmVxdWlyaW5pZyBwYWdlLWdyYW51bGFyaXR5IGNo YW5naW5nKSktLS0+em9uZSBkbWEKPj4+PiBsaW1pdC0tLT5yZXNlcnZlIGNyYXNoa2VybmVsLgo+ Pj4+IFNvIHdoZW4gZW5hYmxlIFpPTkUgRE1BIGFuZCB1c2luZyBjcmFzaGtlcm5lbCwgdGhlIG1l bSBtYXBwaW5nIHVzaW5nIDRrCj4+Pj4gbWFwcGluZy4KPj4+Cj4+PiBZZXMsIEkgdW5kZXJzdGFu ZCB0aGF0IGlzIGhvdyB0aGluZ3Mgd29yayB0b2RheSBidXQgSSdtIHNheWluZyB0aGF0IHdlIG1h eQo+Pj4gYXMgd2VsbCBsZWF2ZSB0aGUgY3Jhc2hrZXJuZWwgbWFwcGVkIChhdCBibG9jayBncmFu dWxhcml0eSkgaWYKPj4+ICFjYW5fc2V0X2RpcmVjdF9tYXAoKSBhbmQgdGhlbiBJIHRoaW5rIHlv dXIgcGF0Y2ggYmVjb21lcyBhIGxvdCBzaW1wbGVyLgo+Pgo+PiBCdXQgUGFnZS1ncmFudWxhcml0 eSBtYXBwcGluZ3MgYXJlIG5lY2Vzc2FyeSBmb3IgY3Jhc2gga2VybmVsIG1lbW9yeSByYW5nZQo+ PiBmb3Igc2hyaW5raW5nIGl0cyBzaXplIHZpYSAvc3lzL2tlcm5lbC9rZXhlY19jcmFzaF9zaXpl IGludGVyZmFjKFF1b3RlZCBmcm9tCj4+IGFyY2gvYXJtNjQvbW0vaW5pdC5jKS4KPj4gU28gdGhp cyBwYXRjaCBzcGxpdCBibG9jay9zZWN0aW9uIG1hcHBpbmcgdG8gNGsgcGFnZS1ncmFudWxhcml0 eSBtYXBwaW5nIGZvcgo+PiBjcmFzaGtlcm5lbCBtZW0uCj4gCj4gV2h5PyBJIGRvbid0IHNlZSB3 aHkgdGhlIG1hcHBpbmcgZ3JhbnVsYXJpdHkgaXMgcmVsZXZhbnQgYXQgYWxsIGlmIHdlCj4gYWx3 YXlzIGxlYXZlIHRoZSB3aG9sZSB0aGluZyBtYXBwZWQuCj4gCj4gV2lsbAoKVGhlcmUgaXMgYW5v dGhlciByZWFzb24uCgpXaGVuIGxvYWRpbmcgY3Jhc2hrZXJuZWwgZmluaXNoLCB0aGUgZG9fa2V4 ZWNfbG9hZCB3aWxsIHVzZSAKYXJjaF9rZXhlY19wcm90ZWN0X2NyYXNoa3JlcyB0byBpbnZhbGlk IGFsbCB0aGUgcGFnZXRhYmxlIGZvciAKY3Jhc2hrZXJuZWwgbWVtKHByb3RlY3QgY3Jhc2hrZXJu ZWwgbWVtIGZyb20gYWNjZXNzKS4KCmFyY2hfa2V4ZWNfcHJvdGVjdF9jcmFzaGtyZXMtLS0+c2V0 X21lbW9yeV92YWxpZC0tLT4uLi4tLS0+YXBwbHlfdG9fcG1kX3JhbmdlCgpJbiB0aGUgYXBwbHlf dG9fcG1kX3JhbmdlLCB0aGVyZSBpcyBhIGp1ZGVtZW5077yaIEJVR19PTihwdWRfaHVnZSgqcHVk KSkuIApBbmQgaWYgdGhlIGNyYXNoa2VybmVsIHVzZSBibG9jay9zZWN0aW9uIG1hcHBpbmcsIHRo ZXJlIHdpbGwgYmUgc29tZSBlcnJvci4KCk5hbWVseSwgaXQncyBuZWVkIHRvIHVzZSBub24gYmxv Y2svc2VjdGlvbiBtYXBwaW5nIGZvciBjcmFzaGtlcm5lbCBtZW0gCmJlZm9yZSBzaHJpbmdraW5n LgoKVGhhbmtzLgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5p bmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8v bGludXgtYXJtLWtlcm5lbAo=