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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8iRH-000RNp-5V; Tue, 05 Jul 2022 13:18:03 +0000 Received: from out30-56.freemail.mail.aliyun.com ([115.124.30.56]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8iRB-000RKi-52 for linux-arm-kernel@lists.infradead.org; Tue, 05 Jul 2022 13:18:01 +0000 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046050;MF=guanghuifeng@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0VISKJA4_1657027069; Received: from 30.225.28.170(mailfrom:guanghuifeng@linux.alibaba.com fp:SMTPD_---0VISKJA4_1657027069) by smtp.aliyun-inc.com; Tue, 05 Jul 2022 21:17:50 +0800 Message-ID: <51f7c840-f892-fa98-632b-4c06b76fb32a@linux.alibaba.com> Date: Tue, 5 Jul 2022 21:17:48 +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: Mike Rapoport , Will Deacon Cc: Ard Biesheuvel , 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, geert+renesas@glider.be, linux-mm@kvack.org, yaohongbo@linux.alibaba.com, alikernel-developer@linux.alibaba.com References: <4accaeda-572f-f72d-5067-2d0999e4d00a@linux.alibaba.com> <20220704131516.GC31684@willie-the-truck> <2ae1cae0-ee26-aa59-7ed9-231d67194dce@linux.alibaba.com> <20220704142313.GE31684@willie-the-truck> <6977c692-78ca-5a67-773e-0389c85f2650@linux.alibaba.com> <20220704163815.GA32177@willie-the-truck> <20220705095231.GB552@willie-the-truck> <5d044fdd-a61a-d60f-d294-89e17de37712@linux.alibaba.com> <20220705121115.GB1012@willie-the-truck> From: "guanghui.fgh" In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220705_061757_419851_E3D69C5E X-CRM114-Status: GOOD ( 11.57 ) 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 CgrlnKggMjAyMi83LzUgMjA6NTYsIE1pa2UgUmFwb3BvcnQg5YaZ6YGTOgo+IE9uIFR1ZSwgSnVs IDA1LCAyMDIyIGF0IDAxOjExOjE2UE0gKzAxMDAsIFdpbGwgRGVhY29uIHdyb3RlOgo+PiBPbiBU dWUsIEp1bCAwNSwgMjAyMiBhdCAwODowNzowN1BNICswODAwLCBndWFuZ2h1aS5mZ2ggd3JvdGU6 Cj4+Pgo+Pj4gMS5UaGUgcm9kYXRhIGZ1bGwgaXMgaGFybSB0byB0aGUgcGVyZm9ybWFuY2UgYW5k IGhhcyBiZWVuIGRpc2FibGVkIGluLWhvdXNlLgo+Pj4KPj4+IDIuV2hlbiB1c2luZyBjcmFzaGtl cm5lbCB3aXRoIHJvZGF0YSBub24gZnVsbCwgdGhlIGtlcm5lbCBhbHNvIHdpbGwgdXNlIG5vbgo+ Pj4gYmxvY2svc2VjdGlvbiBtYXBwaW5nIHdoaWNoIGNhdXNlIGhpZ2ggZC1UTEIgbWlzcyBhbmQg ZGVncmFkZSBwZXJmb3JtYW5jZQo+Pj4gZ3JlYXRseS4KPj4+IFRoaXMgcGF0Y2ggZml4IGl0IHRv IHVzZSBibG9jay9zZWN0aW9uIG1hcHBpbmcgYXMgZmFyIGFzIHBvc3NpYmxlLgo+Pj4KPj4+IGJv b2wgY2FuX3NldF9kaXJlY3RfbWFwKHZvaWQpCj4+PiB7Cj4+PiAJcmV0dXJuIHJvZGF0YV9mdWxs IHx8IGRlYnVnX3BhZ2VhbGxvY19lbmFibGVkKCk7Cj4+PiB9Cj4+Pgo+Pj4gbWFwX21lbToKPj4+ IGlmIChjYW5fc2V0X2RpcmVjdF9tYXAoKSB8fCBJU19FTkFCTEVEKENPTkZJR19LRkVOQ0UpKQo+ Pj4gCWZsYWdzIHw9IE5PX0JMT0NLX01BUFBJTkdTIHwgTk9fQ09OVF9NQVBQSU5HUzsKPj4+Cj4+ PiAzLldoZW4gcm9kYXRhIGZ1bGwgaXMgZGlzYWJsZWQsIGNyYXNoa2VybmVsIGFsc28gbmVlZCBw cm90ZWN0KGtlZXAKPj4+IGFyY2hfa2V4ZWNfW3VuXXByb3RlY3RfY3Jhc2hrcmVzIHVzaW5nKS4K Pj4+IEkgdGhpbmsgY3Jhc2hrZXJuZWwgc2hvdWxkJ3QgZGVwZW5kIG9uIHJhZGF0YSBmdWxsKE1h eWJlIG90aGVyIGFyY2hpdGVjdHVyZQo+Pj4gZG9uJ3Qgc3VwcG9ydCByYWRhdGEgZnVsbCBub3cp Lgo+Pgo+PiBJIHRoaW5rIHRoaXMgaXMgZ29pbmcgcm91bmQgaW4gY2lyY2xlcyA6Lwo+Pgo+PiBB cyBhIGZpcnN0IHN0ZXAsIGNhbiB3ZSBwbGVhc2UgbGVhdmUgdGhlIGNyYXNoa2VybmVsIG1hcHBl ZCB1bmxlc3MKPj4gcm9kYXRhPWZ1bGw/IEl0IHNob3VsZCBiZSBhIG11Y2ggc2ltcGxlciBwYXRj aCB0byB3cml0ZSwgcmV2aWV3IGFuZCBtYWludGFpbgo+PiBhbmQgaXQgZ2l2ZXMgeW91IHRoZSBw ZXJmb3JtYW5jZSB5b3Ugd2FudCB3aGVuIGNyYXNoa2VybmVsIGlzIGJlaW5nIHVzZWQuCj4gCj4g U2luY2Ugd2UgYXJlIHRhbGtpbmcgYWJvdXQgbGFyZ2Ugc3lzdGVtcywgd2hhdCBkbyB5b3UgdGhp bmsgYWJvdXQgbGV0dGluZwo+IHRoZW0gc2V0IENSQVNIX0FMSUdOIHRvIFBVRF9TSVpFLCB0aGVu Cj4gCj4gCXVubWFwKGNyYXNoa2VybmVsKTsKPiAJX19jcmVhdGVfcGdkX21hcHBpbmcoY3Jhc2hr ZXJuZWwsIE5PX0JMT0NLX01BUFBJTkdTKTsKPiAKPiBzaG91bGQgYmUgZW5vdWdoIHRvIG1ha2Ug Y3Jhc2gga2VybmVsIG1hcHBlZCB3aXRoIGJhc2UgcGFnZXMuCj4gICAKPj4gV2lsbAo+IApUaGFu a3MuCgoxLldoZW4ga2VybmVsIGJvb3RzIHdpdGggY3Jhc2hrZXJuZWwsIHRoZSBjcmFzaGtlcm5l bCBwYXJhbWV0ZXJzIGZvcm1hdCBpczoKME0tMkc6ME0sMkctMjU2RzoyNTZNLDI1NkctMTAyNEc6 MzIwTSwxMDI0Ry06Mzg0TSB3aGljaCBpcyBzZWxmLWFkYXB0aW9uIAp0byBtdWx0aXBsZSBzeXN0 ZW0uCgoyLkFzIG1lbnRpb25lZCBhYm92ZSwgdGhlIGNyYXNoa2VybmVsIG1lbSBzaXplIG1heWJl IGxlc3MgdGhhbiAKUFVEX1NJWkUoTm90IG11bHRpcGxlIHRpbWUgdG8gUFVEX1NJWkUpLgpTbywg bWF5YmUgd2UgYWxzbyBuZWVkIHVzZSBzb21lIG5vbiBibG9jay9zZWN0aW9uIG1hcHBpbmdzLgoK X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJt LWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3Jn Cmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtl cm5lbAo=