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 5B67EC43334 for ; Tue, 5 Jul 2022 09:54:35 +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-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=G+oSpDqRZ1RCFNvQAoV3DvYl5HNSEmsQlavL1uemsCs=; b=gpWzOTc8E+tUQ5 ohyIeBMY4zGYrJl2lWJMw9jbZEflr1846J4iGqYpO19xrnAccEArjylQZTaGYNvKJoIoqHDYIOeFo ooUZI2nsKOFb1VhF2qrE3Jwtngymo0U7nh06kB0pAndUxUIxaytmQ6lIPp7acu4x8d06LB1CaE0Hu W+dSnxZKLZEPKrEDjlrvzYxw0zz6m6VkreYyEWcbWE/nRR7bH/dUIwz6nVBDYUNpJjCMTw11U0HET qpieH7J5A6kQvNr6eaSFxFgUaHDXjuuDcIl0OIOEJSQotxsP7qy1tfI821eYrvmi7zYBh9iUjYtSL usJk0ytkTzfjhJr0aRfw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8fFM-00Gxqw-48; Tue, 05 Jul 2022 09:53:32 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8fEZ-00GxEg-Hr for linux-arm-kernel@lists.infradead.org; Tue, 05 Jul 2022 09:52:44 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E3FBC61994; Tue, 5 Jul 2022 09:52:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C206C341C7; Tue, 5 Jul 2022 09:52:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657014762; bh=9MTPdYNRD6u5hC7g7ZiQEjDmfdWtcP6Y0Ap52ScAOrU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=E+0G79QBInSietGAYHA+UwbA3SZdfOhuaklndufor9FZUA6khw3anhHUNDoGOHD3B OiNjMC0GZjnUkxas6g5DGYAsuZ/RnPNtExcsDV8q2J8RuM44nwYY1vDlloERd60WZh YKZlVgWUyfbZ4xKkyhFBQygOwhkVVcWBSixfQsmF+VGDJ0GohzgQWAE81Alg2zj2zx C70oiDFt5aiNCbRzP9yWU3+vZYKu4lPp3Xfr1kKLd5Mh+2vWJJhvZdawLdZUY4fHNP LF7WtnHGD4S0ApNQOLCA5bgA7XycFTlf0uTwsCjGWQIh5wKFOP+TKdHTZCj30wY0M+ kIDCKPPpyGxgg== Date: Tue, 5 Jul 2022 10:52:34 +0100 From: Will Deacon To: Ard Biesheuvel Cc: "guanghui.fgh" , 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, linux-mm@kvack.org, yaohongbo@linux.alibaba.com, alikernel-developer@linux.alibaba.com Subject: Re: [PATCH v4] arm64: mm: fix linear mem mapping access performance degradation Message-ID: <20220705095231.GB552@willie-the-truck> References: <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> <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> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220705_025243_701260_B89AF816 X-CRM114-Status: GOOD ( 30.04 ) 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 T24gTW9uLCBKdWwgMDQsIDIwMjIgYXQgMDc6MDk6MjNQTSArMDIwMCwgQXJkIEJpZXNoZXV2ZWwg d3JvdGU6Cj4gT24gTW9uLCA0IEp1bCAyMDIyIGF0IDE4OjM4LCBXaWxsIERlYWNvbiA8d2lsbEBr ZXJuZWwub3JnPiB3cm90ZToKPiA+Cj4gPiBPbiBNb24sIEp1bCAwNCwgMjAyMiBhdCAxMDozNDow N1BNICswODAwLCBndWFuZ2h1aS5mZ2ggd3JvdGU6Cj4gPiA+IFRoYW5rcy4KPiA+ID4KPiA+ID4g 5ZyoIDIwMjIvNy80IDIyOjIzLCBXaWxsIERlYWNvbiDlhpnpgZM6Cj4gPiA+ID4gT24gTW9uLCBK dWwgMDQsIDIwMjIgYXQgMTA6MTE6MjdQTSArMDgwMCwgZ3VhbmdodWkuZmdoIHdyb3RlOgo+IC4u Lgo+ID4gPiA+ID4gTmFtZWx5LCBpdCdzIG5lZWQgdG8gdXNlIG5vbiBibG9jay9zZWN0aW9uIG1h cHBpbmcgZm9yIGNyYXNoa2VybmVsIG1lbQo+ID4gPiA+ID4gYmVmb3JlIHNocmluZ2tpbmcuCj4g PiA+ID4KPiA+ID4gPiBXZWxsLCB5ZXMsIGJ1dCB3ZSBjYW4gY2hhbmdlIGFyY2hfa2V4ZWNfW3Vu XXByb3RlY3RfY3Jhc2hrcmVzKCkgbm90IHRvIGRvCj4gPiA+ID4gdGhhdCBpZiB3ZSdyZSBsZWF2 aW5nIHRoZSB0aGluZyBtYXBwZWQsIG5vPwo+ID4gPiA+Cj4gPiA+IEkgdGhpbmsgd2Ugc2hvdWxk IHVzZSBhcmNoX2tleGVjX1t1bl1wcm90ZWN0X2NyYXNoa3JlcyBmb3IgY3Jhc2hrZXJuZWwgbWVt Lgo+ID4gPgo+ID4gPiBCZWNhdXNlIHdoZW4gaW52YWxpZCBjcmFzaGtlcm5lbCBtZW0gcGFnZXRh YmxlLCB0aGVyZSBpcyBubyBjaGFuY2UgdG8gcmQvd3IKPiA+ID4gdGhlIGNyYXNoa2VybmVsIG1l bSBieSBtaXN0YWtlLgo+ID4gPgo+ID4gPiBJZiB3ZSBkb24ndCB1c2UgYXJjaF9rZXhlY19bdW5d cHJvdGVjdF9jcmFzaGtyZXMgdG8gaW52YWxpZCBjcmFzaGtlcm5lbCBtZW0KPiA+ID4gcGFnZXRh YmxlLCB0aGVyZSBtYXliZSBzb21lIHdyaXRlIG9wZXJhdGlvbnMgdG8gdGhlc2UgbWVtIGJ5IG1p c3Rha2Ugd2hpY2gKPiA+ID4gbWF5IGNhdXNlIGNyYXNoa2VybmVsIGJvb3QgZXJyb3IgYW5kIHZt Y29yZSBzYXZpbmcgZXJyb3IuCj4gPgo+ID4gSSBkb24ndCByZWFsbHkgYnV5IHRoaXMgbGluZSBv ZiByZWFzb25pbmcuIFRoZSBlbnRpcmUgbWFpbiBrZXJuZWwgaXMKPiA+IHdyaXRhYmxlLCBzbyB3 aHkgZG8gd2UgY2FyZSBhYm91dCBwcm90ZWN0aW5nIHRoZSBjcmFzaGtlcm5lbCBzbyBtdWNoPyBU aGUKPiA+IF9jb2RlXyB0byBsYXVuY2ggdGhlIGNyYXNoIGtlcm5lbCBpcyB3cml0YWJsZSEgSWYg eW91IGNhcmUgYWJvdXQgcHJldmVudGluZwo+ID4gd3JpdGVzIHRvIG1lbW9yeSB3aGljaCBzaG91 bGQgbm90IGJlIHdyaXRhYmxlLCB0aGVuIHlvdSBzaG91bGQgdXNlCj4gPiByb2RhdGE9ZnVsbC4K PiA+Cj4gCj4gVGhpcyBpcyBub3QgZW50aXJlbHkgdHJ1ZSAtIHRoZSBjb3JlIGtlcm5lbCB0ZXh0 IGFuZCByb2RhdGEgYXJlCj4gcmVtYXBwZWQgci9vIGluIHRoZSBsaW5lYXIgbWFwLCB3aGVyZWFz IGFsbCBtb2R1bGUgY29kZSBhbmQgcm9kYXRhIGFyZQo+IGxlZnQgd3JpdGFibGUgd2hlbiByb2Rh dGEgIT0gZnVsbC4KClllcywgc29ycnksIHlvdSdyZSBxdWl0ZSByaWdodC4gVGhlIGtlcm5lbCB0 ZXh0IGlzIG9ubHkgd3JpdGFibGUgaWYKcm9kYXRhPW9mZi4KCkJ1dCBJIHN0aWxsIHRoaW5rIGl0 IG1ha2VzIHNlbnNlIHRvIHByb3RlY3QgdGhlIGNyYXNoa2VybmVsIG9ubHkgaWYKcm9kYXRhPWZ1 bGwgKHdoaWNoIGlzIHRoZSBkZWZhdWx0IG9uIGFybTY0KSBhcyB0aGlzIGFsbG93cyB1cyB0byBy ZWx5Cm9uIHBhZ2UgbWFwcGluZ3MgYW5kIEkgdGhpbmsgZml0cyB3ZWxsIHdpdGggd2hhdCB3ZSBk byBmb3IgbW9kdWxlcy4KCj4gQnV0IHRoZSBjb25jbHVzaW9uIGlzIHRoZSBzYW1lLCBpbW86IGlm IHlvdSBjYW4ndCBiZSBib3RoZXJlZCB0bwo+IHByb3RlY3QgYSBnb29kIGNodW5rIG9mIHRoZSBj b2RlIGFuZCByb2RhdGEgdGhhdCB0aGUga2VybmVsIHJlbGllcyBvbiwKPiB3aHkgc2hvdWxkIHRo ZSBjcmFzaGtlcm5lbCBiZSB0cmVhdGVkIGFueSBkaWZmZXJlbnRseT8KClRoYW5rcy4KCldpbGwK Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFy bS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9y ZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1r ZXJuZWwK