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[209.85.167.52]) by smtp.gmail.com with ESMTPSA id y23sm1528834ljc.119.2020.12.19.12.08.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 19 Dec 2020 12:08:38 -0800 (PST) Received: by mail-lf1-f52.google.com with SMTP id l11so14369478lfg.0 for ; Sat, 19 Dec 2020 12:08:37 -0800 (PST) X-Received: by 2002:ac2:4987:: with SMTP id f7mr3561966lfl.41.1608408517290; Sat, 19 Dec 2020 12:08:37 -0800 (PST) MIME-Version: 1.0 References: <20201210150828.4b7pg5lx666r7l2u@black.fi.intel.com> <20201214160724.ewhjqoi32chheone@box> <20201216170703.o5lpsnjfmoj7f3ml@box> <20201217105409.2gacwgg7rco2ft3m@box> <20201218110400.yve45r3zsv7qgfa3@box> <20201219124103.w6isern3ywc7xbur@box> In-Reply-To: <20201219124103.w6isern3ywc7xbur@box> From: Linus Torvalds Date: Sat, 19 Dec 2020 12:08:21 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/2] mm: Allow architectures to request 'old' entries when prefaulting To: "Kirill A. Shutemov" Cc: Matthew Wilcox , "Kirill A. Shutemov" , Will Deacon , Linux Kernel Mailing List , Linux-MM , Linux ARM , Catalin Marinas , Jan Kara , Minchan Kim , Andrew Morton , Vinayak Menon , Android Kernel Team Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Dec 19, 2020 at 4:41 AM Kirill A. Shutemov wrote: > > Okay, but we only win the NULL check. xas_retry() and xa_is_value() has to > be repeated in the beginning of the loop. Yeah. I wonder if it might make sense to have a "xas_next_entry_rcu()" function that does something like while ((entry = xas_next_entry(&xas, end)) != NULL) { if (xas_retry(entry) || xa_is_value(entry)) continue; return entry; } return NULL; but that's a question for Willy, and independent of this patch. I like the patch, and I'll think about it a bit more, but I might decide to just apply it to get this thing over with. Otherwise it should probably go into -mm for more testing. Linus 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 X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01DB6C4361B for ; Sat, 19 Dec 2020 20:08:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 707642343E for ; Sat, 19 Dec 2020 20:08:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 707642343E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 627ED6B005C; Sat, 19 Dec 2020 15:08:43 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5DBD16B005D; Sat, 19 Dec 2020 15:08:43 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4CB6F6B0068; Sat, 19 Dec 2020 15:08:43 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0160.hostedemail.com [216.40.44.160]) by kanga.kvack.org (Postfix) with ESMTP id 360D36B005C for ; Sat, 19 Dec 2020 15:08:43 -0500 (EST) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 02A52180AD807 for ; Sat, 19 Dec 2020 20:08:43 +0000 (UTC) X-FDA: 77611119726.03.clam11_1402f1b27448 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id D35A528A4EA for ; Sat, 19 Dec 2020 20:08:42 +0000 (UTC) X-HE-Tag: clam11_1402f1b27448 X-Filterd-Recvd-Size: 4906 Received: from mail-lf1-f42.google.com (mail-lf1-f42.google.com [209.85.167.42]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Sat, 19 Dec 2020 20:08:42 +0000 (UTC) Received: by mail-lf1-f42.google.com with SMTP id a12so14282768lfl.6 for ; Sat, 19 Dec 2020 12:08:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=SVODdPybrlcbXNP7lCnqd5UusuAf6ILXOIXCJqNGVzA=; b=Vi+1ed9OKjtopsq+1bVnAurIL+SBBBmWE1yCd+bEWojjNIE5+ScQRteZg58le8psS+ OGMgdv+vJwa8mhGIBiS2tBURhTt+WaaxRTNSsg8GVUONtSKPyRqWQUC9+pmlV1GECXio vXXjflwYbXnkzPzO43btJGKJJDEDqSKDZTI04= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=SVODdPybrlcbXNP7lCnqd5UusuAf6ILXOIXCJqNGVzA=; b=pscw48TrJLmcxQOoe4iENfTAWa3beD5Ee/6lC3DsCV2PJjMEoIewTXT5r63pvk5LGV Pe6usU/i2iq4cWFpDvVkxCMVeGDcyy/FaB+1AmaLVOTH3SepCbVLaUisA6aNRZso2Bmd +bF1vzh6/K4o4pRQYA1byBc6h+EqxrVazP2yQ3QJd3x9+zJTSAeikotZyZPn563FkxN1 BZVKqs8AYsL9YsZzZbz/k/NQJbRWdPyw9L4R5MM6q+B8U9nYvgJBpiXeoxc/LXtqFa0r yLlewUpCKMysF9i7a0LZeIRxspfssdXYRPpF5S7WnfJ42gD/Ctg1uh3eSzjmR2TiqAWa e0OQ== X-Gm-Message-State: AOAM5338SkvbYC1pFKnduNEV9weW6ub1O0Zi4wd6Q1Gd0qruY/6cEm6p AytUAvRjcr0Yht3Ip55B4sCwS/TRtonPJQ== X-Google-Smtp-Source: ABdhPJwHaOcMu0Nz6NQl6baxfydhukGJDkE1JM6f3O3b1YPOPF8H7G6FrwmOwX17/dQV0eD9qkLaKA== X-Received: by 2002:a2e:9849:: with SMTP id e9mr4347351ljj.319.1608408520510; Sat, 19 Dec 2020 12:08:40 -0800 (PST) Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com. [209.85.167.44]) by smtp.gmail.com with ESMTPSA id q25sm1405775lfd.282.2020.12.19.12.08.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 19 Dec 2020 12:08:38 -0800 (PST) Received: by mail-lf1-f44.google.com with SMTP id o19so14350985lfo.1 for ; Sat, 19 Dec 2020 12:08:37 -0800 (PST) X-Received: by 2002:ac2:4987:: with SMTP id f7mr3561966lfl.41.1608408517290; Sat, 19 Dec 2020 12:08:37 -0800 (PST) MIME-Version: 1.0 References: <20201210150828.4b7pg5lx666r7l2u@black.fi.intel.com> <20201214160724.ewhjqoi32chheone@box> <20201216170703.o5lpsnjfmoj7f3ml@box> <20201217105409.2gacwgg7rco2ft3m@box> <20201218110400.yve45r3zsv7qgfa3@box> <20201219124103.w6isern3ywc7xbur@box> In-Reply-To: <20201219124103.w6isern3ywc7xbur@box> From: Linus Torvalds Date: Sat, 19 Dec 2020 12:08:21 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/2] mm: Allow architectures to request 'old' entries when prefaulting To: "Kirill A. Shutemov" Cc: Matthew Wilcox , "Kirill A. Shutemov" , Will Deacon , Linux Kernel Mailing List , Linux-MM , Linux ARM , Catalin Marinas , Jan Kara , Minchan Kim , Andrew Morton , Vinayak Menon , Android Kernel Team Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Dec 19, 2020 at 4:41 AM Kirill A. Shutemov wrote: > > Okay, but we only win the NULL check. xas_retry() and xa_is_value() has to > be repeated in the beginning of the loop. Yeah. I wonder if it might make sense to have a "xas_next_entry_rcu()" function that does something like while ((entry = xas_next_entry(&xas, end)) != NULL) { if (xas_retry(entry) || xa_is_value(entry)) continue; return entry; } return NULL; but that's a question for Willy, and independent of this patch. I like the patch, and I'll think about it a bit more, but I might decide to just apply it to get this thing over with. Otherwise it should probably go into -mm for more testing. Linus 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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41789C4361B for ; Sat, 19 Dec 2020 20:10:16 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E8C5723443 for ; Sat, 19 Dec 2020 20:10:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E8C5723443 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:To:Subject:Message-ID:Date:From:In-Reply-To: References:MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=cXQdvD3wKDE+RcqAD0XtcQTfxROjYLbnDzkj3p1uhW8=; b=oH4RZb9BHvBZDQNbQeL9T+Bxj RYZtLFf6knBVyjjnxvgmNTOZhYbJs690CEX2cMk8g4V+oaI4hKxX0bPZe3+TAxA2yi7C+3Y8XLYQH VqbK8R1+p9Wg+w2h2xAIBfuxPmSKNVKtIGB0/rMzl1nhVAABlV/IJFerhfbBcR3CPwSc1TmjytCTI F6Zu8utmqjYiZlaAzORP7aAGmPTk2v23cCf05WNFG4yZ3UGpnjntqqgUA/7URJcfhkCXzvS807a75 sUGPUB958m+J8jjufgkKZp4dAjqkQ55YusjXN6t+aLpcn63DkHA9sHswV3h4OfuPc9AZMVm9WSV/y uWSXSyVTQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kqiX0-0007F1-QF; Sat, 19 Dec 2020 20:08:46 +0000 Received: from mail-lf1-x129.google.com ([2a00:1450:4864:20::129]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kqiWw-0007ED-TY for linux-arm-kernel@lists.infradead.org; Sat, 19 Dec 2020 20:08:44 +0000 Received: by mail-lf1-x129.google.com with SMTP id h22so4752767lfu.2 for ; Sat, 19 Dec 2020 12:08:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=SVODdPybrlcbXNP7lCnqd5UusuAf6ILXOIXCJqNGVzA=; b=Vi+1ed9OKjtopsq+1bVnAurIL+SBBBmWE1yCd+bEWojjNIE5+ScQRteZg58le8psS+ OGMgdv+vJwa8mhGIBiS2tBURhTt+WaaxRTNSsg8GVUONtSKPyRqWQUC9+pmlV1GECXio vXXjflwYbXnkzPzO43btJGKJJDEDqSKDZTI04= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=SVODdPybrlcbXNP7lCnqd5UusuAf6ILXOIXCJqNGVzA=; b=bhcGQ/buCYf0Ps+XqBeyE6+l0Q+daUQe1eSCeQSm/fLjRT3DEfbAdNnQ7M8k9ikvMi Ljqlg9N5TD2Nf3w0+Dwsb4e0PzC0t1j3BgIYW28QWvAy1up2OWnpQVMdHg5gYiqIA3w9 lfyqwQXT7MS3XztW8g5dQSxcLbI80DWr8ahkuq8S90jd0fUREhwDqTkaI7lSx7p7uLkp tK4X2VgU2AYkgHy6SCO+OVJzIDECtl4fzpKvXbU5dZAHbAUvLZ1G8HKlZ7hSsHWky2UE WnnFzBdVaeEdw87WGMjF7kY0e5va+6aedOOsqeDKtlmfH7pDJIhkwLfQhVnrtgB15C2b S78Q== X-Gm-Message-State: AOAM532pNXm1xq1oqe6zJmAqbUTy0tw/PGiW+R7HGUUSbkT7B8vYGLuJ Mclzx5B5Zt18EUfah2093yPPgpWFZHjebw== X-Google-Smtp-Source: ABdhPJzVqfAkdYi2apedyo0WJjUIq5JAFCvKwsnHfKMgMAlx+HwAmwxhvQZGuLqLWAVlUT0s0UMeIg== X-Received: by 2002:a2e:94d0:: with SMTP id r16mr4343219ljh.123.1608408519855; Sat, 19 Dec 2020 12:08:39 -0800 (PST) Received: from mail-lf1-f54.google.com (mail-lf1-f54.google.com. [209.85.167.54]) by smtp.gmail.com with ESMTPSA id o187sm1403313lfa.39.2020.12.19.12.08.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 19 Dec 2020 12:08:38 -0800 (PST) Received: by mail-lf1-f54.google.com with SMTP id 23so14231427lfg.10 for ; Sat, 19 Dec 2020 12:08:37 -0800 (PST) X-Received: by 2002:ac2:4987:: with SMTP id f7mr3561966lfl.41.1608408517290; Sat, 19 Dec 2020 12:08:37 -0800 (PST) MIME-Version: 1.0 References: <20201210150828.4b7pg5lx666r7l2u@black.fi.intel.com> <20201214160724.ewhjqoi32chheone@box> <20201216170703.o5lpsnjfmoj7f3ml@box> <20201217105409.2gacwgg7rco2ft3m@box> <20201218110400.yve45r3zsv7qgfa3@box> <20201219124103.w6isern3ywc7xbur@box> In-Reply-To: <20201219124103.w6isern3ywc7xbur@box> From: Linus Torvalds Date: Sat, 19 Dec 2020 12:08:21 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/2] mm: Allow architectures to request 'old' entries when prefaulting To: "Kirill A. Shutemov" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201219_150843_185118_C72C3435 X-CRM114-Status: GOOD ( 14.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Android Kernel Team , Jan Kara , Minchan Kim , Catalin Marinas , Linux Kernel Mailing List , Matthew Wilcox , Linux-MM , Vinayak Menon , "Kirill A. Shutemov" , Andrew Morton , Will Deacon , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Dec 19, 2020 at 4:41 AM Kirill A. Shutemov wrote: > > Okay, but we only win the NULL check. xas_retry() and xa_is_value() has to > be repeated in the beginning of the loop. Yeah. I wonder if it might make sense to have a "xas_next_entry_rcu()" function that does something like while ((entry = xas_next_entry(&xas, end)) != NULL) { if (xas_retry(entry) || xa_is_value(entry)) continue; return entry; } return NULL; but that's a question for Willy, and independent of this patch. I like the patch, and I'll think about it a bit more, but I might decide to just apply it to get this thing over with. Otherwise it should probably go into -mm for more testing. Linus _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel