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=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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 539B5C4338F for ; Tue, 10 Aug 2021 21:18:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E257760F02 for ; Tue, 10 Aug 2021 21:18:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E257760F02 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 5A3E16B0071; Tue, 10 Aug 2021 17:18:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 552408D0002; Tue, 10 Aug 2021 17:18:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 441358D0001; Tue, 10 Aug 2021 17:18:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0189.hostedemail.com [216.40.44.189]) by kanga.kvack.org (Postfix) with ESMTP id 2A8F56B0071 for ; Tue, 10 Aug 2021 17:18:04 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id D7641231BF for ; Tue, 10 Aug 2021 21:18:03 +0000 (UTC) X-FDA: 78460433646.15.0B6CFCC Received: from mail-lf1-f48.google.com (mail-lf1-f48.google.com [209.85.167.48]) by imf18.hostedemail.com (Postfix) with ESMTP id 9132B4005BE7 for ; Tue, 10 Aug 2021 21:18:03 +0000 (UTC) Received: by mail-lf1-f48.google.com with SMTP id g13so667163lfj.12 for ; Tue, 10 Aug 2021 14:18:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=O2QGnhDG5CSFWe5z6crf4E+5alhrIaUs/gP83zlfZBI=; b=tmtzT47381evbjLQpTnvmFQRXXJoB0NJyL05u/jg9ydoMZmqZfePU27QxbY2NHMkGQ BmkLyxl3a17yBIMTkZ3LibcLX3p2A1P12Zo+OfdjNFNjmV6TfTEMAeHFD/DYo9JMx0p4 8X8miZg5EpID649V56KR7uqqin/BJBd9lXkLY9LvT2MRXekvFfRcNuafav08Kf/nzRBr MKt+Co7QjoJs3v88DUtKg9TRg68c2ztvNeQQLu7PNcCg/cRU7mdChqxSZTGFkDRqNmtz PrGpq3lRIg2jGO/S2B0+Q0aHrtdeQ5Wy/+OHlwrMxQF/PYnsqyjrAAskVkGPyQFWD/Ix JwCA== 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=O2QGnhDG5CSFWe5z6crf4E+5alhrIaUs/gP83zlfZBI=; b=oy7dhon56LLd0P/k9QiSpefdY0N7rtGLKahhyIn4ZzB9wWbFhhA6eeqx3PpAOZEP+D 2u8RGUjT3iJPGl1WYv2UbYNqOnpNXG3jWwRju9hXxlDvXbiHfN8yZYf/BR/TIcd6B2Fh GphsNgnmnlZYHI73inII8V0WgMtpXpNPKu2gxDVNhUIhWX2N00wuNp5oFYeKdpb7bj1E mBrbXEWMIer6qnBjsXGmBvebUXm9JvFTIvLvkrhimGxMofUQz7tQ0mGOnXN3jEdaUZEc qw1KvwMGOdKGbr8mWKhfKNK9JsxF4TZyI4cOC9Eu2VObKvrh5namlIipQMBDF2XWPM8n 1EMw== X-Gm-Message-State: AOAM530MsEdc64RQvaF9Ag3z05xVG+nFCkdWRZAvbRoNLuqJzOTV2sNP JoNxvRsqNV2eZeG813NLyb+GNgAGX1Dwpnk+ttr9EQ== X-Google-Smtp-Source: ABdhPJwSjT1TOy4jCVN4TEDzLsf9wTHNWPDJhQA1WEafUY3JEYUClPK0FKoIycqvFSxxCvh4e3tHkWoLmG9QtQ/EgPg= X-Received: by 2002:a05:6512:23a7:: with SMTP id c39mr23004537lfv.358.1628630282092; Tue, 10 Aug 2021 14:18:02 -0700 (PDT) MIME-Version: 1.0 References: <20210809223740.59009-1-npache@redhat.com> In-Reply-To: From: Shakeel Butt Date: Tue, 10 Aug 2021 14:17:50 -0700 Message-ID: Subject: Re: [PATCH v3] vm_swappiness=0 should still try to avoid swapping anon memory To: Nico Pache Cc: Johannes Weiner , Linux MM , Andrew Morton , LKML , Rafael Aquini , Waiman Long , Michal Hocko , hakavlad@inbox.lv Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 9132B4005BE7 Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=tmtzT473; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf18.hostedemail.com: domain of shakeelb@google.com designates 209.85.167.48 as permitted sender) smtp.mailfrom=shakeelb@google.com X-Stat-Signature: 9m8fbkjpesr1hhxcs5xu5du93se9939u X-HE-Tag: 1628630283-381547 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 Tue, Aug 10, 2021 at 12:24 PM Nico Pache wrote: > > [...] > > > > I'm wondering how you're getting anon scans with swappiness=0. If you > > look at get_scan_count(), SCAN_FRACT with swappines=0 should always > > result in ap = fraction[0] = 0, which never yields any anon scan > > targets. So I'm thinking you're running into sc->file_is_tiny > > situations, meaning remaining file pages alone are not enough to > > restore watermarks anymore. Is that possible? > > Yes DEACTIVATE_ANON is enabling the file_is_tiny case in shrink_node(). That is what im trying to prevent in the swappiness=0 case. > Can you please explain how DEACTIVATE_ANON is enabling the file_is_tiny case?