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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 30906C0650F for ; Mon, 5 Aug 2019 10:57:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CAF2820880 for ; Mon, 5 Aug 2019 10:57:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CAF2820880 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1B4A36B0003; Mon, 5 Aug 2019 06:57:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 163C76B0005; Mon, 5 Aug 2019 06:57:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 02D646B0006; Mon, 5 Aug 2019 06:57:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by kanga.kvack.org (Postfix) with ESMTP id A4E7B6B0003 for ; Mon, 5 Aug 2019 06:57:57 -0400 (EDT) Received: by mail-ed1-f72.google.com with SMTP id y15so51310230edu.19 for ; Mon, 05 Aug 2019 03:57:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:subject:from :to:cc:references:openpgp:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=0VN52/LJgn1shDqtBlz7fZKLxhCRXnUcD70BD9CImmc=; b=GpwWtsUxpoaaLQo5eeMplTrrBH+aHCGWeE1w5MQXdApE6o/6BDeXiJQ2jM6UAY98Qw JZc/lXoXlpEJ9XXKKMhGJ9xTnK+givTLIDlyPAZSg++0C0spRZFxfpcDBuBkyf4/rKpo lVbxaL6m0hSlnSavlCTrrWvJuMIaDblcRbp4rC2XoR9egUjwZrl/7lFw45ma/k2QoLM6 L+SCNHI3WTrIauz9APLrzXSutIurPMqVeGt52HF2U4M9QPJayCIWoAdtSxmIVA5uQi4d +MIW+d3zhnz8+1FrfkCiSfZkzIPmRneM44n2P6BNii9fDngMtmBSmDG3B9Y0nwyEF5xv gaog== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Gm-Message-State: APjAAAUpx7WiTfgWifChkB8uyI1TfOnv+cItVoENnh0fN5aOykHOBNNi T3Z3H7CnXXz8/7lh92RG0+EfaXcUu9kqCmtdmUtACYf+CuzWXTSwPQOWMfOXRUt6Lv6CG15dm2h dun2pEpcSbKmDUs4uTjYYT+zCzZ96PSc/lHr4Z/p5NYcHDELhRGBawnw0i3DQs8vtDQ== X-Received: by 2002:a17:906:ad82:: with SMTP id la2mr50904049ejb.123.1565002677199; Mon, 05 Aug 2019 03:57:57 -0700 (PDT) X-Google-Smtp-Source: APXvYqy/NPMicZOxpBYhD10P3UIL0W4JDiFz4Ab1nYFZ7CYMC9mFl+uqOCq5SulDaOzna65lvxGn X-Received: by 2002:a17:906:ad82:: with SMTP id la2mr50903989ejb.123.1565002675803; Mon, 05 Aug 2019 03:57:55 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1565002675; cv=none; d=google.com; s=arc-20160816; b=o6Tu2Z3g/WkqtAsUdFJy0wxxUJhRYeoslPi2srAr9igh9RkTzO6MT1OdNEAYTljLRX FIAoKyhWFf6IV6VZ51smroi8+24rdD3BT5HHj03NVspJ0Hd4aY7cKxspSeurK/D47abS 8s01Yl64+Hd3dAdfmsrzkHwZfZInMQp5ebg5dS2NNQ7n3XywE17CnzvIvMEN0km6iZAj d277iEGpSTYSPOmtRH6lk2d/G1t5sB+LAZzNWWUb74n+qIt80IVAu53h0N6JuqXWegd2 U4uY3eawDBe0kvrNKt4ului+GzZg3Tb4/NLApi1lSjOuF063YvWExvepNYymS1cC0+PT Wd6g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:autocrypt:openpgp:references:cc:to:from :subject; bh=0VN52/LJgn1shDqtBlz7fZKLxhCRXnUcD70BD9CImmc=; b=x1cHgfugEFx62Jnl0beayJ6LJ/+qCDDanLBmsEnYTRi0SpwmrlUo8YUl8Jc7k8Hrfk Wz7yu60/2n9UYFXVJDIzmTD9C37oX4tF7+wcpep8v42wGpfVSKgQHRVFUc9wkTw6Gr65 9VU+Wdukkb130yzzf7JTKXHilBNRCW1h8/6BQg0BoPozyfJfERZ2bpMkkdh3CXyaNJyg 8t1zR9LXWLg3fME4HwY9HvhNC6Hq8Xn5u8mBUN+DWRP49NV29QCfgFpPmtH4liqZ7LU0 4EO2djKoLHyv4cdvl7xXf4fu5YMjiOyK0bvBApjxJPGPkxMdFr3ODcv7jReJK8SdGCo7 ZBzw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id f6si17782458edd.395.2019.08.05.03.57.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 05 Aug 2019 03:57:55 -0700 (PDT) Received-SPF: pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 907BFB623; Mon, 5 Aug 2019 10:57:54 +0000 (UTC) Subject: Re: [PATCH 1/3] mm, reclaim: make should_continue_reclaim perform dryrun detection From: Vlastimil Babka To: Mike Kravetz , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Hillf Danton , Michal Hocko , Mel Gorman , Johannes Weiner , Andrea Arcangeli , David Rientjes , Andrew Morton References: <20190802223930.30971-1-mike.kravetz@oracle.com> <20190802223930.30971-2-mike.kravetz@oracle.com> Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; prefer-encrypt=mutual; keydata= mQINBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABtCBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PokCVAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJcbbyGBQkH8VTqAAoJECJPp+fMgqZkpGoP /1jhVihakxw1d67kFhPgjWrbzaeAYOJu7Oi79D8BL8Vr5dmNPygbpGpJaCHACWp+10KXj9yz fWABs01KMHnZsAIUytVsQv35DMMDzgwVmnoEIRBhisMYOQlH2bBn/dqBjtnhs7zTL4xtqEcF 1hoUFEByMOey7gm79utTk09hQE/Zo2x0Ikk98sSIKBETDCl4mkRVRlxPFl4O/w8dSaE4eczH LrKezaFiZOv6S1MUKVKzHInonrCqCNbXAHIeZa3JcXCYj1wWAjOt9R3NqcWsBGjFbkgoKMGD usiGabetmQjXNlVzyOYdAdrbpVRNVnaL91sB2j8LRD74snKsV0Wzwt90YHxDQ5z3M75YoIdl byTKu3BUuqZxkQ/emEuxZ7aRJ1Zw7cKo/IVqjWaQ1SSBDbZ8FAUPpHJxLdGxPRN8Pfw8blKY 8mvLJKoF6i9T6+EmlyzxqzOFhcc4X5ig5uQoOjTIq6zhLO+nqVZvUDd2Kz9LMOCYb516cwS/ Enpi0TcZ5ZobtLqEaL4rupjcJG418HFQ1qxC95u5FfNki+YTmu6ZLXy+1/9BDsPuZBOKYpUm 3HWSnCS8J5Ny4SSwfYPH/JrtberWTcCP/8BHmoSpS/3oL3RxrZRRVnPHFzQC6L1oKvIuyXYF rkybPXYbmNHN+jTD3X8nRqo+4Qhmu6SHi3VquQENBFsZNQwBCACuowprHNSHhPBKxaBX7qOv KAGCmAVhK0eleElKy0sCkFghTenu1sA9AV4okL84qZ9gzaEoVkgbIbDgRbKY2MGvgKxXm+kY n8tmCejKoeyVcn9Xs0K5aUZiDz4Ll9VPTiXdf8YcjDgeP6/l4kHb4uSW4Aa9ds0xgt0gP1Xb AMwBlK19YvTDZV5u3YVoGkZhspfQqLLtBKSt3FuxTCU7hxCInQd3FHGJT/IIrvm07oDO2Y8J DXWHGJ9cK49bBGmK9B4ajsbe5GxtSKFccu8BciNluF+BqbrIiM0upJq5Xqj4y+Xjrpwqm4/M ScBsV0Po7qdeqv0pEFIXKj7IgO/d4W2bABEBAAGJA3IEGAEKACYWIQSpQNQ0mSwujpkQPVAi T6fnzIKmZAUCWxk1DAIbAgUJA8JnAAFACRAiT6fnzIKmZMB0IAQZAQoAHRYhBKZ2GgCcqNxn k0Sx9r6Fd25170XjBQJbGTUMAAoJEL6Fd25170XjDBUH/2jQ7a8g+FC2qBYxU/aCAVAVY0NE YuABL4LJ5+iWwmqUh0V9+lU88Cv4/G8fWwU+hBykSXhZXNQ5QJxyR7KWGy7LiPi7Cvovu+1c 9Z9HIDNd4u7bxGKMpn19U12ATUBHAlvphzluVvXsJ23ES/F1c59d7IrgOnxqIcXxr9dcaJ2K k9VP3TfrjP3g98OKtSsyH0xMu0MCeyewf1piXyukFRRMKIErfThhmNnLiDbaVy6biCLx408L Mo4cCvEvqGKgRwyckVyo3JuhqreFeIKBOE1iHvf3x4LU8cIHdjhDP9Wf6ws1XNqIvve7oV+w B56YWoalm1rq00yUbs2RoGcXmtX1JQ//aR/paSuLGLIb3ecPB88rvEXPsizrhYUzbe1TTkKc 4a4XwW4wdc6pRPVFMdd5idQOKdeBk7NdCZXNzoieFntyPpAq+DveK01xcBoXQ2UktIFIsXey uSNdLd5m5lf7/3f0BtaY//f9grm363NUb9KBsTSnv6Vx7Co0DWaxgC3MFSUhxzBzkJNty+2d 10jvtwOWzUN+74uXGRYSq5WefQWqqQNnx+IDb4h81NmpIY/X0PqZrapNockj3WHvpbeVFAJ0 9MRzYP3x8e5OuEuJfkNnAbwRGkDy98nXW6fKeemREjr8DWfXLKFWroJzkbAVmeIL0pjXATxr +tj5JC0uvMrrXefUhXTo0SNoTsuO/OsAKOcVsV/RHHTwCDR2e3W8mOlA3QbYXsscgjghbuLh J3oTRrOQa8tUXWqcd5A0+QPo5aaMHIK0UAthZsry5EmCY3BrbXUJlt+23E93hXQvfcsmfi0N rNh81eknLLWRYvMOsrbIqEHdZBT4FHHiGjnck6EYx/8F5BAZSodRVEAgXyC8IQJ+UVa02QM5 D2VL8zRXZ6+wARKjgSrW+duohn535rG/ypd0ctLoXS6dDrFokwTQ2xrJiLbHp9G+noNTHSan ExaRzyLbvmblh3AAznb68cWmM3WVkceWACUalsoTLKF1sGrrIBj5updkKkzbKOq5gcC5AQ0E Wxk1NQEIAJ9B+lKxYlnKL5IehF1XJfknqsjuiRzj5vnvVrtFcPlSFL12VVFVUC2tT0A1Iuo9 NAoZXEeuoPf1dLDyHErrWnDyn3SmDgb83eK5YS/K363RLEMOQKWcawPJGGVTIRZgUSgGusKL NuZqE5TCqQls0x/OPljufs4gk7E1GQEgE6M90Xbp0w/r0HB49BqjUzwByut7H2wAdiNAbJWZ F5GNUS2/2IbgOhOychHdqYpWTqyLgRpf+atqkmpIJwFRVhQUfwztuybgJLGJ6vmh/LyNMRr8 J++SqkpOFMwJA81kpjuGR7moSrUIGTbDGFfjxmskQV/W/c25Xc6KaCwXah3OJ40AEQEAAYkC PAQYAQoAJhYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJbGTU1AhsMBQkDwmcAAAoJECJPp+fM gqZkPN4P/Ra4NbETHRj5/fM1fjtngt4dKeX/6McUPDIRuc58B6FuCQxtk7sX3ELs+1+w3eSV rHI5cOFRSdgw/iKwwBix8D4Qq0cnympZ622KJL2wpTPRLlNaFLoe5PkoORAjVxLGplvQIlhg miljQ3R63ty3+MZfkSVsYITlVkYlHaSwP2t8g7yTVa+q8ZAx0NT9uGWc/1Sg8j/uoPGrctml hFNGBTYyPq6mGW9jqaQ8en3ZmmJyw3CHwxZ5FZQ5qc55xgshKiy8jEtxh+dgB9d8zE/S/UGI E99N/q+kEKSgSMQMJ/CYPHQJVTi4YHh1yq/qTkHRX+ortrF5VEeDJDv+SljNStIxUdroPD29 2ijoaMFTAU+uBtE14UP5F+LWdmRdEGS1Ah1NwooL27uAFllTDQxDhg/+LJ/TqB8ZuidOIy1B xVKRSg3I2m+DUTVqBy7Lixo73hnW69kSjtqCeamY/NSu6LNP+b0wAOKhwz9hBEwEHLp05+mj 5ZFJyfGsOiNUcMoO/17FO4EBxSDP3FDLllpuzlFD7SXkfJaMWYmXIlO0jLzdfwfcnDzBbPwO hBM8hvtsyq8lq8vJOxv6XD6xcTtj5Az8t2JjdUX6SF9hxJpwhBU0wrCoGDkWp4Bbv6jnF7zP Nzftr4l8RuJoywDIiJpdaNpSlXKpj/K6KrnyAI/joYc7 Message-ID: <0d31cc14-13cd-13e0-cf2d-dd8a8d3049ff@suse.cz> Date: Mon, 5 Aug 2019 12:57:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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 8/5/19 10:42 AM, Vlastimil Babka wrote: > On 8/3/19 12:39 AM, Mike Kravetz wrote: >> From: Hillf Danton >> >> Address the issue of should_continue_reclaim continuing true too often >> for __GFP_RETRY_MAYFAIL attempts when !nr_reclaimed and nr_scanned. >> This could happen during hugetlb page allocation causing stalls for >> minutes or hours. >> >> We can stop reclaiming pages if compaction reports it can make a progress. >> A code reshuffle is needed to do that. > >> And it has side-effects, however, >> with allocation latencies in other cases but that would come at the cost >> of potential premature reclaim which has consequences of itself. > > Based on Mel's longer explanation, can we clarify the wording here? e.g.: > > There might be side-effect for other high-order allocations that would > potentially benefit from more reclaim before compaction for them to be > faster and less likely to stall, but the consequences of > premature/over-reclaim are considered worse. > >> We can also bail out of reclaiming pages if we know that there are not >> enough inactive lru pages left to satisfy the costly allocation. >> >> We can give up reclaiming pages too if we see dryrun occur, with the >> certainty of plenty of inactive pages. IOW with dryrun detected, we are >> sure we have reclaimed as many pages as we could. >> >> Cc: Mike Kravetz >> Cc: Mel Gorman >> Cc: Michal Hocko >> Cc: Vlastimil Babka >> Cc: Johannes Weiner >> Signed-off-by: Hillf Danton >> Tested-by: Mike Kravetz >> Acked-by: Mel Gorman > > Acked-by: Vlastimil Babka > I will send some followup cleanup. How about this? ----8<---- >From 0040b32462587171ad22395a56699cc036ad483f Mon Sep 17 00:00:00 2001 From: Vlastimil Babka Date: Mon, 5 Aug 2019 12:49:40 +0200 Subject: [PATCH] mm, reclaim: cleanup should_continue_reclaim() After commit "mm, reclaim: make should_continue_reclaim perform dryrun detection", closer look at the function shows, that nr_reclaimed == 0 means the function will always return false. And since non-zero nr_reclaimed implies non_zero nr_scanned, testing nr_scanned serves no purpose, and so does the testing for __GFP_RETRY_MAYFAIL. This patch thus cleans up the function to test only !nr_reclaimed upfront, and remove the __GFP_RETRY_MAYFAIL test and nr_scanned parameter completely. Comment is also updated, explaining that approximating "full LRU list has been scanned" with nr_scanned == 0 didn't really work. Signed-off-by: Vlastimil Babka --- mm/vmscan.c | 43 ++++++++++++++----------------------------- 1 file changed, 14 insertions(+), 29 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index ad498b76e492..db3c9e06a888 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2582,7 +2582,6 @@ static bool in_reclaim_compaction(struct scan_control *sc) */ static inline bool should_continue_reclaim(struct pglist_data *pgdat, unsigned long nr_reclaimed, - unsigned long nr_scanned, struct scan_control *sc) { unsigned long pages_for_compaction; @@ -2593,28 +2592,18 @@ static inline bool should_continue_reclaim(struct pglist_data *pgdat, if (!in_reclaim_compaction(sc)) return false; - /* Consider stopping depending on scan and reclaim activity */ - if (sc->gfp_mask & __GFP_RETRY_MAYFAIL) { - /* - * For __GFP_RETRY_MAYFAIL allocations, stop reclaiming if the - * full LRU list has been scanned and we are still failing - * to reclaim pages. This full LRU scan is potentially - * expensive but a __GFP_RETRY_MAYFAIL caller really wants to succeed - */ - if (!nr_reclaimed && !nr_scanned) - return false; - } else { - /* - * For non-__GFP_RETRY_MAYFAIL allocations which can presumably - * fail without consequence, stop if we failed to reclaim - * any pages from the last SWAP_CLUSTER_MAX number of - * pages that were scanned. This will return to the - * caller faster at the risk reclaim/compaction and - * the resulting allocation attempt fails - */ - if (!nr_reclaimed) - return false; - } + /* + * Stop if we failed to reclaim any pages from the last SWAP_CLUSTER_MAX + * number of pages that were scanned. This will return to the caller + * with the risk reclaim/compaction and the resulting allocation attempt + * fails. In the past we have tried harder for __GFP_RETRY_MAYFAIL + * allocations through requiring that the full LRU list has been scanned + * first, by assuming that zero delta of sc->nr_scanned means full LRU + * scan, but that approximation was wrong, and there were corner cases + * where always a non-zero amount of pages were scanned. + */ + if (!nr_reclaimed) + return false; /* If compaction would go ahead or the allocation would succeed, stop */ for (z = 0; z <= sc->reclaim_idx; z++) { @@ -2641,11 +2630,7 @@ static inline bool should_continue_reclaim(struct pglist_data *pgdat, if (get_nr_swap_pages() > 0) inactive_lru_pages += node_page_state(pgdat, NR_INACTIVE_ANON); - return inactive_lru_pages > pages_for_compaction && - /* - * avoid dryrun with plenty of inactive pages - */ - nr_scanned && nr_reclaimed; + return inactive_lru_pages > pages_for_compaction; } static bool pgdat_memcg_congested(pg_data_t *pgdat, struct mem_cgroup *memcg) @@ -2810,7 +2795,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc) wait_iff_congested(BLK_RW_ASYNC, HZ/10); } while (should_continue_reclaim(pgdat, sc->nr_reclaimed - nr_reclaimed, - sc->nr_scanned - nr_scanned, sc)); + sc)); /* * Kswapd gives up on balancing particular nodes after too -- 2.22.0