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=-0.8 required=3.0 tests=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 6909FC4740A for ; Sat, 5 Oct 2019 22:38:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0640D222C0 for ; Sat, 5 Oct 2019 22:38:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="rH94qsZQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0640D222C0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lca.pw Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 732976B0003; Sat, 5 Oct 2019 18:38:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6E2656B0005; Sat, 5 Oct 2019 18:38:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5D0B76B0006; Sat, 5 Oct 2019 18:38:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0090.hostedemail.com [216.40.44.90]) by kanga.kvack.org (Postfix) with ESMTP id 35F1A6B0003 for ; Sat, 5 Oct 2019 18:38:42 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id CA16F181AC9AE for ; Sat, 5 Oct 2019 22:38:41 +0000 (UTC) X-FDA: 76011196842.22.coil89_11a5c6b6a1a3b X-HE-Tag: coil89_11a5c6b6a1a3b X-Filterd-Recvd-Size: 3900 Received: from mail-qk1-f193.google.com (mail-qk1-f193.google.com [209.85.222.193]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Sat, 5 Oct 2019 22:38:41 +0000 (UTC) Received: by mail-qk1-f193.google.com with SMTP id x134so9283766qkb.0 for ; Sat, 05 Oct 2019 15:38:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=fHN77US4+VYq3DlO+1Rmg/MJTyEQKAjNoh7mf3T2cr8=; b=rH94qsZQ1zUlNvtB46B4Q/FapNdweQcvPLUIUVKG6PieN2mezMQyrlzf5a/xSCXTwm fuW+IzkO0srB5ezJHaBce8IpOf0tZbbhCE1ow+09DD6Emqt4R3D4F0m7Xx3ZkmGjktGE JBekY0SCekOGe+IVa6bLLxbOcHYarUsjHpwil+EIF8pCPazDT+QjP/9EJ9O3mvgZMnbY dpkNql9D/09g3+oozWMzGg26DOLVxrb+qnablc1YbP+MWmo4UHVcvO2EIMOXYOqWhxN9 HLj35qQ+AswkImVEfC5Hjmc8KevHEK5ZATy+6Xt0eIwH3qa0ChqmgYxD4HxtwqWZl/Km X+YA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=fHN77US4+VYq3DlO+1Rmg/MJTyEQKAjNoh7mf3T2cr8=; b=K36JdGCNULOfUf6/tBm5kGKq61lFHv4Rf/yaqUJnP1hY59k9bpiGOzrW8fG1PamSQN bq69toIQtPAclbDTHVH8HY4yh87s1nro5mxj9lN6lm5gMixUlQbZtAid5ASJgY1WxEJB kgcZdC2wzQhhtdkAuh0C3e2/l3sH3ChddG6wvaHqD2HzvlITbGYdPOR1UG4/Kelr75Zo VvU3xdSKkPFbu9ZjAjE9+am/7aqOj1QqD9YDoyoA16iiju3kWpgnapyy1iZKPd5cO2nz SWlUEPWzsM/+rVVUObvBKxqQtmYToKOLlmO83XQTjbmcHUHDGJZxmypdQZyPC6zSH8h+ Dd3Q== X-Gm-Message-State: APjAAAVjsywuPUCaCXexgckE8Yvma9WZm+vymzBc4rkg/QD0Dqdi4iI3 8D8I1fkFev5DHN6fZIwr2RMg2w== X-Google-Smtp-Source: APXvYqzz2qz3pmvZKX5r7Jp8zE9/AhVJ0z3Kfw2ReOkZyC4Bw/NXIPhxwy5QRdt+d3Y8rxnbouSsLQ== X-Received: by 2002:a37:a946:: with SMTP id s67mr17630319qke.470.1570315120427; Sat, 05 Oct 2019 15:38:40 -0700 (PDT) Received: from [192.168.1.183] (pool-71-184-117-43.bstnma.fios.verizon.net. [71.184.117.43]) by smtp.gmail.com with ESMTPSA id 199sm5505955qkk.112.2019.10.05.15.38.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 05 Oct 2019 15:38:39 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH] mm/page_alloc: Add a reason for reserved pages in has_unmovable_pages() Date: Sat, 5 Oct 2019 18:38:38 -0400 Message-Id: <615D1FE9-C16A-4FD5-A113-1C50AB3F0222@lca.pw> References: <20191005142232.e08976cf8905824fad0533ff@linux-foundation.org> Cc: Michal Hocko , Anshuman Khandual , linux-mm@kvack.org, Vlastimil Babka , Oscar Salvador , Mel Gorman , Mike Rapoport , Dan Williams , Pavel Tatashin , linux-kernel@vger.kernel.org In-Reply-To: <20191005142232.e08976cf8905824fad0533ff@linux-foundation.org> To: Andrew Morton X-Mailer: iPhone Mail (17A860) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000081, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Oct 5, 2019, at 5:22 PM, Andrew Morton wrot= e: >=20 > Apparently some console drivers can do memory allocation on the printk() > path. >=20 > This behavior is daft, IMO. Have we identified which ones and looked > into fixing them? Not necessary that simple. It is more of 2+ CPUs required to trigger the dea= dlock. Please see my v2 patch I sent which has all the information. Especial= ly, the thread link included there which contains a few lockdep splat traces= and the s390 one in the patch description.=