From patchwork Thu Oct 17 14:21:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 11196171 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D070913BD for ; Thu, 17 Oct 2019 14:21:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A773221D7F for ; Thu, 17 Oct 2019 14:21:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A773221D7F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E7B948E0003; Thu, 17 Oct 2019 10:21:34 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id E06D58E0008; Thu, 17 Oct 2019 10:21:34 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CF4348E0003; Thu, 17 Oct 2019 10:21:34 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0124.hostedemail.com [216.40.44.124]) by kanga.kvack.org (Postfix) with ESMTP id B08F08E0008 for ; Thu, 17 Oct 2019 10:21:34 -0400 (EDT) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 573E08207543 for ; Thu, 17 Oct 2019 14:21:34 +0000 (UTC) X-FDA: 76053489708.29.soap85_daf1a0f8c615 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,osalvador@suse.de,:n-horiguchi@ah.jp.nec.com:mhocko@kernel.org:mike.kravetz@oracle.com::linux-kernel@vger.kernel.org:osalvador@suse.de,RULES_HIT:30003:30054:30070:30091,0,RBL:195.135.220.15:@suse.de:.lbl8.mailshell.net-62.2.6.2 64.100.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:suse.de-dnsbl7.mailshell.net-127.0.0.120,Custom_rules:0:1:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: soap85_daf1a0f8c615 X-Filterd-Recvd-Size: 2971 Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by imf17.hostedemail.com (Postfix) with ESMTP for ; Thu, 17 Oct 2019 14:21:33 +0000 (UTC) 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 A74EBB488; Thu, 17 Oct 2019 14:21:32 +0000 (UTC) From: Oscar Salvador To: n-horiguchi@ah.jp.nec.com Cc: mhocko@kernel.org, mike.kravetz@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Oscar Salvador Subject: [RFC PATCH v2 02/16] mm,madvise: call soft_offline_page() without MF_COUNT_INCREASED Date: Thu, 17 Oct 2019 16:21:09 +0200 Message-Id: <20191017142123.24245-3-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20191017142123.24245-1-osalvador@suse.de> References: <20191017142123.24245-1-osalvador@suse.de> 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: From: Naoya Horiguchi The call to get_user_pages_fast is only to get the pointer to a struct page of a given address, pinning it is memory-poisoning handler's job, so drop the refcount grabbed by get_user_pages_fast Signed-off-by: Naoya Horiguchi Signed-off-by: Oscar Salvador --- mm/madvise.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/mm/madvise.c b/mm/madvise.c index 2be9f3fdb05e..89ed9a22ff4f 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -878,16 +878,24 @@ static int madvise_inject_error(int behavior, */ order = compound_order(compound_head(page)); - if (PageHWPoison(page)) { - put_page(page); + /* + * The get_user_pages_fast() is just to get the pfn of the + * given address, and the refcount has nothing to do with + * what we try to test, so it should be released immediately. + * This is racy but it's intended because the real hardware + * errors could happen at any moment and memory error handlers + * must properly handle the race. + */ + put_page(page); + + if (PageHWPoison(page)) continue; - } if (behavior == MADV_SOFT_OFFLINE) { pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n", pfn, start); - ret = soft_offline_page(page, MF_COUNT_INCREASED); + ret = soft_offline_page(page, 0); if (ret) return ret; continue; @@ -895,14 +903,6 @@ static int madvise_inject_error(int behavior, pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n", pfn, start); - - /* - * Drop the page reference taken by get_user_pages_fast(). In - * the absence of MF_COUNT_INCREASED the memory_failure() - * routine is responsible for pinning the page to prevent it - * from being released back to the page allocator. - */ - put_page(page); ret = memory_failure(pfn, 0); if (ret) return ret;