From patchwork Thu Oct 17 14:21:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 11196195 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 1C06714ED for ; Thu, 17 Oct 2019 14:22:00 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E02BF21D7C for ; Thu, 17 Oct 2019 14:21:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E02BF21D7C 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 842288E000B; Thu, 17 Oct 2019 10:21:39 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 6E5B38E0016; Thu, 17 Oct 2019 10:21:39 -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 444ED8E0015; Thu, 17 Oct 2019 10:21:39 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0028.hostedemail.com [216.40.44.28]) by kanga.kvack.org (Postfix) with ESMTP id 1300A8E0014 for ; Thu, 17 Oct 2019 10:21:39 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 7896B5848 for ; Thu, 17 Oct 2019 14:21:38 +0000 (UTC) X-FDA: 76053489876.10.run64_e31c0273415b 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:30054:30070,0,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:0:0:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: run64_e31c0273415b X-Filterd-Recvd-Size: 5076 Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by imf35.hostedemail.com (Postfix) with ESMTP for ; Thu, 17 Oct 2019 14:21:37 +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 11D7DB4EE; Thu, 17 Oct 2019 14:21:36 +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 10/16] mm,hwpoison: Rework soft offline for free pages Date: Thu, 17 Oct 2019 16:21:17 +0200 Message-Id: <20191017142123.24245-11-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: When trying to soft-offline a free page, we need to first take it off the buddy allocator. Once we know is out of reach, we can safely flag it as poisoned. take_page_off_buddy will be used to take a page meant to be poisoned off the buddy allocator. take_page_off_buddy calls break_down_buddy_pages, which splits a higher-order page in case our page belongs to one. Once the page is under our control, we call page_set_poison to set it as poisoned and grab a refcount on it. Signed-off-by: Oscar Salvador --- mm/memory-failure.c | 20 +++++++++++----- mm/page_alloc.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 82 insertions(+), 6 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 37b230b8cfe7..1d986580522d 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -78,6 +78,15 @@ EXPORT_SYMBOL_GPL(hwpoison_filter_dev_minor); EXPORT_SYMBOL_GPL(hwpoison_filter_flags_mask); EXPORT_SYMBOL_GPL(hwpoison_filter_flags_value); +extern bool take_page_off_buddy(struct page *page); + +static void page_handle_poison(struct page *page) +{ + SetPageHWPoison(page); + page_ref_inc(page); + num_poisoned_pages_inc(); +} + static int hwpoison_filter_dev(struct page *p) { struct address_space *mapping; @@ -1830,14 +1839,13 @@ static int soft_offline_in_use_page(struct page *page) static int soft_offline_free_page(struct page *page) { - int rc = dissolve_free_huge_page(page); + int rc = -EBUSY; - if (!rc) { - if (set_hwpoison_free_buddy_page(page)) - num_poisoned_pages_inc(); - else - rc = -EBUSY; + if (!dissolve_free_huge_page(page) && take_page_off_buddy(page)) { + page_handle_poison(page); + rc = 0; } + return rc; } diff --git a/mm/page_alloc.c b/mm/page_alloc.c index cd1dd0712624..255df0c76a40 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8632,6 +8632,74 @@ bool is_free_buddy_page(struct page *page) #ifdef CONFIG_MEMORY_FAILURE /* + * Break down a higher-order page in sub-pages, and keep our target out of + * buddy allocator. + */ +static void break_down_buddy_pages(struct zone *zone, struct page *page, + struct page *target, int low, int high, + struct free_area *area, int migratetype) +{ + unsigned long size = 1 << high; + struct page *current_buddy, *next_page; + + while (high > low) { + area--; + high--; + size >>= 1; + + if (target >= &page[size]) { + next_page = page + size; + current_buddy = page; + } else { + next_page = page; + current_buddy = page + size; + } + + if (set_page_guard(zone, current_buddy, high, migratetype)) + continue; + + if (current_buddy != target) { + add_to_free_area(current_buddy, area, migratetype); + set_page_order(current_buddy, high); + page = next_page; + } + } +} + +/* + * Take a page that will be marked as poisoned off the buddy allocator. + */ +bool take_page_off_buddy(struct page *page) + { + struct zone *zone = page_zone(page); + unsigned long pfn = page_to_pfn(page); + unsigned long flags; + unsigned int order; + bool ret = false; + + spin_lock_irqsave(&zone->lock, flags); + for (order = 0; order < MAX_ORDER; order++) { + struct page *page_head = page - (pfn & ((1 << order) - 1)); + int buddy_order = page_order(page_head); + struct free_area *area = &(zone->free_area[buddy_order]); + + if (PageBuddy(page_head) && buddy_order >= order) { + unsigned long pfn_head = page_to_pfn(page_head); + int migratetype = get_pfnblock_migratetype(page_head, + pfn_head); + + del_page_from_free_area(page_head, area); + break_down_buddy_pages(zone, page_head, page, 0, + buddy_order, area, migratetype); + ret = true; + break; + } + } + spin_unlock_irqrestore(&zone->lock, flags); + return ret; + } + +/* * Set PG_hwpoison flag if a given page is confirmed to be a free page. This * test is performed under the zone lock to prevent a race against page * allocation.