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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 F2D81C433E2 for ; Wed, 16 Sep 2020 00:42:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ACE8E20770 for ; Wed, 16 Sep 2020 00:42:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bytedance-com.20150623.gappssmtp.com header.i=@bytedance-com.20150623.gappssmtp.com header.b="cXXnrjbp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726136AbgIPAmD (ORCPT ); Tue, 15 Sep 2020 20:42:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726595AbgIONDG (ORCPT ); Tue, 15 Sep 2020 09:03:06 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7AE4DC061354 for ; Tue, 15 Sep 2020 06:03:06 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id q4so1732594pjh.5 for ; Tue, 15 Sep 2020 06:03:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=X4BTtwaMtESewFNIOUy9zxHCLZirXUfq3fAtH3OWyA0=; b=cXXnrjbpWvONeQdtoAVhTZ1yEdWmSsnQjcHBSITYlGXfagXm3/IJgmyXBhneJ6FD7e RBdUN/kDepP9jC/FvRXoRJtKV3yp8pN7OHM1DHiC4YycfS5R5tW7UQm46HQw2bzjYntD ydYttZbIUk7Y7cp0efMhEeVtwpXC92brqjYiP6AsfeIp0gaHFUffOPUnYz1GAumIXGSt BqXqqefdlV3KyEVSMUu6lo2Y6hLkS6u9lNFi0Mok1IDjXxCUQse9upWTGu7yG/jDHyId juUbZp+JFrctB+XeE//2fQvtkKjeKle6+2zAKMxjOU6dksJTwyX1FTXYl3FgMtS6eHA+ T3UQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=X4BTtwaMtESewFNIOUy9zxHCLZirXUfq3fAtH3OWyA0=; b=SVMZR9q8wGVNs1sl0u4ObxTSLRg+hdYFLFG5NwQ6Fauq3UF+iQ583OPHSADOZ/NGoz kEx50MmqHPcDoelQ4Nkn1OHIlU91fNW2rS0vyqvDr6M3aDBAM9FC2CoAZ/TwVOuwVVH+ FMQKkgK3goBuuUu/iVZe+D7M9pywosKVuoKMZpA19dC1EiOKxU2u6erb+vocLH+fUC8h s6iBsH8hK22GsaF3lyVgH7Az4QhUdVslrRQu6XNpYR8m70KO3NkBj0Ya2ZJFh+dASUrx UGXSvFC6nAZzUWQPkD6cFg8RF2m4i+hRrSenB+z7Ztv8Q4CQl/Fe3b7JAQnM88H+Y6gG SbtQ== X-Gm-Message-State: AOAM532V+Qc4lI1qLWbHO/xIYX/XzgAY3hcmYz229eRqQq0BkN611k4k gP4nrxhOMdWTzXGB7Zv91Gw6iw== X-Google-Smtp-Source: ABdhPJzutEEVq5G6/7+ccPxCWjUDCELLq9lbv2LK9MvrA+j214YRs9JOfhtSh5/VK8gk1Qc8NYMz+A== X-Received: by 2002:a17:90b:3c3:: with SMTP id go3mr4345809pjb.64.1600174986059; Tue, 15 Sep 2020 06:03:06 -0700 (PDT) Received: from localhost.bytedance.net ([103.136.220.66]) by smtp.gmail.com with ESMTPSA id w185sm14269855pfc.36.2020.09.15.06.02.55 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 15 Sep 2020 06:03:05 -0700 (PDT) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [RFC PATCH 18/24] mm/hugetlb: Clear PageHWPoison on the non-error memory page Date: Tue, 15 Sep 2020 20:59:41 +0800 Message-Id: <20200915125947.26204-19-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20200915125947.26204-1-songmuchun@bytedance.com> References: <20200915125947.26204-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Because we reuse the first tail page, if we set PageHWPosion on a tail page. It indicates that we may set PageHWPoison on a series of pages. So we need to clear PageHWPoison on the non-error pages. We use the head[3].mapping to record the real error page index and clear non-error page PageHWPoison later. Signed-off-by: Muchun Song --- mm/hugetlb.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 34706cec21ec..8666cedf9a7b 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1847,6 +1847,21 @@ static inline void free_gigantic_page_comm(struct hstate *h, struct page *page) { free_gigantic_page(page, huge_page_order(h)); } + +static inline bool subpage_hwpoison(struct page *head, struct page *page) +{ + return page_private(head + 4) == page - head; +} + +static inline void set_subpage_hwpoison(struct page *head, struct page *page) +{ + set_page_private(head + 4, page - head); +} + +static inline void clear_subpage_hwpoison(struct page *head) +{ + set_page_private(head + 4, 0); +} #else static inline void hugetlb_vmemmap_init(struct hstate *h) { @@ -1894,6 +1909,19 @@ static inline void free_gigantic_page_comm(struct hstate *h, struct page *page) free_gigantic_page(page, huge_page_order(h)); spin_lock(&hugetlb_lock); } + +static inline bool subpage_hwpoison(struct page *head, struct page *page) +{ + return true; +} + +static inline void set_subpage_hwpoison(struct page *head, struct page *page) +{ +} + +static inline void clear_subpage_hwpoison(struct page *head) +{ +} #endif static void update_and_free_page(struct hstate *h, struct page *page) @@ -1918,6 +1946,9 @@ static void __free_hugepage(struct hstate *h, struct page *page) 1 << PG_referenced | 1 << PG_dirty | 1 << PG_active | 1 << PG_private | 1 << PG_writeback); + + if (PageHWPoison(page + i) && !subpage_hwpoison(page, page + i)) + ClearPageHWPoison(page + i); } VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page); VM_BUG_ON_PAGE(hugetlb_cgroup_from_page_rsvd(page), page); @@ -2107,6 +2138,7 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) free_huge_page_vmemmap(h, page); /* Must be called before the initialization of @page->lru */ vmemmap_pgtable_free(h, page); + clear_subpage_hwpoison(page); INIT_LIST_HEAD(&page->lru); set_compound_page_dtor(page, HUGETLB_PAGE_DTOR); @@ -2477,6 +2509,7 @@ int dissolve_free_huge_page(struct page *page) SetPageHWPoison(page); ClearPageHWPoison(head); } + set_subpage_hwpoison(head, page); list_del(&head->lru); h->free_huge_pages--; h->free_huge_pages_node[nid]--; -- 2.20.1