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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 2FA3AC64E8A for ; Mon, 30 Nov 2020 15:22:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9CA220719 for ; Mon, 30 Nov 2020 15:22:15 +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="LwCkA5hr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727387AbgK3PWK (ORCPT ); Mon, 30 Nov 2020 10:22:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728082AbgK3PWJ (ORCPT ); Mon, 30 Nov 2020 10:22:09 -0500 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFBC2C061A4A for ; Mon, 30 Nov 2020 07:21:23 -0800 (PST) Received: by mail-pj1-x1044.google.com with SMTP id j13so1564489pjz.3 for ; Mon, 30 Nov 2020 07:21:23 -0800 (PST) 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=YYT5dZtYNzoNgBDfI70BMw/hObfhoANnOlo7wxpDnOM=; b=LwCkA5hrD1gS48cmMaDT4qNjkGb6QdEv5brr1re2aHgG+6vLIkxIOY0LXKteJIDKn5 oZD7pJeys1ZiAV5Oco/N6zt5O24MHWQm1ONrkg/tWXj9Y+VFcP4eOmMmKaSvOnJ7g0k4 74Z2xr9Sv/YIpgMg+hOKcpsvL3ZmX38JB6WrqJ53wfLVojj4Q/q8Ncs8kEdQmYaTf8st UszQjA7JU6se5KTtNhGZXFbuMjeGaiUBI+n9V/9+rn9Xs0tooZ3DqkiUh9AkHkjBh7XY bsYgwedmNvzFgI7KACSo4vfq9wbH8Iw5IMDXOGX/2Pb06fHj10wKqyGQmu2/wpe83kUF CcDw== 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=YYT5dZtYNzoNgBDfI70BMw/hObfhoANnOlo7wxpDnOM=; b=U71H+dVVo90Zed+YgUe9XXCO1Nu1tkpbrwd1SZowaOQJgTsvjA6SnYe29dvj8Msm5a Qy2QZZAYXcQppT+qeDQx91hc5/9KaM0jKezWXx7aQ4ttfMtJJ4GPVvLlXv5JsWl86xjb wPVsYDH+tFPf3xQTFlQyxf5MmEi8pFzvOuUiDtx8yeWk5qpKebopvG+GfaJEveXPkqTS PYeTMdWw068kDfl3uA8o8+prIXpta3h80ty0E5vdZkn5V0QeJEKiZU7f/hb6nDOGTbGu mPzKG2AfrL0bm4pR3ISUfZxXBjcmfZEgl1mKNpcNYz9h/iVPmXKECvsbB4Qh+bBBpy9v wPuw== X-Gm-Message-State: AOAM533KkKt59dZF7UUhuwIanI/UoobwknDt/GJoZSUn0eA40FFbjL7f dW/lHi0eoG6lv2o119xcesPFbw== X-Google-Smtp-Source: ABdhPJzdJo9xFB6qdz9EJXty4ReNm/tlcxVwZxpF9t/uXenCEP4+6bpzwvCYL7obLU7Z+UpQ5teEuA== X-Received: by 2002:a17:90b:3907:: with SMTP id ob7mr27218790pjb.70.1606749683381; Mon, 30 Nov 2020 07:21:23 -0800 (PST) Received: from localhost.bytedance.net ([103.136.221.68]) by smtp.gmail.com with ESMTPSA id q12sm16201660pgv.91.2020.11.30.07.21.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Nov 2020 07:21:22 -0800 (PST) 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, willy@infradead.org, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [PATCH v7 12/15] mm/hugetlb: Flush work when dissolving hugetlb page Date: Mon, 30 Nov 2020 23:18:35 +0800 Message-Id: <20201130151838.11208-13-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201130151838.11208-1-songmuchun@bytedance.com> References: <20201130151838.11208-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We should flush work when dissolving a hugetlb page to make sure that the hugetlb page is freed to the buddy. Signed-off-by: Muchun Song --- mm/hugetlb.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 12cb46b8e901..a114d6bfd1b9 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1327,6 +1327,12 @@ static void update_hpage_vmemmap_workfn(struct work_struct *work) } static DECLARE_WORK(hpage_update_work, update_hpage_vmemmap_workfn); +static inline void flush_hpage_update_work(struct hstate *h) +{ + if (free_vmemmap_pages_per_hpage(h)) + flush_work(&hpage_update_work); +} + static inline void __update_and_free_page(struct hstate *h, struct page *page) { /* No need to allocate vmemmap pages */ @@ -1833,6 +1839,7 @@ static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed, int dissolve_free_huge_page(struct page *page) { int rc = -EBUSY; + struct hstate *h = NULL; /* Not to disrupt normal path by vainly holding hugetlb_lock */ if (!PageHuge(page)) @@ -1846,8 +1853,9 @@ int dissolve_free_huge_page(struct page *page) if (!page_count(page)) { struct page *head = compound_head(page); - struct hstate *h = page_hstate(head); int nid = page_to_nid(head); + + h = page_hstate(head); if (h->free_huge_pages - h->resv_huge_pages == 0) goto out; @@ -1861,6 +1869,14 @@ int dissolve_free_huge_page(struct page *page) } out: spin_unlock(&hugetlb_lock); + + /* + * We should flush work before return to make sure that + * the HugeTLB page is freed to the buddy. + */ + if (!rc && h) + flush_hpage_update_work(h); + return rc; } -- 2.11.0