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 64FC8C64E75 for ; Fri, 20 Nov 2020 06:49:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B33F22256 for ; Fri, 20 Nov 2020 06:49:02 +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="oWDyzyq+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727076AbgKTGsr (ORCPT ); Fri, 20 Nov 2020 01:48:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727048AbgKTGsq (ORCPT ); Fri, 20 Nov 2020 01:48:46 -0500 Received: from mail-pf1-x441.google.com (mail-pf1-x441.google.com [IPv6:2607:f8b0:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2555EC0617A7 for ; Thu, 19 Nov 2020 22:48:45 -0800 (PST) Received: by mail-pf1-x441.google.com with SMTP id g7so6946087pfc.2 for ; Thu, 19 Nov 2020 22:48:45 -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=cH/Hq+5EQ/oi9mKzhIRZsbYyftv0OzxuKDhe9q6sjjU=; b=oWDyzyq+dmGpl9uNGNrMrsM6EXsNni7+X0imlQSsWu4R1nxGalcVhmbeoUlxgFYiA8 9Oy8mwvmKN2m4utS4QX/h/Gt4xfyYaHVOfrpU3wVsrh74EWb37tASIzHMGqCMR95HZr6 Gghyyb2TOGsOwFqD16ajMcQt71XhiHnPcpry55159JjoEXpeEpmQq9s2/VS4JfJ+FOM2 Dz5L2yie3tf8kPA8V93tIb/ZgFaVs/OXnh3je1kWzyjfgpxE0W9/eRgDYFRlL4lYFzWs kLBDAEvYUarT7qLPadNxBUQGXeCim/43gLgJEECnN3hSvGLIUF+mlAp+h4WPl9X+Lzra vSZw== 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=cH/Hq+5EQ/oi9mKzhIRZsbYyftv0OzxuKDhe9q6sjjU=; b=Oin+isLLgbVuNbZ9sTDQNFDcpe5xLyDI8rBZtqkWqxl26t5Ok8wENljckl3NJMaNxp vTNYtPOa5CeK3CpVAOCiDqKVdikzrRh0KdzCYTUZz8SzS8emgQYLuJ9yBeqese//IVrr J+tZ0Hox7bc2Kpp+DwVGmhdW2OC4NQntKLP1jSAMVWmYyIlUuDlS57P0M5h95Iq0x3JN AZj2tOCbwmuTsklz5PrlfOd93W6ZwNJQUs8tqnRFLKJNEGE8nGR/y0uxUcV7oQSWIhiU q12ncLSAYw2OODAfHlqFX0szIsS5JI5cLgQrXSlOpgcCaOgSJwpSMnr6TQu7DcLjpxJI yOOQ== X-Gm-Message-State: AOAM530UXm1ER7chJPFsahNYGrvvJxxoF+1FVZfEufi0gwEHjuUrlKdA X8QjtxXXVTBLk3S/4r5bqYSrew== X-Google-Smtp-Source: ABdhPJwDvG7GsuYtBL0kSSFWUAuwbp52LipL66IhZf9RaKJAS1nviAYWM5o/UWaxVi0myGODxMhyHg== X-Received: by 2002:a17:90a:a481:: with SMTP id z1mr1626175pjp.202.1605854924788; Thu, 19 Nov 2020 22:48:44 -0800 (PST) Received: from localhost.localdomain ([103.136.221.72]) by smtp.gmail.com with ESMTPSA id 23sm2220278pfx.210.2020.11.19.22.48.35 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 19 Nov 2020 22:48:44 -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 v5 16/21] mm/hugetlb: Flush work when dissolving hugetlb page Date: Fri, 20 Nov 2020 14:43:20 +0800 Message-Id: <20201120064325.34492-17-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201120064325.34492-1-songmuchun@bytedance.com> References: <20201120064325.34492-1-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 b853aacd5c16..9aad0b63d369 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1328,6 +1328,12 @@ 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 */ @@ -1928,6 +1934,7 @@ 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)) @@ -1941,8 +1948,9 @@ 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; @@ -1956,6 +1964,14 @@ 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