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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 899DEC433FE for ; Mon, 4 Apr 2022 21:38:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383588AbiDDVdp (ORCPT ); Mon, 4 Apr 2022 17:33:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1380406AbiDDUFC (ORCPT ); Mon, 4 Apr 2022 16:05:02 -0400 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A3A430576; Mon, 4 Apr 2022 13:03:06 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id o20so3309569pla.13; Mon, 04 Apr 2022 13:03:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pjgpRMK0NYimSGrt6nJpOa6PTGJdKr7+fAKLKjoWSDA=; b=IECkqfJQKLLWFdbYM3okONxP8OCi2B/qhAroDXHSWfm5bYnfJL/3ruGjY7jjefY0Gl L5WjDq/N9jwBTvcrJCsT4J0fzr2xjvuh8bWlexy6BVuINn3TpgJJBr3tFnwRqKaSbXQk UYJi5I759jd55kj8vaDvPYhYuuRuxJrwRLhlVhmuNcZgQQxWNw03wVSIYlfZopIore1n Tt8mE/Gd9OPxT4FZm62VVyFVklJsp0cXJdXN7OoL2bdskeBCGMfODwfLgV3uYuYcubAa Q/M/j+t5uN2t9sdXHQticavAavTRY2vjlqVVwxtzg9HpDw8PcXGrXbh7M9fdlwtfra5I AU1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pjgpRMK0NYimSGrt6nJpOa6PTGJdKr7+fAKLKjoWSDA=; b=qakfGMyHe1n3bm/gekWuFWEXJvYp8lZthgoKFlqSCLHzUZgZaU9b3FdBcDdyimQqOp hhEdTzrAn7f8EaKeUhccFiDlTvcTjWucREi34xDt5lQCe21FLfthS0x6DPVsVzRlHXnL rwwRnvE6VnhYtFGVc3uZG3o7B1c2KK4ZGTIK1FJOnXumbQNSi2vNwGajuPdsE7CoqFJG +9413gOWf2a0AhrCQ+iMe1LXiLTYnukjKgNrCYf+VNsmRqE2WXw2ww8duwxGXjUnozk0 ckBEi2A0Om7xhwk5dsnWJWv+KKqbeHg9e44zSSgc7yYWJTqPpKzVuvbJlGpt6UDs37tt JzVQ== X-Gm-Message-State: AOAM5324Cl7jjK2bIPfh/zaLjzfJt62oL04ZpcVW6jq4PGZYy28ekpfO 6wPsYEU7c1N1tYnw5/WAa0SLW7loiOY= X-Google-Smtp-Source: ABdhPJwmqyYOoY4I6R15zAUVTjRG2/sPdiZ1ExIttI9HW/6wIEkHQfrDPIEksQO0dehGXzHTVVqHfA== X-Received: by 2002:a17:90b:1b4f:b0:1c6:d91b:9d0 with SMTP id nv15-20020a17090b1b4f00b001c6d91b09d0mr920843pjb.72.1649102585569; Mon, 04 Apr 2022 13:03:05 -0700 (PDT) Received: from localhost.localdomain (c-67-174-241-145.hsd1.ca.comcast.net. [67.174.241.145]) by smtp.gmail.com with ESMTPSA id bw17-20020a056a00409100b004fadad3b93esm12779295pfb.142.2022.04.04.13.03.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Apr 2022 13:03:05 -0700 (PDT) From: Yang Shi To: vbabka@suse.cz, kirill.shutemov@linux.intel.com, linmiaohe@huawei.com, songliubraving@fb.com, riel@surriel.com, willy@infradead.org, ziy@nvidia.com, tytso@mit.edu, akpm@linux-foundation.org Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [v3 PATCH 2/8] mm: khugepaged: remove redundant check for VM_NO_KHUGEPAGED Date: Mon, 4 Apr 2022 13:02:44 -0700 Message-Id: <20220404200250.321455-3-shy828301@gmail.com> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20220404200250.321455-1-shy828301@gmail.com> References: <20220404200250.321455-1-shy828301@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The hugepage_vma_check() called by khugepaged_enter_vma_merge() does check VM_NO_KHUGEPAGED. Remove the check from caller and move the check in hugepage_vma_check() up. More checks may be run for VM_NO_KHUGEPAGED vmas, but MADV_HUGEPAGE is definitely not a hot path, so cleaner code does outweigh. Reviewed-by: Miaohe Lin Acked-by: Song Liu Signed-off-by: Yang Shi --- mm/khugepaged.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a4e5eaf3eb01..7d197d9e3258 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -365,8 +365,7 @@ int hugepage_madvise(struct vm_area_struct *vma, * register it here without waiting a page fault that * may not happen any time soon. */ - if (!(*vm_flags & VM_NO_KHUGEPAGED) && - khugepaged_enter_vma_merge(vma, *vm_flags)) + if (khugepaged_enter_vma_merge(vma, *vm_flags)) return -ENOMEM; break; case MADV_NOHUGEPAGE: @@ -445,6 +444,9 @@ static bool hugepage_vma_check(struct vm_area_struct *vma, if (!transhuge_vma_enabled(vma, vm_flags)) return false; + if (vm_flags & VM_NO_KHUGEPAGED) + return false; + if (vma->vm_file && !IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff, HPAGE_PMD_NR)) return false; @@ -470,7 +472,8 @@ static bool hugepage_vma_check(struct vm_area_struct *vma, return false; if (vma_is_temporary_stack(vma)) return false; - return !(vm_flags & VM_NO_KHUGEPAGED); + + return true; } int __khugepaged_enter(struct mm_struct *mm) -- 2.26.3