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 A99A1C7EE23 for ; Thu, 1 Jun 2023 06:36:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231750AbjFAGgB (ORCPT ); Thu, 1 Jun 2023 02:36:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49470 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231682AbjFAGf5 (ORCPT ); Thu, 1 Jun 2023 02:35:57 -0400 Received: from mail-pf1-x436.google.com (mail-pf1-x436.google.com [IPv6:2607:f8b0:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2C5F98 for ; Wed, 31 May 2023 23:35:56 -0700 (PDT) Received: by mail-pf1-x436.google.com with SMTP id d2e1a72fcca58-64d24136685so435423b3a.1 for ; Wed, 31 May 2023 23:35:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shopee.com; s=shopee.com; t=1685601356; x=1688193356; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=n2GsxwgwUEfdpBblJK65XRtMqtTO1KwkNNcF5ULWqv0=; b=UZr+uxSUntQeNPbeNZbmzl34Y+FnDg4DPXipdcXF4PcD90hfjjNzJ/6V7Vp9cYGipY 2W0ei1M6WvTloAQtU9yu8SZ69B7fxrjAw3+xeVYxd5sd0LRQu+gYfHBB58DcU9o+wgFU vev+QO7dYDXu6xG3q+ZuzcUx77CEPFtWX61CPzfGsF5TUa9W3dm2pH+Qy24MDzeeD9S5 ov/lWxDZPFVczrJ/JclgpmAzY1RDeu666qgYyOH8Fvk7D0t9PkSEab5u8/5vw5fsFCPR M+u49hPUaLofqYGBUgOdRrllA7qwcvw/xWiMN93jUJW0lguhrwdE29GxezX14R1YrAbW m9wQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685601356; x=1688193356; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=n2GsxwgwUEfdpBblJK65XRtMqtTO1KwkNNcF5ULWqv0=; b=gMDJ/zOX/yyaC2QyL/y1onWDj3f1C1wFECO03HCMk407iz02SSzIQN4XgyoC+vvhPc YIujzJ1oiNqS1VLl0M+gjvCnJGw3nhbfcioITja11kPPNtoc2blsMNgsSAvV+N3aKK+P abWbe//G2i4I/pprX49MmNYBHZPnP7DORgSb3NvSVDrN/qsLU/Oa7Gw6McOzwcZYrsM2 ZXXY2YB9ZKk0AOjIBe2WS24RqobFTxtwJ/OfzBccM/RLEVmOpRGv6oGKjxw+m7XzaRml DHuZ/I183sybPwn5EQmclC6tR5Ln1Wa0lPipeGY7CxCmSrlYOd5thEDEDbLIGP8vCRUm susg== X-Gm-Message-State: AC+VfDzXqAJ4zMwie//apQdI2al0QoiGnLXw7ReoWt+taMjLkHwCtAgz mIhQYA6fmcqUGD4LNCqhzEJkxQ== X-Google-Smtp-Source: ACHHUZ7IDWn4Cvtit1m6gAQx0PvKlwHOXdroztxTwv74kJze1S5PM7Odo3XGRTfbsZYT1Pctrk6OIw== X-Received: by 2002:a05:6a00:1f96:b0:64d:2a87:2596 with SMTP id bg22-20020a056a001f9600b0064d2a872596mr720870pfb.10.1685601356269; Wed, 31 May 2023 23:35:56 -0700 (PDT) Received: from ubuntu-hf2.default.svc.cluster.local ([101.127.248.173]) by smtp.gmail.com with ESMTPSA id x25-20020a62fb19000000b0062e0c39977csm4302233pfm.139.2023.05.31.23.35.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 May 2023 23:35:56 -0700 (PDT) From: Haifeng Xu To: rppt@kernel.org Cc: mhocko@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Haifeng Xu Subject: [PATCH 2/2] mm/mm_init.c: do not calculate memmap and reserved pages for empty zone Date: Thu, 1 Jun 2023 06:35:36 +0000 Message-Id: <20230601063536.26882-2-haifeng.xu@shopee.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For empty zone, it's unnecessary to account for pages used by memmap. Also, the pages reserved in dma zone can be ignored. Signed-off-by: Haifeng Xu --- mm/mm_init.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/mm/mm_init.c b/mm/mm_init.c index 232efac9a929..b82718d596c3 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1543,6 +1543,13 @@ static void __init free_area_init_core(struct pglist_data *pgdat) size = zone->spanned_pages; freesize = zone->present_pages; + if (!size) { + nr_kernel_pages += 0; + nr_all_pages += 0; + zone_init_internals(zone, j, nid, 0); + continue; + } + /* * Adjust freesize so that it accounts for how much memory * is used by this zone for memmap. This affects the watermark @@ -1579,10 +1586,6 @@ static void __init free_area_init_core(struct pglist_data *pgdat) * And all highmem pages will be managed by the buddy system. */ zone_init_internals(zone, j, nid, freesize); - - if (!size) - continue; - setup_usemap(zone); init_currently_empty_zone(zone, zone->zone_start_pfn, size); } -- 2.25.1