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 BEAEDC433EF for ; Thu, 31 Mar 2022 06:57:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231575AbiCaG7T (ORCPT ); Thu, 31 Mar 2022 02:59:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43018 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230158AbiCaG7P (ORCPT ); Thu, 31 Mar 2022 02:59:15 -0400 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F12AC108547 for ; Wed, 30 Mar 2022 23:57:27 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id bx5so23159760pjb.3 for ; Wed, 30 Mar 2022 23:57:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=I5exx/RB+d0Ig7pXuqKbMzRv7rQoprfE6EMWAxPn3vk=; b=VxsWEIotkC2VYiWWzOCyD1h39EI03hJn4gYoUq5zL+es6eKEi/fQPJEpTFiQhX51V9 eikNF5Q4nJX9kTCRRilvUSCkBYeRXTclsDYJrtTV3K7xEbiRG2R9cRz5ththfznMM3XC 66QKDnh3Cj3JDimXFfT7EUKNWhHjsObnnQynBYRDAdMdFdKt8UOEDbHAWZejxE0xs4rx snTFc7AtACXs3vBUkU+J5RON6gZUTOjKnm6p9ZnUqRBfbWaVAiLtTSaP8GfA32r9OqOS f7tm7oIJpihmrGFTzDO6n6HNvqTowM06YPD5GLVOL5OO1WiLcWlYeA+WAx20Xiu72BDc B/jw== 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:mime-version :content-transfer-encoding; bh=I5exx/RB+d0Ig7pXuqKbMzRv7rQoprfE6EMWAxPn3vk=; b=jhyDjfeBK6xfFuMXPFnhWSn7R8Lmt5XEqOzcArNqKhYCmkP87y9Zo/ujcNKIyLo3Io 5z2EeQpDeBvjX/B1xAto1DvSc8zhKgjsX2tqh5GLmKknPTze8gEL7ZQH0v0weDc8LTCm oLvupIefcwqfw/A1aDiPC4P6pavKb4/BFLYkJ/fP9HHEwKK9sWnvDU0SlOoIJ7Vr/L5J 1OqKrCTPvfmhPl6d55aTrah+NeSbIYzy3os8Pu6qYNPHPS5gvT0c+mQa96O08a16z3v3 U+2xKKwl9d5lSvWcGQnEkrDAMqGiNZz5c+vEInmgWGIWPREvi1dmGLPPjNoLhPjidqbV eEvg== X-Gm-Message-State: AOAM533dGzURFgUBsq32iYMaCtV8+S5N0B1eahidriepK7J7/XGx6Dyj pYGHZwLrN8bDWB8E/FXBp0y2GA== X-Google-Smtp-Source: ABdhPJxVeMek9ygr1gEJ2F2+WMGJOZmPNv0PKkIoA3/xhuB910rYtwVdeKFiPVghs/O8sDNlYZOp5w== X-Received: by 2002:a17:90b:17c7:b0:1c7:c616:6eb0 with SMTP id me7-20020a17090b17c700b001c7c6166eb0mr4632866pjb.144.1648709847477; Wed, 30 Mar 2022 23:57:27 -0700 (PDT) Received: from FVFYT0MHHV2J.bytedance.net ([139.177.225.239]) by smtp.gmail.com with ESMTPSA id d8-20020a056a00198800b004fab740dbe6sm26169846pfl.15.2022.03.30.23.57.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Mar 2022 23:57:27 -0700 (PDT) From: Muchun Song To: will@kernel.org, akpm@linux-foundation.org, david@redhat.com, bodeddub@amazon.com, osalvador@suse.de, mike.kravetz@oracle.com, rientjes@google.com, mark.rutland@arm.com, catalin.marinas@arm.com, james.morse@arm.com, 21cnbao@gmail.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, duanxiongchun@bytedance.com, fam.zheng@bytedance.com, smuchun@gmail.com, Muchun Song Subject: [PATCH v4 1/2] mm: hugetlb_vmemmap: introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP Date: Thu, 31 Mar 2022 14:56:39 +0800 Message-Id: <20220331065640.5777-1-songmuchun@bytedance.com> X-Mailer: git-send-email 2.32.0 (Apple Git-132) MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The feature of minimizing overhead of struct page associated with each HugeTLB page is implemented on x86_64, however, the infrastructure of this feature is already there, we could easily enable it for other architectures. Introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP for other architectures to be easily enabled. Just select this config if they want to enable this feature. Suggested-by: Andrew Morton Signed-off-by: Muchun Song --- arch/x86/Kconfig | 1 + fs/Kconfig | 10 +++++++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 9f5bd41bf660..e69d42528542 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -119,6 +119,7 @@ config X86 select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_WANTS_NO_INSTR select ARCH_WANT_HUGE_PMD_SHARE + select ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP if X86_64 select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANTS_THP_SWAP if X86_64 select ARCH_HAS_PARANOID_L1D_FLUSH diff --git a/fs/Kconfig b/fs/Kconfig index 6c7dc1387beb..f6db2af33738 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,9 +245,17 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS +# +# Select this config option from the architecture Kconfig, if it is preferred +# to enable the feature of minimizing overhead of struct page associated with +# each HugeTLB page. +# +config ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP + bool + config HUGETLB_PAGE_FREE_VMEMMAP def_bool HUGETLB_PAGE - depends on X86_64 + depends on ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP depends on SPARSEMEM_VMEMMAP config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON -- 2.11.0