From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f71.google.com (mail-oi0-f71.google.com [209.85.218.71]) by kanga.kvack.org (Postfix) with ESMTP id 6F9216B0038 for ; Fri, 30 Sep 2016 05:30:27 -0400 (EDT) Received: by mail-oi0-f71.google.com with SMTP id l187so50976733oia.0 for ; Fri, 30 Sep 2016 02:30:27 -0700 (PDT) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com. [58.251.152.64]) by mx.google.com with ESMTPS id i40si12937074otd.114.2016.09.30.02.30.21 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 30 Sep 2016 02:30:22 -0700 (PDT) From: Yisheng Xie Subject: [PATCH v4 0/2] arm64/hugetlb: enable gigantic page Date: Fri, 30 Sep 2016 17:26:07 +0800 Message-ID: <1475227569-63446-1-git-send-email-xieyisheng1@huawei.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, mhocko@kernel.org Cc: guohanjun@huawei.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, will.deacon@arm.com, dave.hansen@intel.com, sudeep.holla@arm.com, catalin.marinas@arm.com, mark.rutland@arm.com, robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org, mike.kravetz@oracle.com, n-horiguchi@ah.jp.nec.com changelog ========= v3->v4: add changelog in the cover leter to make the change history more clear. v2->v3: change the Kconfig file to avoid comile warning when select ARCH_HAS_GIGANTIC_PAGE with !CONFIG_HUGETLB_PAGE v1->v2: introduce the ARCH_HAS_GIGANTIC_PAGE as Michal Hocko suggested Arm64 supports different size of gigantic page which can be seen from: commit 084bd29810a5 ("ARM64: mm: HugeTLB support.") commit 66b3923a1a0f ("arm64: hugetlb: add support for PTE contiguous bit") So I tried to use this function by adding hugepagesz=1G in kernel parameters, with CONFIG_CMA=y. However, when I echo xx > \ /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages it failed with the following info: -bash: echo: write error: Invalid argument This is a v4 patchset which make gigantic page can be allocated and freed at runtime for arch arm64, with CONFIG_CMA=y or other related configs is enabled. You can see the former discussions at: https://lkml.org/lkml/2016/8/18/310 https://lkml.org/lkml/2016/8/21/410 https://lkml.org/lkml/2016/8/22/319 Yisheng Xie (2): mm/hugetlb: Introduce ARCH_HAS_GIGANTIC_PAGE arm64 Kconfig: Select gigantic page arch/arm64/Kconfig | 1 + arch/s390/Kconfig | 1 + arch/x86/Kconfig | 1 + fs/Kconfig | 3 +++ mm/hugetlb.c | 2 +- 5 files changed, 7 insertions(+), 1 deletion(-) -- 1.7.12.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org