From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f71.google.com (mail-it0-f71.google.com [209.85.214.71]) by kanga.kvack.org (Postfix) with ESMTP id 723A76B0260 for ; Mon, 22 Aug 2016 09:25:14 -0400 (EDT) Received: by mail-it0-f71.google.com with SMTP id i64so152144690ith.0 for ; Mon, 22 Aug 2016 06:25:14 -0700 (PDT) Received: from szxga03-in.huawei.com (szxga03-in.huawei.com. [119.145.14.66]) by mx.google.com with ESMTPS id c204si10470960oig.78.2016.08.22.06.24.34 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 22 Aug 2016 06:25:13 -0700 (PDT) From: Xie Yisheng Subject: [RFC PATCH v3 0/2] arm64/hugetlb: enable gigantic page Date: Mon, 22 Aug 2016 21:20:02 +0800 Message-ID: <1471872004-59365-1-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, mhocko@suse.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 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 v3 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 Xie Yisheng (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