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Date: Fri, 30 Sep 2016 17:26:07 +0800 From: Yisheng Xie <xieyisheng1@...wei.com> To: <akpm@...ux-foundation.org>, <mhocko@...nel.org> CC: <guohanjun@...wei.com>, <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>, <will.deacon@....com>, <dave.hansen@...el.com>, <sudeep.holla@....com>, <catalin.marinas@....com>, <mark.rutland@....com>, <robh+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>, <mike.kravetz@...cle.com>, <n-horiguchi@...jp.nec.com> Subject: [PATCH v4 0/2] arm64/hugetlb: enable gigantic page 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 <mhocko@...e.com> 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
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