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Tue, 18 May 2021 02:21:31 -0700 (PDT) Received: from localhost.localdomain ([139.177.225.234]) by smtp.gmail.com with ESMTPSA id p11sm12025262pgn.65.2021.05.18.02.21.26 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 May 2021 02:21:30 -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 Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, duanxiongchun@bytedance.com, fam.zheng@bytedance.com, zhengqi.arch@bytedance.com, Muchun Song Subject: [PATCH] arm64: mm: hugetlb: add support for free vmemmap pages of HugeTLB Date: Tue, 18 May 2021 17:18:26 +0800 Message-Id: <20210518091826.36937-1-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) MIME-Version: 1.0 X-Rspamd-Queue-Id: D658C80192FD Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=bytedance-com.20150623.gappssmtp.com header.s=20150623 header.b=1L3udiYJ; spf=pass (imf27.hostedemail.com: domain of songmuchun@bytedance.com designates 209.85.214.169 as permitted sender) smtp.mailfrom=songmuchun@bytedance.com; dmarc=pass (policy=none) header.from=bytedance.com X-Rspamd-Server: rspam04 X-Stat-Signature: k7jh77gzfj1xtaqks7n8howrpz7penx9 X-HE-Tag: 1621329690-540685 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The preparation of supporting freeing vmemmap associated with each HugeTLB page is ready, so we can support this feature for arm64. Signed-off-by: Muchun Song --- arch/arm64/mm/mmu.c | 5 +++++ fs/Kconfig | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 5d37e461c41f..967b01ce468d 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -1134,6 +1135,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, pmd_t *pmdp; WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END)); + + if (is_hugetlb_free_vmemmap_enabled() && !altmap) + return vmemmap_populate_basepages(start, end, node, altmap); + do { next = pmd_addr_end(addr, end); diff --git a/fs/Kconfig b/fs/Kconfig index 6ce6fdac00a3..02c2d3bf1cb8 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -242,7 +242,7 @@ config HUGETLB_PAGE config HUGETLB_PAGE_FREE_VMEMMAP def_bool HUGETLB_PAGE - depends on X86_64 + depends on X86_64 || ARM64 depends on SPARSEMEM_VMEMMAP config MEMFD_CREATE