From patchwork Sun Dec 26 08:39:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 12699307 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C800CC433F5 for ; Sun, 26 Dec 2021 08:29:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0C94F6B0075; Sun, 26 Dec 2021 03:29:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id EF1496B007E; Sun, 26 Dec 2021 03:29:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C9AA86B0078; Sun, 26 Dec 2021 03:29:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0108.hostedemail.com [216.40.44.108]) by kanga.kvack.org (Postfix) with ESMTP id B19556B0075 for ; Sun, 26 Dec 2021 03:29:53 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 61405181AC9C6 for ; Sun, 26 Dec 2021 08:29:53 +0000 (UTC) X-FDA: 78959272266.19.0D13307 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by imf22.hostedemail.com (Postfix) with ESMTP id 5917AC0029 for ; Sun, 26 Dec 2021 08:29:51 +0000 (UTC) Received: from dggpemm500022.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4JMDRH0Tw8zZdkM; Sun, 26 Dec 2021 16:26:35 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggpemm500022.china.huawei.com (7.185.36.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Sun, 26 Dec 2021 16:29:49 +0800 Received: from localhost.localdomain.localdomain (10.175.113.25) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Sun, 26 Dec 2021 16:29:48 +0800 From: Kefeng Wang To: Jonathan Corbet , Andrew Morton , , , , , , CC: Nicholas Piggin , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Michael Ellerman , "Benjamin Herrenschmidt" , Paul Mackerras , Kefeng Wang Subject: [PATCH 1/3] mm: vmalloc: Let user to control huge vmalloc default behavior Date: Sun, 26 Dec 2021 16:39:10 +0800 Message-ID: <20211226083912.166512-2-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20211226083912.166512-1-wangkefeng.wang@huawei.com> References: <20211226083912.166512-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected X-Stat-Signature: 7cm9qd5eb6w4n83n3xqnkh1kdigwnpth X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5917AC0029 Authentication-Results: imf22.hostedemail.com; dkim=none; spf=pass (imf22.hostedemail.com: domain of wangkefeng.wang@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=wangkefeng.wang@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com X-HE-Tag: 1640507391-154574 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: Add HUGE_VMALLOC_DEFAULT_ENABLED to let user to choose whether or not enable huge vmalloc mappings by default, and this could make more architectures to enable huge vmalloc mappings feature but don't want to enable it by default. Add hugevmalloc=on/off parameter to enable or disable this feature at boot time, nohugevmalloc is still supported and equivalent to hugevmalloc=off. Signed-off-by: Kefeng Wang --- .../admin-guide/kernel-parameters.txt | 12 ++++++++++++ arch/powerpc/Kconfig | 1 + mm/Kconfig | 7 +++++++ mm/vmalloc.c | 18 +++++++++++++++++- 4 files changed, 37 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 2fba82431efb..4107136097a6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1629,6 +1629,18 @@ If both parameters are enabled, hugetlb_free_vmemmap takes precedence over memory_hotplug.memmap_on_memory. + + hugevmalloc= [PPC] Reguires CONFIG_HAVE_ARCH_HUGE_VMALLOC + Format: { on | off } + Default set by CONFIG_HUGE_VMALLOC_DEFAULT_ENABLED. + + This parameter enables/disables kernel huge vmalloc + mappings at boot time. + + on: Enable the feature + off: Disable the feature + Equivalent to: nohugevmalloc + hung_task_panic= [KNL] Should the hung task detector generate panics. Format: 0 | 1 diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index dea74d7717c0..d59b221be264 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -246,6 +246,7 @@ config PPC select HAVE_STATIC_CALL if PPC32 select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING + select HUGE_VMALLOC_DEFAULT_ENABLED if HAVE_ARCH_HUGE_VMALLOC select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE select IOMMU_HELPER if PPC64 select IRQ_DOMAIN diff --git a/mm/Kconfig b/mm/Kconfig index 356f4f2c779e..4ba91c0359bd 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -262,6 +262,13 @@ config HUGETLB_PAGE_SIZE_VARIABLE HUGETLB_PAGE_ORDER when there are multiple HugeTLB page sizes available on a platform. +config HUGE_VMALLOC_DEFAULT_ENABLED + bool "Enable huge vmalloc mappings by default" + depends on HAVE_ARCH_HUGE_VMALLOC + help + Enable huge vmalloc mappings by default, this value could be overridden + by hugevmalloc=off|on. + config CONTIG_ALLOC def_bool (MEMORY_ISOLATION && COMPACTION) || CMA diff --git a/mm/vmalloc.c b/mm/vmalloc.c index d2a00ad4e1dd..3b6f99753816 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -58,7 +58,7 @@ static const unsigned int ioremap_max_page_shift = PAGE_SHIFT; #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC -static bool __ro_after_init vmap_allow_huge = true; +static bool __ro_after_init vmap_allow_huge = IS_ENABLED(CONFIG_HUGE_VMALLOC_DEFAULT_ENABLED); static int __init set_nohugevmalloc(char *str) { @@ -66,6 +66,22 @@ static int __init set_nohugevmalloc(char *str) return 0; } early_param("nohugevmalloc", set_nohugevmalloc); + +static int __init set_hugevmalloc(char *str) +{ + if (!str) + return -EINVAL; + + if (!strcmp(str, "on")) + vmap_allow_huge = true; + else if (!strcmp(str, "off")) + vmap_allow_huge = true; + else + return -EINVAL; + + return 0; +} +early_param("hugevmalloc=", set_hugevmalloc); #else /* CONFIG_HAVE_ARCH_HUGE_VMALLOC */ static const bool vmap_allow_huge = false; #endif /* CONFIG_HAVE_ARCH_HUGE_VMALLOC */