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[195.135.221.5]) by mx.google.com with ESMTPS id o7si8086149ejd.303.2019.06.25.00.53.11 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Jun 2019 00:53:11 -0700 (PDT) Received-SPF: pass (google.com: domain of osalvador@suse.de designates 195.135.221.5 as permitted sender) client-ip=195.135.221.5; Authentication-Results: mx.google.com; spf=pass (google.com: domain of osalvador@suse.de designates 195.135.221.5 as permitted sender) smtp.mailfrom=osalvador@suse.de Received: from emea4-mta.ukb.novell.com ([10.120.13.87]) by smtp.nue.novell.com with ESMTP (TLS encrypted); Tue, 25 Jun 2019 09:53:10 +0200 Received: from suse.de (nwb-a10-snat.microfocus.com [10.120.13.201]) by emea4-mta.ukb.novell.com with ESMTP (NOT encrypted); Tue, 25 Jun 2019 08:52:35 +0100 From: Oscar Salvador To: akpm@linux-foundation.org Cc: mhocko@suse.com, dan.j.williams@intel.com, pasha.tatashin@soleen.com, Jonathan.Cameron@huawei.com, david@redhat.com, anshuman.khandual@arm.com, vbabka@suse.cz, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Oscar Salvador Subject: [PATCH v2 5/5] mm,memory_hotplug: Allow userspace to enable/disable vmemmap Date: Tue, 25 Jun 2019 09:52:27 +0200 Message-Id: <20190625075227.15193-6-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20190625075227.15193-1-osalvador@suse.de> References: <20190625075227.15193-1-osalvador@suse.de> 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: It seems that we have some users out there that want to expose all hotpluggable memory to userspace, so this implements a toggling mechanism for those users who want to disable it. By default, vmemmap pages mechanism is enabled. Signed-off-by: Oscar Salvador --- drivers/base/memory.c | 33 +++++++++++++++++++++++++++++++++ include/linux/memory_hotplug.h | 3 +++ mm/memory_hotplug.c | 6 +++++- 3 files changed, 41 insertions(+), 1 deletion(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index e0ac9a3b66f8..6fca2c96cc08 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -573,6 +573,35 @@ static DEVICE_ATTR_WO(soft_offline_page); static DEVICE_ATTR_WO(hard_offline_page); #endif +#ifdef CONFIG_SPARSEMEM_VMEMMAP +static ssize_t vmemmap_hotplug_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + if (vmemmap_enabled) + return sprintf(buf, "enabled\n"); + else + return sprintf(buf, "disabled\n"); +} + +static ssize_t vmemmap_hotplug_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (sysfs_streq(buf, "enable")) + vmemmap_enabled = true; + else if (sysfs_streq(buf, "disable")) + vmemmap_enabled = false; + else + return -EINVAL; + + return count; +} +static DEVICE_ATTR_RW(vmemmap_hotplug); +#endif + /* * Note that phys_device is optional. It is here to allow for * differentiation between which *physical* devices each @@ -799,6 +828,10 @@ static struct attribute *memory_root_attrs[] = { &dev_attr_hard_offline_page.attr, #endif +#ifdef CONFIG_SPARSEMEM_VMEMMAP + &dev_attr_vmemmap_hotplug.attr, +#endif + &dev_attr_block_size_bytes.attr, &dev_attr_auto_online_blocks.attr, NULL diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index e28e226c9a20..94b4adc1a0ba 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -131,6 +131,9 @@ extern int arch_add_memory(int nid, u64 start, u64 size, struct mhp_restrictions *restrictions); extern u64 max_mem_size; +#ifdef CONFIG_SPARSEMEM_VMEMMAP +extern bool vmemmap_enabled; +#endif extern bool memhp_auto_online; /* If movable_node boot option specified */ extern bool movable_node_enabled; diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index b5106cb75795..32ee6fb7d3bf 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -70,6 +70,10 @@ void put_online_mems(void) bool movable_node_enabled = false; +#ifdef CONFIG_SPARSEMEM_VMEMMAP +bool vmemmap_enabled __read_mostly = true; +#endif + #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE bool memhp_auto_online; #else @@ -1168,7 +1172,7 @@ int __ref add_memory_resource(int nid, struct resource *res, unsigned long flags goto error; new_node = ret; - if (mhp_check_correct_flags(flags)) + if (vmemmap_enabled && mhp_check_correct_flags(flags)) restrictions.flags = flags; /* call arch's memory hotadd */ -- 2.12.3