From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEE9DC19759 for ; Thu, 1 Aug 2019 15:07:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 734C7206B8 for ; Thu, 1 Aug 2019 15:07:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 734C7206B8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1AC1E8E0021; Thu, 1 Aug 2019 11:07:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 134ED8E0001; Thu, 1 Aug 2019 11:07:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EC9A78E0021; Thu, 1 Aug 2019 11:07:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-qk1-f197.google.com (mail-qk1-f197.google.com [209.85.222.197]) by kanga.kvack.org (Postfix) with ESMTP id C6AD88E0001 for ; Thu, 1 Aug 2019 11:07:31 -0400 (EDT) Received: by mail-qk1-f197.google.com with SMTP id v4so61432049qkj.10 for ; Thu, 01 Aug 2019 08:07:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:subject:to:cc :references:from:openpgp:autocrypt:organization:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=gPG0sW5lY7+Ikzw+Xs+Oy8EhM+sYnH0wOC94TLnhEjE=; b=EmZaaoHwGEH2zuhuBvOWBzgg+ySbXCHq6XE9zib+bYL5SPP+MICVA8VLZ6xt/3hQ8k 8T9fBlyLVrC26K0HBG+fXezkH8UQlJ/pAWWkGhJPc/spv7AFdGziLMiiNFZ7PBqNbHTC JeZzIhkmUmqEy0rIbK69QtmU4PJffmmzW4TmV2viM/E6mTOBr1hgfi55Oh4dLi9dHlJJ aksaPwM4zPw7GanvXT5bFo5iQtbf1Ey07EAYvS7NSnh2GIhiMluDSwsL3K9nqssGHQk6 UVLo/3VIoym3r2n+BW5vKZGYFeGx7SsyTnLSRZbjkNAWWvWLwejFm+yM4hccYFB+kcoU SqEA== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com X-Gm-Message-State: APjAAAWv4o3f0Uht/NPTeCaEG1pE3ys9ONnI8imUxZzVLUcCan/nG/Nc 5CZdMzfpr7yhq9WywmZ+AaJexvHkZwmhmYymFTA3o3Xp758k0mkZGYxIn2KtaZdkomSkNhkkzYP mdJj1f66zkiuqzplFSFhBy5YLrPe5BIVfUSifANpmxFhbxxURM5wP6q/vWD3nSkIHrg== X-Received: by 2002:a37:6813:: with SMTP id d19mr47754883qkc.454.1564672051579; Thu, 01 Aug 2019 08:07:31 -0700 (PDT) X-Google-Smtp-Source: APXvYqyWMpW0tH95pik1sdOH3VO5pYHyxnEYmcBdqNCxeyrnU3Nsp0t8CwxAaC7P7SdnDoQ+y4Wv X-Received: by 2002:a37:6813:: with SMTP id d19mr47754825qkc.454.1564672050960; Thu, 01 Aug 2019 08:07:30 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1564672050; cv=none; d=google.com; s=arc-20160816; b=n0OkVprnrA8uYwGCk93fGt/peGRQ5iJIThftGBvMFoglQ9WLcYi6ZncTikhs20z9i2 QH5ldCXslbu2vebAKyqWYelpvSEzp587G0wydfifbvMxYE+t4IEGb7YCXj1BkiUwY3MM uLz3ROVuwa7U1vBRiWtG6Q4Z9lludzhsmxLS/j39is9rA7ze8fOEiJXsziWLIThr0tI6 lkmBBRWa2c3kx/O1OVAD6Y0nZSbNPH0b8TJL05ufE9hcxDJt9lcFPBsaOmUCTjrPcAUQ GF2k7lyRf8aO8B+gaAx14Z475IijsgxE4BCwnzNPunfIgJZiFLAGYdzmatAhEjeB0v46 ABNQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:organization:autocrypt:openpgp:from :references:cc:to:subject; bh=gPG0sW5lY7+Ikzw+Xs+Oy8EhM+sYnH0wOC94TLnhEjE=; b=mv+wbEz3Q6mmsgltT/JR4rZNoqKJ3loQmkF/9XBMvw3WgmD2TaoFzl5aHuwO6l4He2 0Dpqcx0gRb/imw57j3NTkJIdg4T5X+G4wIJCmaeXYLC1XRjN8lyR2IrK3CPb2t5wF15b 5cdbOXEuYvMlvhr/U5yLS4YGSftkg7MT+lIA+Y2F6OrWwhyRYCaHAmKpn8DrdGLJ2hYM 11iZp423+E73OXWmETmrYXxnqsmd8NO0hHsmYT1HNpz4IwURsKE+FhKj3GXe/lIvQniU iLVuXyabYNz2QD728ysH1wr2PYsdmO7sJbSUwabGSxAwqud+rQH2HPcxQL5d5PTDjrJZ BFCA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id f10si39443254qkm.276.2019.08.01.08.07.30 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 01 Aug 2019 08:07:30 -0700 (PDT) Received-SPF: pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0EFD7793E5; Thu, 1 Aug 2019 15:07:30 +0000 (UTC) Received: from [10.36.116.115] (ovpn-116-115.ams2.redhat.com [10.36.116.115]) by smtp.corp.redhat.com (Postfix) with ESMTP id EA43260852; Thu, 1 Aug 2019 15:07:27 +0000 (UTC) Subject: Re: [PATCH v3 5/5] mm,memory_hotplug: Allow userspace to enable/disable vmemmap To: Oscar Salvador , akpm@linux-foundation.org Cc: dan.j.williams@intel.com, pasha.tatashin@soleen.com, mhocko@suse.com, anshuman.khandual@arm.com, Jonathan.Cameron@huawei.com, vbabka@suse.cz, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20190725160207.19579-1-osalvador@suse.de> <20190725160207.19579-6-osalvador@suse.de> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwX4EEwECACgFAljj9eoCGwMFCQlmAYAGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEE3eEPcA/4Na5IIP/3T/FIQMxIfNzZshIq687qgG 8UbspuE/YSUDdv7r5szYTK6KPTlqN8NAcSfheywbuYD9A4ZeSBWD3/NAVUdrCaRP2IvFyELj xoMvfJccbq45BxzgEspg/bVahNbyuBpLBVjVWwRtFCUEXkyazksSv8pdTMAs9IucChvFmmq3 jJ2vlaz9lYt/lxN246fIVceckPMiUveimngvXZw21VOAhfQ+/sofXF8JCFv2mFcBDoa7eYob s0FLpmqFaeNRHAlzMWgSsP80qx5nWWEvRLdKWi533N2vC/EyunN3HcBwVrXH4hxRBMco3jvM m8VKLKao9wKj82qSivUnkPIwsAGNPdFoPbgghCQiBjBe6A75Z2xHFrzo7t1jg7nQfIyNC7ez MZBJ59sqA9EDMEJPlLNIeJmqslXPjmMFnE7Mby/+335WJYDulsRybN+W5rLT5aMvhC6x6POK z55fMNKrMASCzBJum2Fwjf/VnuGRYkhKCqqZ8gJ3OvmR50tInDV2jZ1DQgc3i550T5JDpToh dPBxZocIhzg+MBSRDXcJmHOx/7nQm3iQ6iLuwmXsRC6f5FbFefk9EjuTKcLMvBsEx+2DEx0E UnmJ4hVg7u1PQ+2Oy+Lh/opK/BDiqlQ8Pz2jiXv5xkECvr/3Sv59hlOCZMOaiLTTjtOIU7Tq 7ut6OL64oAq+zsFNBFXLn5EBEADn1959INH2cwYJv0tsxf5MUCghCj/CA/lc/LMthqQ773ga uB9mN+F1rE9cyyXb6jyOGn+GUjMbnq1o121Vm0+neKHUCBtHyseBfDXHA6m4B3mUTWo13nid 0e4AM71r0DS8+KYh6zvweLX/LL5kQS9GQeT+QNroXcC1NzWbitts6TZ+IrPOwT1hfB4WNC+X 2n4AzDqp3+ILiVST2DT4VBc11Gz6jijpC/KI5Al8ZDhRwG47LUiuQmt3yqrmN63V9wzaPhC+ xbwIsNZlLUvuRnmBPkTJwwrFRZvwu5GPHNndBjVpAfaSTOfppyKBTccu2AXJXWAE1Xjh6GOC 8mlFjZwLxWFqdPHR1n2aPVgoiTLk34LR/bXO+e0GpzFXT7enwyvFFFyAS0Nk1q/7EChPcbRb hJqEBpRNZemxmg55zC3GLvgLKd5A09MOM2BrMea+l0FUR+PuTenh2YmnmLRTro6eZ/qYwWkC u8FFIw4pT0OUDMyLgi+GI1aMpVogTZJ70FgV0pUAlpmrzk/bLbRkF3TwgucpyPtcpmQtTkWS gDS50QG9DR/1As3LLLcNkwJBZzBG6PWbvcOyrwMQUF1nl4SSPV0LLH63+BrrHasfJzxKXzqg rW28CTAE2x8qi7e/6M/+XXhrsMYG+uaViM7n2je3qKe7ofum3s4vq7oFCPsOgwARAQABwsFl BBgBAgAPBQJVy5+RAhsMBQkJZgGAAAoJEE3eEPcA/4NagOsP/jPoIBb/iXVbM+fmSHOjEshl KMwEl/m5iLj3iHnHPVLBUWrXPdS7iQijJA/VLxjnFknhaS60hkUNWexDMxVVP/6lbOrs4bDZ NEWDMktAeqJaFtxackPszlcpRVkAs6Msn9tu8hlvB517pyUgvuD7ZS9gGOMmYwFQDyytpepo YApVV00P0u3AaE0Cj/o71STqGJKZxcVhPaZ+LR+UCBZOyKfEyq+ZN311VpOJZ1IvTExf+S/5 lqnciDtbO3I4Wq0ArLX1gs1q1XlXLaVaA3yVqeC8E7kOchDNinD3hJS4OX0e1gdsx/e6COvy qNg5aL5n0Kl4fcVqM0LdIhsubVs4eiNCa5XMSYpXmVi3HAuFyg9dN+x8thSwI836FoMASwOl C7tHsTjnSGufB+D7F7ZBT61BffNBBIm1KdMxcxqLUVXpBQHHlGkbwI+3Ye+nE6HmZH7IwLwV W+Ajl7oYF+jeKaH4DZFtgLYGLtZ1LDwKPjX7VAsa4Yx7S5+EBAaZGxK510MjIx6SGrZWBrrV TEvdV00F2MnQoeXKzD7O4WFbL55hhyGgfWTHwZ457iN9SgYi1JLPqWkZB0JRXIEtjd4JEQcx +8Umfre0Xt4713VxMygW0PnQt5aSQdMD58jHFxTk092mU+yIHj5LeYgvwSgZN4airXk5yRXl SE+xAvmumFBY Organization: Red Hat GmbH Message-ID: <3bb12bac-77a5-c53a-247b-6241c8381d30@redhat.com> Date: Thu, 1 Aug 2019 17:07:27 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190725160207.19579-6-osalvador@suse.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Thu, 01 Aug 2019 15:07:30 +0000 (UTC) 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: On 25.07.19 18:02, Oscar Salvador wrote: > 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 | 7 +++++++ > 3 files changed, 43 insertions(+) > > diff --git a/drivers/base/memory.c b/drivers/base/memory.c > index d30d0f6c8ad0..5ec6b80de9dd 100644 > --- a/drivers/base/memory.c > +++ b/drivers/base/memory.c > @@ -578,6 +578,35 @@ static DEVICE_ATTR_WO(soft_offline_page); > static DEVICE_ATTR_WO(hard_offline_page); > #endif > -ENODOCUMENTATION :) > +#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 > @@ -794,6 +823,10 @@ static struct attribute *memory_root_attrs[] = { > &dev_attr_hard_offline_page.attr, > #endif > > +#ifdef CONFIG_SPARSEMEM_VMEMMAP > + &dev_attr_vmemmap_hotplug.attr, Don't like the name of that property, sorry. > +#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 e1e8abf22a80..03d227d13301 100644 > --- a/include/linux/memory_hotplug.h > +++ b/include/linux/memory_hotplug.h > @@ -134,6 +134,9 @@ 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 09d41339cd11..5ffe5375b87c 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -68,6 +68,10 @@ 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 > @@ -1108,6 +1112,9 @@ static unsigned long mhp_check_flags(unsigned long flags) > if (!flags) > return 0; > > + if (!vmemmap_enabled) > + return 0; > + > if (flags != MHP_MEMMAP_ON_MEMORY) { > WARN(1, "Wrong flags value (%lx). Ignoring flags.\n", flags); > return 0; > Hmmm, I wonder if that should that rather be a per-memory device driver thingy? E.g., a toggle for ACPI which will then not pass in MHP_MEMMAP_ON_MEMORY. -- Thanks, David / dhildenb