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=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 D8239C10F27 for ; Wed, 11 Mar 2020 12:56:26 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 879502146E for ; Wed, 11 Mar 2020 12:56:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="STC5jLeH" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 879502146E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (unknown [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 48csQw3SmGzDqWP for ; Wed, 11 Mar 2020 23:56:24 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=redhat.com (client-ip=207.211.31.120; helo=us-smtp-1.mimecast.com; envelope-from=david@redhat.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=STC5jLeH; dkim-atps=neutral Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48crsj6FcqzDqN1 for ; Wed, 11 Mar 2020 23:31:05 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583929863; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/sbomtSLrHdGOruJ2tgfKohuV+eWUZQ6CK4TodM1MVc=; b=STC5jLeHV9F4WtrqjEZC2ycbbcD4zT57tkRKa875veFqojGxavYXiOWRkbkWalv+C1Y4CE x8QvZzd1VTG5Rm7kHVZbVhxMA/YzSzto0nCsAMLWK4TznS/a/YtzUc9ltSUqv6urpKmamc P/0lw2Nh9UHkzf4tqhJ99mvTHdiWVf0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-23-qxhbtyNkOxiHCZULO3cxRA-1; Wed, 11 Mar 2020 08:31:01 -0400 X-MC-Unique: qxhbtyNkOxiHCZULO3cxRA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D47CBDBA7; Wed, 11 Mar 2020 12:30:59 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.36.118.45]) by smtp.corp.redhat.com (Postfix) with ESMTP id C017D5C1D4; Wed, 11 Mar 2020 12:30:55 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Subject: [PATCH v1 5/5] mm/memory_hotplug: allow to specify a default online_type Date: Wed, 11 Mar 2020 13:30:26 +0100 Message-Id: <20200311123026.16071-6-david@redhat.com> In-Reply-To: <20200311123026.16071-1-david@redhat.com> References: <20200311123026.16071-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Content-Transfer-Encoding: quoted-printable X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hyperv@vger.kernel.org, Baoquan He , David Hildenbrand , Greg Kroah-Hartman , "Rafael J. Wysocki" , Michal Hocko , linux-mm@kvack.org, Andrew Morton , Wei Yang , linuxppc-dev@lists.ozlabs.org, Oscar Salvador Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" For now, distributions implement advanced udev rules to essentially - Don't online any hotplugged memory (s390x) - Online all memory to ZONE_NORMAL (e.g., most virt environments like hyperv) - Online all memory to ZONE_MOVABLE in case the zone imbalance is taken care of (e.g., bare metal, special virt environments) In summary: All memory is usually onlined the same way, however, the kernel always has to ask userspace to come up with the same answer. E.g., HyperV always waits for a memory block to get onlined before continuing, otherwise it might end up adding memory faster than hotplugging it, which can result in strange OOM situations. Let's allow to specify a default online_type, not just "online" and "offline". This allows distributions to configure the default online_type when booting up and be done with it. We can now specify "offline", "online", "online_movable" and "online_kernel" via - "memhp_default_state=3D" on the kernel cmdline - /sys/devices/systemn/memory/auto_online_blocks just like we are able to specify for a single memory block via /sys/devices/systemn/memory/memoryX/state Cc: Greg Kroah-Hartman Cc: Andrew Morton Cc: Michal Hocko Cc: Oscar Salvador Cc: "Rafael J. Wysocki" Cc: Baoquan He Cc: Wei Yang Signed-off-by: David Hildenbrand --- drivers/base/memory.c | 11 +++++------ include/linux/memory_hotplug.h | 2 ++ mm/memory_hotplug.c | 8 ++++---- 3 files changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 8d3e16dab69f..2b09b68b9f78 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -35,7 +35,7 @@ static const char *const online_type_to_str[] =3D { [MMOP_ONLINE_MOVABLE] =3D "online_movable", }; =20 -static int memhp_online_type_from_str(const char *str) +int memhp_online_type_from_str(const char *str) { int i; =20 @@ -394,13 +394,12 @@ static ssize_t auto_online_blocks_store(struct devi= ce *dev, struct device_attribute *attr, const char *buf, size_t count) { - if (sysfs_streq(buf, "online")) - memhp_default_online_type =3D MMOP_ONLINE; - else if (sysfs_streq(buf, "offline")) - memhp_default_online_type =3D MMOP_OFFLINE; - else + const int online_type =3D memhp_online_type_from_str(buf); + + if (online_type < 0) return -EINVAL; =20 + memhp_default_online_type =3D online_type; return count; } =20 diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplu= g.h index c6e090b34c4b..ef55115320fb 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -117,6 +117,8 @@ extern int arch_add_memory(int nid, u64 start, u64 si= ze, struct mhp_restrictions *restrictions); extern u64 max_mem_size; =20 +extern int memhp_online_type_from_str(const char *str); + /* Default online_type (MMOP_*) when new memory blocks are added. */ extern int memhp_default_online_type; /* If movable_node boot option specified */ diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 01443c70aa27..4a96273eafa7 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -75,10 +75,10 @@ EXPORT_SYMBOL_GPL(memhp_default_online_type); =20 static int __init setup_memhp_default_state(char *str) { - if (!strcmp(str, "online")) - memhp_default_online_type =3D MMOP_ONLINE; - else if (!strcmp(str, "offline")) - memhp_default_online_type =3D MMOP_OFFLINE; + const int online_type =3D memhp_online_type_from_str(str); + + if (online_type >=3D 0) + memhp_default_online_type =3D online_type; =20 return 1; } --=20 2.24.1