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Mon, 11 Jan 2021 11:55:40 -0500 X-MC-Unique: wSNQmkLbMAOfiiQjLDy1ww-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 742411005E49; Mon, 11 Jan 2021 16:55:39 +0000 (UTC) Received: from [10.36.115.103] (ovpn-115-103.ams2.redhat.com [10.36.115.103]) by smtp.corp.redhat.com (Postfix) with ESMTP id 04E535D9DB; Mon, 11 Jan 2021 16:55:37 +0000 (UTC) Subject: Re: [PATCH 4/5] powerpc/memhotplug: Enable MHP_MEMMAP_ON_MEMORY when supported To: Oscar Salvador , akpm@linux-foundation.org Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com References: <20201217130758.11565-1-osalvador@suse.de> <20201217130758.11565-5-osalvador@suse.de> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: Date: Mon, 11 Jan 2021 17:55:37 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <20201217130758.11565-5-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 10.5.11.14 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 17.12.20 14:07, Oscar Salvador wrote: > Let the caller check whether it can pass MHP_MEMMAP_ON_MEMORY by > checking mhp_supports_memmap_on_memory(). > MHP_MEMMAP_ON_MEMORY can only be set in case > ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE is enabled, the architecture supports > altmap, and the range to be added spans a single memory block. > > Signed-off-by: Oscar Salvador > --- > arch/powerpc/platforms/pseries/hotplug-memory.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c > index 7efe6ec5d14a..a7f68e282ec1 100644 > --- a/arch/powerpc/platforms/pseries/hotplug-memory.c > +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c > @@ -610,6 +610,7 @@ static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index) > > static int dlpar_add_lmb(struct drmem_lmb *lmb) > { > + mhp_t mhp_flags = MHP_NONE; > unsigned long block_sz; > int nid, rc; > > @@ -629,8 +630,10 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb) > if (nid < 0 || !node_possible(nid)) > nid = first_online_node; > > + if (mhp_supports_memmap_on_memory(block_sz)) > + mhp_flags |= MHP_MEMMAP_ON_MEMORY; > /* Add the memory */ > - rc = __add_memory(nid, lmb->base_addr, block_sz, MHP_NONE); > + rc = __add_memory(nid, lmb->base_addr, block_sz, mhp_flags); > if (rc) { > invalidate_lmb_associativity_index(lmb); > return rc; With 16MB LMBs it's quite wasteful - you won't even have a huge page fitting the the remaining part. I do wonder if we want this on powerpc only with a bigger LMB/memory block size (e.g., 256 MB, which is AFAIK the maximum usually found). -- Thanks, David / dhildenb