From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lwLg5-00DiP5-Fy for kexec@lists.infradead.org; Thu, 24 Jun 2021 09:29:42 +0000 Date: Thu, 24 Jun 2021 17:29:30 +0800 From: Baoquan He Subject: Re: [PATCH RFC 0/2] dma-pool: allow user to disable atomic pool Message-ID: <20210624092930.GA802261@MiWiFi-R3L-srv> References: <20210624052010.5676-1-bhe@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Christoph Hellwig Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, rientjes@google.com, rppt@linux.ibm.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, kexec@lists.infradead.org, iommu@lists.linux-foundation.org, m.szyprowski@samsung.com, robin.murphy@arm.com On 06/24/21 at 08:40am, Christoph Hellwig wrote: > So reduce the amount allocated. But the pool is needed for proper > operation on systems with memory encryption. And please add the right > maintainer or at least mailing list for the code you're touching next > time. Oh, I thoutht it's memory issue only, should have run ./scripts/get_maintainer.pl. sorry. About reducing the amount allocated, it may not help. Because on x86_64, kdump kernel doesn't put any page of memory into buddy allocator of DMA zone. Means it will defenitely OOM for atomic_pool_dma initialization. Wondering in which case or on which device the atomic pool is needed on AMD system with mem encrytion enabled. As we can see, the OOM will happen too in kdump kernel on Intel system, even though it's not necessary. Thanks Baoquan _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec