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[109.81.89.112]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-450d7f1b0a4sm12546965e9.0.2025.05.30.02.07.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 May 2025 02:07:35 -0700 (PDT) Date: Fri, 30 May 2025 11:07:34 +0200 From: Michal Hocko To: David Hildenbrand Cc: Baoquan He , Donald Dutile , Jiri Bohac , Vivek Goyal , Dave Young , kexec@lists.infradead.org, Philipp Rudo , Pingfan Liu , Tao Liu , linux-kernel@vger.kernel.org, David Hildenbrand Subject: Re: [PATCH v2 0/5] kdump: crashkernel reservation from CMA Message-ID: References: <04904e86-5b5f-4aa1-a120-428dac119189@redhat.com> <427fec88-2a74-471e-aeb6-a108ca8c4336@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Fri 30-05-25 10:39:39, David Hildenbrand wrote: > On 30.05.25 10:28, Michal Hocko wrote: [...] > > All that being said I would go with an additional parameter to the > > kdump cma setup - e.g. cma_sane_dma that would skip waiting and use 10s > > otherwise. That would make the optimized behavior opt in, we do not need > > to support all sorts of timeouts and also learn if this is not > > sufficient. > > > > Makes sense? > > Just so I understand correctly, you mean extending the "crashkernel=" option > with a boolean parameter? If set, e.g., wait 1s, otherwise magic number 10? crashkernel=1G,cma,cma_sane_dma # no wait on transition crashkernel=1G,cma # wait on transition with e.g. 10s timeout -- Michal Hocko SUSE Labs