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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2EFA1C88E75 for ; Fri, 18 Sep 2026 08:17:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ZIXFX9rBIG9zQg5hvTNUaSYyxqeWifxp86PFRRFK6Cc=; b=EywyQfw5PUm0oKXYi0NOswA0WP mEVFhbFqqLp1hmhyUKGdw4oiObUld5lgd6tpoP9Lg0unpHadWVDcr+xcGD4vrT6L7UIfs+p4H0GE4 CxQb5UbQQB4u5+yOV+BD/gmyGy2vUZ1Qoeeyr7vbl4rT9eeDOAry2+Tqs1Y9jhptvCYbA0rHph22q nHuMXh0citF4Z+PsmpYCDW7eRd1VbBQLQeApOZ/pAhi4Y0QxtZH+Ku/k3j3dh+SXPY+YaxN5vdw2C GFYi49FY3VunmjN+GvlNainMZ5zwSTiPhPpjYkteBXFSuQI0ucUmBx/Qb9vdAns013RQas9WJa0k0 0enyUuJA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x7Tn3-0000000Dmf6-15DT; Fri, 18 Sep 2026 08:17:49 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x7Tn1-0000000Dme4-3QGw for kexec@bombadil.infradead.org; Fri, 18 Sep 2026 08:17:47 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=ZIXFX9rBIG9zQg5hvTNUaSYyxqeWifxp86PFRRFK6Cc=; b=VW3gGfm6B7ToLDVDg8ljpQ0pZS ZBEjTq27C+5kyyAkMs/zCUSf/YW07XPPoz6JluTswf8bDFk+OwsOeqAdpKGV4ONYw3y2co2BTnIwu 3zVAfD615UwcSCYOA//RKoV9XqgQjClwaqsrrpwmWWB632em4uEAF9pXQUxokmM30nFVGISWmdJ0s FNG4NPOYUCObaUWJ71MC/Dk7zd+TKkAWz4LtcZnKI/ucvIdzsBXEJXVBzMYZ6SyVUNLJQ4Rrkj2tJ JdLWHEPxGtJAnWFhUXu2u9YU9drW4ZBkkaPhkjl7JSgPrd07ZNa07yOKELRcNivEel8TMMEy4BQnp UUcN4IFQ==; Received: from out-189.mta0.migadu.com ([2001:41d0:1004:224b::bd] helo=mta0.migadu.com) by desiato.infradead.org with esmtps (Exim 4.99.2 #2 (Red Hat Linux)) id 1x7Tmy-00000009mBY-1vLp for kexec@lists.infradead.org; Fri, 18 Sep 2026 08:17:46 +0000 X-Envelope-To: kexec@lists.infradead.org DKIM-Signature: a=rsa-sha256; bh=j93Rw5e85f6pY7eCSjFAVhVix8y2aM8tStuN+RPXRkw=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789719462; v=1; x=1790324262; b=OiC8qhaWNDJzjEhthmyQFnc4uzYwiPYNtFNPfXa9HpOYVFbaRC91p32pnH+cv2Jp3gpGwyAn xUyvX0qNGfK98lkix16baIzuwWun/ft2uEwgm+w7nRG88jPCcsqOb/szmglVZZ/h7WrXVJq6XWC vGpsrDM1EjJ+uAjhB6cNQIRI= X-Envelope-To: kexec@lists.infradead.org Received: by mta10.migadu.com with ESMTPS id d0581680cb0ed85c; Fri, 18 Sep 2026 08:17:42 +0000 X-Mizu-Trace-ID: d0581680cb0ed85c X-Migadu-Flow: FLOW_OUT Date: Fri, 18 Sep 2026 16:17:32 +0800 From: Baoquan He To: Wandun Chen Cc: catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, robh@kernel.org, saravanak@kernel.org, akpm@linux-foundation.org, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, m.szyprowski@samsung.com, mark.rutland@arm.com, kernel@xen0n.name, alex@ghiti.fr, hpa@zytor.com, ruirui.yang@linux.dev, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, iommu@lists.linux.dev Subject: Re: [PATCH v6 00/10] kdump: reduce vmcore size and capture time Message-ID: References: <20260902073116.802752-1-chenwandun1@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260902073116.802752-1-chenwandun1@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260918_091744_740111_31196AC9 X-CRM114-Status: UNSURE ( 8.09 ) X-CRM114-Notice: Please train this message. X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 09/02/26 at 03:31pm, Wandun Chen wrote: > From: Wandun Chen > ...snip... > ACPI systems already filter reserved memory out of the vmcore through > their existing path; only DT-based systems currently fail to filter these > regions, which is what this series addresses. The flag lives in memblock > itself rather than in a DT-only structure, so the mechanism is generic and ~~~ The patchset itself looks goot to me, while I am concerned if it's really generic. I raised that in sub-thread talking with Wandun. Imagine I tried to exclude many driver regions and split memblock regions into hundreds, cma could yell out: cma_declare_contiguous_multi()? IMHO, withdrawing the claim can fix the nit concern. If I am wrong, please help point it out to let me learn more. Thanks Baoquan > both ACPI and DT systems can benefit from it (suggested by Rob, thanks) [1]. > > Since the reserved memory regions are filtered out, the vmcore is > smaller in size and faster to produce. > ...snip...