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 7244AC5B552 for ; Fri, 30 May 2025 09:15:30 +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=TBoLdDgTszvKcfmqb+9eLVb2IyFbtgcQV42UVzWvyCE=; b=xuetEbFFnG9e+LlCURtLNksWkL xNrx+o9+++iZ3GwMe+ycdqjjQMoI3Db3sAZ8uzVhx9s2j2Ewn7x4SCDu5Re75503ni1C3aJKxhO0t IdVfmXokTyMqUWIvbSbeLR8yD1E8mYXMlD50UVfLbJUsexRTN0/fMat4qmnDK46jw97eHR1/WKuOZ Hgpza5KD5saTewvYmbRplxLAAVqn3RVlSc6yF1+yrnl3j7lEad1yjGBW4qqt8fGMdON99r+2XHbgZ LstA2w0dEGZeuK1j5s+OcKhkraJqPePG7G2orea450eTiMIZQTB+E6OFXMEa/p+7osgpJ2FPAta+k Rb9JfgRw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uKvpq-000000005d0-04eM; Fri, 30 May 2025 09:15:30 +0000 Received: from mail-wm1-x332.google.com ([2a00:1450:4864:20::332]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uKviD-000000004mN-2AIH for kexec@lists.infradead.org; Fri, 30 May 2025 09:07:38 +0000 Received: by mail-wm1-x332.google.com with SMTP id 5b1f17b1804b1-450d668c2a1so4376045e9.0 for ; Fri, 30 May 2025 02:07:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1748596056; x=1749200856; darn=lists.infradead.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=TBoLdDgTszvKcfmqb+9eLVb2IyFbtgcQV42UVzWvyCE=; b=c7ao6A6q3Y9Y70dG4WBN8M7pgw+k94GCPM50c4GV4bXdT33a5CncBVdaPGPoY99sRF cWvSWmkgyAnYxSSHeO2ezI6ugTIVY/Hbj5FDwRHBy0nhZkkh4fvQogMollxKN1T7r0qG k5XqTTFMZvgpD+JRl5q8kft/wH+TUFW5NBnlUPMzqt/MEQ3lQkZuaepOoHIxESz+kJ1Y xeF1U1XsZXaBQz3UpweHKrz67Y931QaeGGrQUIMShYuY76zMAkwps5H/ICtPr7O2v0Yi +j2oD2eNgSWale0X3lBHpC978H6Xl0E9/jC10qq74xKn/uBjW/2tkzLA2I/SVi2JSl+b lKxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748596056; x=1749200856; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=TBoLdDgTszvKcfmqb+9eLVb2IyFbtgcQV42UVzWvyCE=; b=QJi00vCWVIupyArMkMC0lcjgofEW1htHG7zS/299dC6gYZFnfLGlO1/Jy/y8Z3MDuK n2+nDK5mLIDIdPhOkVgYe+KvZ5gvM2ntNlBKbxwsiF0GHULD/6YWMKViDGUhQBkc3JNG 2ETc+pnRUICVQCZhFL6C8FNA0p4oYpillqjr4u9YK+1ELbOFyx7THv3VxuprM3rzjqIN j05Pqc4He0iddFAz3r+IaectQFjIcUTrFrAbbvaK97kA82Pe81lHKkzGxlcaPnA5Cxer XI7FrgJJUGTlt8DccbXKCY0PIu0Co6VT9MTZo4tcJw0uelW17pB3ojKMAX49Ir35z5KX nxwg== X-Forwarded-Encrypted: i=1; AJvYcCUuUoy7/MPJgKVoPK36SXRG+JeUlrp52CJplWCx4TWwnfj5VGXJM91sNhMr9eECbTbABGmbOA==@lists.infradead.org X-Gm-Message-State: AOJu0YyrDlliEZwTEiYyREF4kZ0NVal3PxuhdFvcr4ULexdgdrNkQSgn OXiKbLrgavDqkg1uR07/rCHTa62qa/b2Nfj7nAQD97nEf67zq3jJ4nnC0H7kvY8MhVM= X-Gm-Gg: ASbGncvpTv1LgZQvXHoWrPiGC9HH2KpDX0jfrqqNtAtcJM27pFxBlY15lW+MUEo4fz9 LXlkoTRPqhvMU9iFeH+AhJpezhDmCic6mUKbpDHM2dlZ2FQOLPHLDFCyQ2YuC967sfUsC/RNMC1 CFFpgdjSvQdrjGW49DR94JB48NMJevzYxs79IxlaXouQts8CcPxNCkHOZrjojgfKjdUT4IcxFzS N+pHO7E6G05gGvaHC4lLpRZ5xm0rguoqW/O/F+iTNMGUkkUWoHSO7UtR2iFR0nrujFGDCK4X38g kzf96h/3Snl0KFOHuEBbmD1jxxDGNuEjiOpDkGSEpwdZH639hha/dYNjcpEnLNt43vuuoS15/13 88RilAvSW8A== X-Google-Smtp-Source: AGHT+IEqyiCNMlturDlCUFIxx4iLoEZ93zytjOhgqluhNHe7ssc/aGQOO2bx+VoGalmOEoFz61oKqg== X-Received: by 2002:a05:600c:34cd:b0:450:c9e3:91fe with SMTP id 5b1f17b1804b1-450d69abea4mr18955185e9.0.1748596055760; Fri, 30 May 2025 02:07:35 -0700 (PDT) Received: from localhost (109-81-89-112.rct.o2.cz. [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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250530_020737_557695_6BFD9813 X-CRM114-Status: GOOD ( 12.27 ) 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 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