From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752834AbbFEN1m (ORCPT ); Fri, 5 Jun 2015 09:27:42 -0400 Received: from mail.skyhub.de ([78.46.96.112]:39118 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751389AbbFEN1j (ORCPT ); Fri, 5 Jun 2015 09:27:39 -0400 Date: Fri, 5 Jun 2015 15:27:36 +0200 From: Borislav Petkov To: Joerg Roedel , "H. Peter Anvin" , Ingo Molnar Cc: Thomas Gleixner , Konrad Rzeszutek Wilk , Vivek Goyal , Dave Young , Baoquan He , x86@kernel.org, kexec@lists.infradead.org, jroedel@suse.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/3 v3] Fix kdump failures with crashkernel=high Message-ID: <20150605132736.GF3679@pd.tnic> References: <1433500202-25531-1-git-send-email-joro@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1433500202-25531-1-git-send-email-joro@8bytes.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 05, 2015 at 12:29:59PM +0200, Joerg Roedel wrote: > v2->v3 > > * Rebased to v4.1-rc6 > * Updated changelogs as requested and added outcome of > previous discussions > * Added more Acked-bys > > v1->v2: > > * Updated comments based on feedback from Konrad > * Added Acked-bys > * Rebased to v3.19-rc3 > > Hi, > > here is a patch-set to fix failed kdump kernel boots when > the systems was booted with crashkernel=X,high. On those > systems the kernel allocates only 72MiB of low-memory for > DMA buffers, which showed to be too low on some systems. > > The problem is that 64MiB of the low-memory is allocated by > swiotlb, leaving 8MB for the page-allocator. But swiotlb > tries to allocate DMA memory from the page-allocator first, > which fails pretty fast in the boot sequence, causing > warnings. This patch-set removes these warnings. > > But even the 64MiB for swiotlb are eaten up on some systems, > so that the default of low-memory allocated for the > crash-kernel is increase from 72MB to 256MB (only changing > the defaults, can still be overwritten by crashkernel=X,low). > > This number comes from experiments on the affected systems, > 128MiB low-memory was still not enough there, thus I set the > value to 256MiB to fix the issues. > > Any feedback appreciated. > > Thanks, > > Joerg > > Joerg Roedel (3): > swiotlb: Warn on allocation failure in swiotlb_alloc_coherent > x86, swiotlb: Try coherent allocations with __GFP_NOWARN > x86, crash: Allocate enough low-mem when crashkernel=high > > arch/x86/kernel/pci-swiotlb.c | 7 +++++++ > arch/x86/kernel/setup.c | 5 ++++- > lib/swiotlb.c | 11 +++++++++-- > 3 files changed, 20 insertions(+), 3 deletions(-) Looks simple enough, all applied, thanks. hpa, Ingo, any concerns? -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --