From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with ESMTP id DFFDB8D0039 for ; Fri, 18 Mar 2011 15:41:03 -0400 (EDT) Received: by wyf19 with SMTP id 19so5197568wyf.14 for ; Fri, 18 Mar 2011 12:40:58 -0700 (PDT) Date: Fri, 18 Mar 2011 19:41:35 +0000 From: Prasad Joshi Subject: [RFC][PATCH v3 00/22] __vmalloc: Propagating GFP allocation flag inside __vmalloc() Message-ID: <20110318194135.GA4746@prasad-kvm> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, prasadjoshi124@gmail.com, mitra@kqinfotech.com Cc: chris@zankel.net, x86@kernel.org, jdike@addtoit.com, tj@kernel.org, cmetcalf@tilera.com, linux-sh@vger.kernel.org, liqin.chen@sunplusct.com, lennox.wu@gmail.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, linux390@de.ibm.com, benh@kernel.crashing.org, paulus@samba.org, linuxppc-dev@lists.ozlabs.org, kyle@mcmartin.ca, deller@gmx.de, jejb@parisc-linux.org, linux-parisc@vger.kernel.org, dhowells@redhat.com, yasutake.koichi@jp.panasonic.com, linux-am33-list@redhat.com, ralf@linux-mips.org, linux-mips@linux-mips.org, monstr@monstr.eu, microblaze-uclinux@itee.uq.edu.au, geert@linux-m68k.org, zippel@linux-m68k.org, sammy@sammy.net, linux-m68k@lists.linux-m68k.org, takata@linux-m32r.org, linux-m32r@ml.linux-m32r.org, tony.luck@intel.com, fenghua.yu@intel.com, linux-ia64@vger.kernel.org, starvik@axis.com, jesper.nilsson@axis.com, linux-cris-kernel@axis.com, hans-christian.egtvedt@atmel.com, linux@arm.linux.org.uk, rth@twiddle.net, linux-alpha@vger.kernel.org A filesystem might run into a problem while calling __vmalloc(GFP_NOFS) inside a lock. It is expected than __vmalloc when called with GFP_NOFS should not callback the filesystem code even incase of the increased memory pressure. But the problem is that even if we pass this flag, __vmalloc itself allocates memory with GFP_KERNEL. Using GFP_KERNEL allocations may go into the memory reclaim path and try to free memory by calling file system evict_inode function. Which might lead into deadlock. For further details http://marc.info/?l=linux-mm&m=128942194520631&w=4 https://bugzilla.kernel.org/show_bug.cgi?id=30702 The patch passes the gfp allocation flag all the way down to those allocating functions. arch/arm/include/asm/pgalloc.h | 11 +++++- arch/avr32/include/asm/pgalloc.h | 8 ++++- arch/cris/include/asm/pgalloc.h | 10 ++++- arch/frv/include/asm/pgalloc.h | 3 ++ arch/frv/include/asm/pgtable.h | 1 + arch/frv/mm/pgalloc.c | 9 ++++- arch/ia64/include/asm/pgalloc.h | 24 +++++++++++-- arch/m32r/include/asm/pgalloc.h | 11 ++++-- arch/m68k/include/asm/motorola_pgalloc.h | 20 +++++++++-- arch/m68k/include/asm/sun3_pgalloc.h | 14 ++++++-- arch/m68k/mm/memory.c | 9 ++++- arch/microblaze/include/asm/pgalloc.h | 3 ++ arch/microblaze/mm/pgtable.c | 13 +++++-- arch/mips/include/asm/pgalloc.h | 22 ++++++++---- arch/mn10300/include/asm/pgalloc.h | 2 + arch/mn10300/mm/pgtable.c | 10 ++++- arch/parisc/include/asm/pgalloc.h | 21 ++++++++--- arch/powerpc/include/asm/pgalloc-32.h | 2 + arch/powerpc/include/asm/pgalloc-64.h | 27 +++++++++++--- arch/powerpc/mm/pgtable_32.c | 10 ++++- arch/s390/include/asm/pgalloc.h | 30 +++++++++++++--- arch/s390/mm/pgtable.c | 22 +++++++++--- arch/score/include/asm/pgalloc.h | 13 ++++--- arch/sh/include/asm/pgalloc.h | 8 ++++- arch/sh/mm/pgtable.c | 8 ++++- arch/sparc/include/asm/pgalloc_32.h | 5 +++ arch/sparc/include/asm/pgalloc_64.h | 17 ++++++++- arch/tile/include/asm/pgalloc.h | 13 ++++++- arch/tile/mm/pgtable.c | 10 ++++- arch/um/include/asm/pgalloc.h | 1 + arch/um/kernel/mem.c | 21 ++++++++--- arch/x86/include/asm/pgalloc.h | 17 ++++++++- arch/x86/mm/pgtable.c | 8 ++++- arch/xtensa/include/asm/pgalloc.h | 9 ++++- arch/xtensa/mm/pgtable.c | 11 +++++- include/asm-generic/4level-fixup.h | 8 +++- include/asm-generic/pgtable-nopmd.h | 3 +- include/asm-generic/pgtable-nopud.h | 1 + include/linux/mm.h | 40 ++++++++++++++++----- mm/memory.c | 14 ++++--- mm/vmalloc.c | 57 ++++++++++++++++++++---------- 41 files changed, 427 insertions(+), 119 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org