From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [PATCH 08 of 11] anon-vma-rwsem From: Benjamin Herrenschmidt Reply-To: benh@kernel.crashing.org In-Reply-To: <20080507224406.GI8276@duo.random> References: <6b384bb988786aa78ef0.1210170958@duo.random> <20080507212650.GA8276@duo.random> <20080507222205.GC8276@duo.random> <20080507153103.237ea5b6.akpm@linux-foundation.org> <20080507224406.GI8276@duo.random> Content-Type: text/plain Date: Thu, 08 May 2008 09:28:38 +1000 Message-Id: <1210202918.1421.20.camel@pasglop> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrea Arcangeli Cc: Andrew Morton , torvalds@linux-foundation.org, clameter@sgi.com, steiner@sgi.com, holt@sgi.com, npiggin@suse.de, a.p.zijlstra@chello.nl, kvm-devel@lists.sourceforge.net, kanojsarcar@yahoo.com, rdreier@cisco.com, swise@opengridcomputing.com, linux-kernel@vger.kernel.org, avi@qumranet.com, linux-mm@kvack.org, general@lists.openfabrics.org, hugh@veritas.com, rusty@rustcorp.com.au, aliguori@us.ibm.com, chrisw@redhat.com, marcelo@kvack.org, dada1@cosmosbay.com, paulmck@us.ibm.com List-ID: On Thu, 2008-05-08 at 00:44 +0200, Andrea Arcangeli wrote: > > Please note, we can't allow a thread to be in the middle of > zap_page_range while mmu_notifier_register runs. You said yourself that mmu_notifier_register can be as slow as you want ... what about you use stop_machine for it ? I'm not even joking here :-) > vmtruncate takes 1 single lock, the i_mmap_lock of the inode. Not more > than one lock and we've to still take the global-system-wide lock > _before_ this single i_mmap_lock and no other lock at all. Ben. -- 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/ . Don't email: email@kvack.org