From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 17 Apr 2006 18:57:40 -0700 (PDT) From: Christoph Lameter Subject: Re: [PATCH 5/5] Swapless V2: Revise main migration logic In-Reply-To: <20060418094212.3ece222f.kamezawa.hiroyu@jp.fujitsu.com> Message-ID: References: <20060413235406.15398.42233.sendpatchset@schroedinger.engr.sgi.com> <20060413235432.15398.23912.sendpatchset@schroedinger.engr.sgi.com> <20060414101959.d59ac82d.kamezawa.hiroyu@jp.fujitsu.com> <20060414113455.15fd5162.kamezawa.hiroyu@jp.fujitsu.com> <20060415090639.dde469e8.kamezawa.hiroyu@jp.fujitsu.com> <20060417091830.bca60006.kamezawa.hiroyu@jp.fujitsu.com> <20060418090439.3e2f0df4.kamezawa.hiroyu@jp.fujitsu.com> <20060418094212.3ece222f.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: KAMEZAWA Hiroyuki Cc: akpm@osdl.org, hugh@veritas.com, linux-kernel@vger.kernel.org, lee.schermerhorn@hp.com, linux-mm@kvack.org, taka@valinux.co.jp, marcelo.tosatti@cyclades.com List-ID: On Tue, 18 Apr 2006, KAMEZAWA Hiroyuki wrote: > BTW, when copying mm, mm->mmap_sem is held. Is mm->mmap_sem is not held while > page migraion now ? I'm sorry I can't catch up all changes. > or Is this needed for lazy migration (migration-on-fault) ? mmap_sem must be held during page migration due to the way we retrieve the anonymous vma. I think you would want to get rid of that requirement for the hotplug remove. But how do we reliably get to the anon_vma of the page without mmap_sem? -- 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