From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4613BC5D.2070404@redhat.com> Date: Wed, 04 Apr 2007 10:55:25 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: missing madvise functionality References: <46128051.9000609@redhat.com> <46128CC2.9090809@redhat.com> <20070403172841.GB23689@one.firstfloor.org> <20070403125903.3e8577f4.akpm@linux-foundation.org> <4612B645.7030902@redhat.com> <20070403202937.GE355@devserv.devel.redhat.com> <20070403144948.fe8eede6.akpm@linux-foundation.org> <20070403160231.33aa862d.akpm@linux-foundation.org> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Hugh Dickins Cc: Andrew Morton , Jakub Jelinek , Ulrich Drepper , Andi Kleen , Linux Kernel , linux-mm@kvack.org List-ID: Hugh Dickins wrote: > (I didn't understand how Rik would achieve his point 5, _no_ lock > contention while repeatedly re-marking these pages, but never mind.) The CPU marks them accessed&dirty when they are reused. The VM only moves the reused pages back to the active list on memory pressure. This means that when the system is not under memory pressure, the same page can simply stay PG_lazyfree for multiple malloc/free rounds. -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. -- 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