From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id A86E46B004D for ; Thu, 7 May 2009 10:37:32 -0400 (EDT) Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen From: Peter Zijlstra In-Reply-To: References: <20090430072057.GA4663@eskimo.com> <20090430174536.d0f438dd.akpm@linux-foundation.org> <20090430205936.0f8b29fc@riellaptop.surriel.com> <20090430181340.6f07421d.akpm@linux-foundation.org> <20090430215034.4748e615@riellaptop.surriel.com> <20090430195439.e02edc26.akpm@linux-foundation.org> <49FB01C1.6050204@redhat.com> <20090501123541.7983a8ae.akpm@linux-foundation.org> <20090503031539.GC5702@localhost> <1241432635.7620.4732.camel@twins> <20090507121101.GB20934@localhost> <1241705702.11251.156.camel@twins> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Thu, 07 May 2009 16:38:01 +0200 Message-Id: <1241707081.11251.160.camel@twins> Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org To: Christoph Lameter Cc: Wu Fengguang , Andrew Morton , Rik van Riel , "linux-kernel@vger.kernel.org" , "tytso@mit.edu" , "linux-mm@kvack.org" , Elladan , Nick Piggin , Johannes Weiner , KOSAKI Motohiro List-ID: On Thu, 2009-05-07 at 10:18 -0400, Christoph Lameter wrote: > On Thu, 7 May 2009, Peter Zijlstra wrote: > > > It re-instates the young bit for PROT_EXEC pages, so that they will only > > be paged when they are really cold, or there is severe pressure. > > But they are rescanned until then. Really cold means what exactly? I do a > back up of a few hundred gigabytes and do not use firefox while the backup > is ongoing. Will the firefox pages still be in memory or not? Likely not. What this patch does is check the young bit on active_file scan, if its found to be set and the page is PROT_EXEC, put the page back on the active_file list, otherwise drop it to the inactive_file list. So if you haven't ran any firefox code, it should be gone from the active list after 2 full cycles, and from the inactive list on the first full inactive cycle after that. If you don't understand the patch, what are you complaining about, whats your point? -- 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