From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f72.google.com (mail-wm0-f72.google.com [74.125.82.72]) by kanga.kvack.org (Postfix) with ESMTP id 127FF6B0261 for ; Wed, 4 Jan 2017 05:19:52 -0500 (EST) Received: by mail-wm0-f72.google.com with SMTP id u144so83063426wmu.1 for ; Wed, 04 Jan 2017 02:19:52 -0800 (PST) Received: from mail-wj0-f194.google.com (mail-wj0-f194.google.com. [209.85.210.194]) by mx.google.com with ESMTPS id r129si77277364wmr.61.2017.01.04.02.19.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 04 Jan 2017 02:19:50 -0800 (PST) Received: by mail-wj0-f194.google.com with SMTP id hb5so41766166wjc.2 for ; Wed, 04 Jan 2017 02:19:50 -0800 (PST) From: Michal Hocko Subject: [PATCH 0/7 v2] vm, vmscan: enahance vmscan tracepoints Date: Wed, 4 Jan 2017 11:19:35 +0100 Message-Id: <20170104101942.4860-1-mhocko@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Mel Gorman , Johannes Weiner , Vlastimil Babka , Minchan Kim , Hillf Danton , linux-mm@kvack.org, LKML Hi, this is the second version of the patchset [1]. I hope I've addressed all the review feedback. While debugging [2] I've realized that there is some room for improvements in the tracepoints set we offer currently. I had hard times to make any conclusion from the existing ones. The resulting problem turned out to be active list aging [3] and we are missing at least two tracepoints to debug such a problem. Some existing tracepoints could export more information to see _why_ the reclaim progress cannot be made not only _how much_ we could reclaim. The later could be seen quite reasonably from the vmstat counters already. It can be argued that we are showing too many implementation details in those tracepoints but I consider them way too lowlevel already to be usable by any kernel independent userspace. I would be _really_ surprised if anything but debugging tools have used them. Any feedback is highly appreciated. [1] http://lkml.kernel.org/r/20161228153032.10821-1-mhocko@kernel.org [2] http://lkml.kernel.org/r/20161215225702.GA27944@boerne.fritz.box [3] http://lkml.kernel.org/r/20161223105157.GB23109@dhcp22.suse.cz -- 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