From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f178.google.com (mail-ob0-f178.google.com [209.85.214.178]) by kanga.kvack.org (Postfix) with ESMTP id 5F5B36B0068 for ; Mon, 9 Jun 2014 06:02:41 -0400 (EDT) Received: by mail-ob0-f178.google.com with SMTP id wp4so1667145obc.9 for ; Mon, 09 Jun 2014 03:02:41 -0700 (PDT) Received: from mail-ob0-x235.google.com (mail-ob0-x235.google.com [2607:f8b0:4003:c01::235]) by mx.google.com with ESMTPS id cg3si26717775oec.44.2014.06.09.03.02.40 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 09 Jun 2014 03:02:40 -0700 (PDT) Received: by mail-ob0-f181.google.com with SMTP id wm4so5626521obc.40 for ; Mon, 09 Jun 2014 03:02:40 -0700 (PDT) Date: Mon, 09 Jun 2014 05:02:36 -0500 From: Felipe Contreras Message-ID: <5395863cbf23a_368f140f2f8cb@nysa.notmuch> In-Reply-To: <20140609075358.GA7144@dhcp22.suse.cz> References: <53905594d284f_71f12992fc6a@nysa.notmuch> <20140605133747.GB2942@dhcp22.suse.cz> <20140606091620.GC26253@dhcp22.suse.cz> <20140609075358.GA7144@dhcp22.suse.cz> Subject: Re: Interactivity regression since v3.11 in mm/vmscan.c Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko , Felipe Contreras Cc: Linux Kernel Mailing List , "linux-mm@kvack.org" , Andrew Morton , Linus Torvalds , Mel Gorman , KAMEZAWA Hiroyuki , Rik van Riel Michal Hocko wrote: > On Fri 06-06-14 18:11:14, Felipe Contreras wrote: > > On Fri, Jun 6, 2014 at 5:33 AM, Felipe Contreras > > wrote: > > > On Fri, Jun 6, 2014 at 4:16 AM, Michal Hocko wrote: > > > > > >> Mel has a nice systemtap script (attached) to watch for stalls. Maybe > > >> you can give it a try? > > > > > > Is there any special configurations I should enable? > > > > > > I get this: > > > semantic error: unresolved arity-1 global array name, missing global > > > declaration?: identifier 'name' at /tmp/stapd6pu9A:4:2 > > > source: name[t]=execname() > > > ^ > > > > > > Pass 2: analysis failed. [man error::pass2] > > > Number of similar error messages suppressed: 71. > > > Rerun with -v to see them. > > > Unexpected exit of STAP script at > > > /home/felipec/Downloads/watch-dstate-new.pl line 320. > > > > Actually I debugged the problem, and it's that the format of the > > script is DOS, not UNIX. After changing the format the script works. > > Ups, I've downloaded it from our bugzilla so maybe it just did some > tricks with the script. > > > However, it's not returning anything. It's running, but doesn't seem > > to find any stalls. > > Intereting. It was quite good at pointing at stalls. How are you > measuring those stalls during your testing? I'm not measuring them, I simply grab a GUI window and move it around while the big file is being copied, when the issue happens the window stops moving, and the mouse, everything hangs for a time, then it resumes, then hangs again... the interactivity is bad. -- Felipe Contreras -- 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