From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f177.google.com (mail-wi0-f177.google.com [209.85.212.177]) by kanga.kvack.org (Postfix) with ESMTP id 10F966B0031 for ; Mon, 9 Jun 2014 03:54:01 -0400 (EDT) Received: by mail-wi0-f177.google.com with SMTP id f8so3765708wiw.10 for ; Mon, 09 Jun 2014 00:54:01 -0700 (PDT) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id jk20si10246362wic.0.2014.06.09.00.53.59 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 09 Jun 2014 00:54:00 -0700 (PDT) Date: Mon, 9 Jun 2014 09:53:58 +0200 From: Michal Hocko Subject: Re: Interactivity regression since v3.11 in mm/vmscan.c Message-ID: <20140609075358.GA7144@dhcp22.suse.cz> References: <53905594d284f_71f12992fc6a@nysa.notmuch> <20140605133747.GB2942@dhcp22.suse.cz> <20140606091620.GC26253@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Felipe Contreras Cc: Linux Kernel Mailing List , "linux-mm@kvack.org" , Andrew Morton , Linus Torvalds , Mel Gorman , KAMEZAWA Hiroyuki , Rik van Riel 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? -- Michal Hocko SUSE Labs -- 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