linux-kernel - Re: Interactivity regression since v3.11 in mm/vmscan.c

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Message-ID: <5395863cbf23a_368f140f2f8cb@nysa.notmuch>
Date:	Mon, 09 Jun 2014 05:02:36 -0500
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Michal Hocko <mhocko@...e.cz>,
	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: Interactivity regression since v3.11 in mm/vmscan.c

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
> > <felipe.contreras@...il.com> wrote:
> > > On Fri, Jun 6, 2014 at 4:16 AM, Michal Hocko <mhocko@...e.cz> 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
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