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

[Felipe Contreras <felipe.contreras@gmail.com>]

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@gmail.com> wrote:
> > > On Fri, Jun 6, 2014 at 4:16 AM, Michal Hocko <mhocko@suse.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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