Re: [BUG] perf top: --stdio causes continuous refresh

[David Ahern]

On 2/6/14, 8:24 AM, Stephane Eranian wrote:
> On Thu, Feb 6, 2014 at 3:09 PM, Arnaldo Carvalho de Melo
> <acme@xxxxxxxxxx> wrote:
> > Em Thu, Feb 06, 2014 at 12:07:05PM -0200, Arnaldo Carvalho de Melo escreveu:
> > > Em Thu, Feb 06, 2014 at 02:58:01PM +0100, Stephane Eranian escreveu:
> > > > On Thu, Feb 6, 2014 at 2:56 PM, Arnaldo Carvalho de Melo
> > > > <acme@xxxxxxxxxx> wrote:
> > > > > Em Wed, Feb 05, 2014 at 10:25:09PM +0100, Stephane Eranian escreveu:
> > > > > > If you run perf top on 3.14 but you force --stdio mode, perf top
> > > > > > goes crazy and constantly refreshes the output.
> > >
> > > > > > It does that with many older versions of the perf as well on 3.14.
> > > > > > It runs fine with newt mode.
> > >
> > > > > > Works fine with my 3.11 kernel. So something must be broken
> > > > > > with 3.14.
> > >
> > > > > > Can you reproduce the problem as well?
> > >
> > > > > Not so far, using my perf/urgent branch:
> > >
> > > > I am using tip.git. Or try 3.11, 3.10.
> >
> > But my tests are on top of:
> >
> > [acme@ssdandy linux]$ uname -r
> > 3.11.4-101.fc18.x86_64
> >
> > I thought it was a 3.14ish one, building one to try there...
> The kernel must be 3.14-rcX, the tool can be any version.


I don't have time to do a git bisect, but I can narrow the window to 
3.13-rc6 and 3.14-rc1. Just happened to update a server yesterday. 
perf-top --stdio runs fine on the former and shows the problem on the 
latter.

David

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