[RFC] hotkey for disabling/enabling events in 'perf top' TUI was Re: [GIT PULL 0/8] perf/core improvements and fixes

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Thu, Jun 18, 2015 at 09:40:10AM +0200, Ingo Molnar escreveu:
> * Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> > User visible:

> > - Allow disabling/enabling events dynamicly in 'perf top':
> >   a 'perf top' session can instantly become a 'perf report'
> >   one, i.e. going from dynamic analysis to a static one,
> >   returning to a dynamic one is possible, to toogle the
> >   modes, just press CTRL+z. (Arnaldo Carvalho de Melo)
 
> Nice!! :-)
 
> Btw., it would be nice if the status line carried information about whether 
> collection is 'frozen' or running, at a glance. A hint might also suggest how to 
> unfreeze the session - in case someone pressed Ctrl-Z to suspend the perf top 
> session ...

Right, and I think we better find other hotkey and make Ctrl+Z work like
with other tools, i.e. suspend:

[acme@zoo linux]$ mutt

[1]+  Stopped                 mutt
[acme@zoo linux]$ vim

[2]+  Stopped                 vim
[acme@zoo linux]$ 

The perf TUI should work like that as well...

Ideas?

We already have:

h/?/F1        Show this window
UP/DOWN/PGUP
PGDN/SPACE    Navigate
q/ESC/CTRL+C  Exit browser

For multiple event sessions:

TAB/UNTAB     Switch events

For symbolic views (--sort has sym):

->            Zoom into DSO/Threads & Annotate current symbol
<-            Zoom out
a             Annotate current symbol
C             Collapse all callchains
d             Zoom into current DSO
D             Show some developer debug info
E             Expand all callchains
F             Toggle percentage of filtered entries
H             Display column headers
i             Show header information
P             Print histograms to perf.hist.N
r             Run available scripts
s             Switch to another data file in PWD
t             Zoom into current Thread
V             Verbose (DSO names in callchains, etc)
z             Toggle zeroing of samples 
/             Filter symbol by name 
 
> Also, there's now a GUI inconsistency with perf report: which will now exit on 
> Ctrl-Z. It should probably print a warning in the status line instead, that 
> freezing/unfreezing only works in 'perf top'.

I'll fix that.

- Arnaldo