* Jens Axboe <jens.axboe@oracle.com> wrote:

> On Thu, Sep 10 2009, Peter Zijlstra wrote:
> > On Wed, 2009-09-09 at 14:20 +0200, Jens Axboe wrote:
> > > 
> > > One thing I also noticed is that when I have logged in, I run xmodmap
> > > manually to load some keymappings (I always tell myself to add this to
> > > the log in scripts, but I suspend/resume this laptop for weeks at the
> > > time and forget before the next boot). With the stock kernel, xmodmap
> > > will halt X updates and take forever to run. With BFS, it returned
> > > instantly. As I would expect.
> > 
> > Can you provide a little more detail (I'm a xmodmap n00b), how 
> > does one run xmodmap and maybe provide your xmodmap config?
> 
> Will do, let me get the notebook and strace time it on both bfs 
> and mainline.

A 'perf stat' comparison would be nice as well - that will show us 
events strace doesnt show, and shows us the basic scheduler behavior 
as well.

A 'full' trace could be done as well via trace-cmd.c (attached), if 
you enable:

  CONFIG_CONTEXT_SWITCH_TRACER=y

and did something like:

  trace-cmd -s xmodmap ... > trace.txt

	Ingo