Re: [PATCH][RFC] bitbake-worker: set the process name when starting a task

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Wed, 2016-01-06 at 14:42 -0700, Christopher Larson wrote:
> On Wed, Jan 6, 2016 at 9:25 AM, Ross Burton <ross.burton@intel.com>
> wrote:
> > If the setproctitle module is present then use it to change the
> > process name
> > when the worker starts a task.  This results in each worker showing
> > what task it
> > is executing in a process listing.
> > 
> > Signed-off-by: Ross Burton <ross.burton@intel.com>
> > 
> Very nice. Do you know if it's overwriting just the process name or
> the entire commandline? I'm wondering if pkill bitbake-worker would
> do what you want, or if you'd still need to use pkill -f, for
> example. I'd like to see the toplevel bitbake processes named nicely
> without the python path and whatnot too eventually. We could also
> name the parallel parsing processes (though admittedly they're not
> long lived). Perhaps this should go into a helper function in
> bb.utils or bb.process?

There is a slightly more ugly version of this we could use:

def set_process_title(name):
    from ctypes import cdll, byref, create_string_buffer
    libc = cdll.LoadLibrary('libc.so.6')
    buff = create_string_buffer(len(name)+1)
    buff.value = name
    libc.prctl(15, byref(buff), 0, 0, 0)

which would then mean we don't have a dependency on the external
module. Obviously using ctypes is a bit nasty though.

I would like to see this markup the worker/cooker/UI threads and so
on...

Cheers,

Richard