[LTP] [PATCH] read_all: retry to queue work for any worker

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> Hi!
> > +static void work_push_retry(int worker, const char *buf)
> > +{
> > +	int i, ret, worker_min, worker_max;
> > +
> > +	if (worker < 0) {
> > +		/* pick any, try -worker first */
> > +		worker_min = worker * (-1);
> > +		worker_max = worker_count;
> > +	} else {
> > +		/* keep trying worker */
> > +		worker_min = worker;
> > +		worker_max = worker + 1;
> > +	}
> > +	i = worker_min;
> > +
> > +	for (;;) {
> > +		ret = queue_push(workers[i].q, buf);
> > +		if (ret == 1)
> > +			break;
> > +
> > +		if (++i >= worker_max) {
> > +			i = worker_min;
> > +			usleep(100000);
> 
> 
> My only concern is that we sleep for too long here. Maybe we should
> start with smaller sleep here and increase it after a while.
> 
> Or have you checked that the tests runs as fast as if we had smaller
> sleep here?

Small benchmark shows that smaller sleep can complete faster. I'll send v2.

> 
> > +		}
> > +	}
> > +}
> > +
> >  static void stop_workers(void)
> >  {
> >  	const char stop_code[1] = { '\0' };
> > @@ -292,7 +319,7 @@ static void stop_workers(void)
> >  
> >  	for (i = 0; i < worker_count; i++) {
> >  		if (workers[i].q)
> > -			TST_RETRY_FUNC(queue_push(workers[i].q, stop_code), 1);
> > +			work_push_retry(i, stop_code);
> >  	}
> >  
> >  	for (i = 0; i < worker_count; i++) {
> > @@ -310,7 +337,7 @@ static void rep_sched_work(const char *path, int rep)
> >  	for (i = j = 0; i < rep; i++, j++) {
> >  		if (j >= worker_count)
> >  			j = 0;
> > -		TST_RETRY_FUNC(queue_push(workers[j].q, path), 1);
> > +		work_push_retry(-j, path);
> >  	}
> >  }
> >  
> > --
> > 1.8.3.1
> > 
> > 
> > --
> > Mailing list info: https://lists.linux.it/listinfo/ltp
> 
> --
> Cyril Hrubis
> chrubis@suse.cz
>