Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1321630

Re: [BUG] scheduler doesn't balance thread to idle cpu for 3 seconds

Show all headers | View raw

On Thu, Jan 28, 2016 at 01:43:13PM -0500, Jan Stancek wrote:
> > How long should I have to wait for a fail?
> 
> It's about 1000-2000 iterations for me, which I think you covered
> by now in those 2 hours.

So I've been running:

  while ! ./pthread_cond_wait_1 ; do sleep 1; done

overnight on the machine, and have yet to hit a wobbly -- that is, its
still running.

Also note that I don't think failing this test is a bug per se.
Undesirable maybe, but within spec, since SIGALRM is process wide, so it
being delivered to the SCHED_OTHER task is accepted, and SCHED_OTHER has
no timeliness guarantees.

That said; if I could reliably reproduce I'd have a go at fixing this, I
suspect there's a 'fun' problem at the bottom of this.

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [BUG] scheduler doesn't balance thread to idle cpu for 3 seconds Jan Stancek <jstancek@redhat.com> - 2016-01-28 17:00 +0100
  Re: [BUG] scheduler doesn't balance thread to idle cpu for 3 seconds Peter Zijlstra <peterz@infradead.org> - 2016-01-28 18:50 +0100
    Re: [BUG] scheduler doesn't balance thread to idle cpu for 3  seconds Jan Stancek <jstancek@redhat.com> - 2016-01-28 20:00 +0100
      Re: [BUG] scheduler doesn't balance thread to idle cpu for 3 seconds Peter Zijlstra <peterz@infradead.org> - 2016-01-29 11:20 +0100
        Re: [BUG] scheduler doesn't balance thread to idle cpu for 3  seconds Jan Stancek <jstancek@redhat.com> - 2016-01-29 11:40 +0100
          Re: [BUG] scheduler doesn't balance thread to idle cpu for 3 seconds Jan Stancek <jstancek@redhat.com> - 2016-02-08 14:50 +0100

csiph-web