Re: PATCH: sleeping while holding a lock in _pagebuf_free_bh()::page_buf.c

[Luben Tuikov <luben@xxxxxxxxxxxx>]

Christoph Hellwig wrote:
> 
> On Tue, Oct 22, 2002 at 03:55:43PM -0400, Luben Tuikov wrote:
> > This is what wake_up_sync() does. wake_up() may reschedule
> > on an SMP system, since the other CPUs may be able to get
> > another task to run. This is why there are two different
> > implementations wake_up() and wake_up_sync().
> >
> > If you have 4 CPUs, 3 idle and call wake_up() why should
> > the 3 idle CPUs _STAY_ idle, _until_ you (later) call schedule()
> > and _then_ to schedule another task on the idle CPUs, and
> > you to continue to go on, say if you were a SCHED_FIFO, or
> > SCHED_OTHER...
> >
> > BTW, that the _whole_ point of SMP -- _symmetric_ MP.
> 
> Could you please give me some of thev crack you're smoking?

Yep, real professional!
 
-- 
Luben