On Thu, 2008-01-10 at 00:41 +0530, Aneesh Kumar K.V wrote:
> On Wed, Jan 09, 2008 at 07:44:30PM +0100, Jan Kara wrote:
> > On Wed 09-01-08 23:54:28, Aneesh Kumar K.V wrote:
> > > On Wed, Jan 09, 2008 at 01:10:41PM +0100, Jan Kara wrote:
> > > > > With the multi block allocator when we don't have prealloc space we discard
> > > > > @@ -3790,7 +3782,9 @@ repeat:
> > > > >
> > > > > /* if we still need more blocks and some PAs were used, try again */
> > > > > if (free < needed && busy) {
> > > > > + busy = 0;
> > > > > ext4_unlock_group(sb, group);
> > > > > + schedule_timeout(HZ);
> > > > > goto repeat;
> > > > > }
> > > > Hmm, wouldn't just schedule() be enough here? That would give a good
> > > > chance to other processes to proceed and we would avoid this artificial
> > > > wait of 1s which is quite ugly IMO.
> > > >
> > >
> > > But then who will wake up the task ?. I have the below comment added to
> > > the patch in the patch queue.
> > As far as I know, you don't have to wake-up the task explicitely.
> > Scheduler will simply schedule the task sometime in future (it is a similar
> > situation as if the task got preempted in the kernel).
>
> I missed the current->state = TASK_UNINTERRUPTIBLE; in that code piece.
> So yes without setting the task state yes it would put it back to the run
> queue.Infact schedule_timeout() without changing the task state also
> behaves similarly. Now that that we know that it if fine just to have a
> schedule() there since schedule_timeout() was just behaving as
> schedule(). I guess we should make the change you suggested. In that
> case we can remove the comment which says we need to add the wait queue.
>
> Mingming,
>
> Do you want me to send a patch or can you make the modification ?
>
I could make the changes and update the mballoc patch in the queue.
Mingming
> -aneesh
>
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