On Sun, Dec 02, 2007 at 03:58:21PM -0600, Eric Haszlakiewicz wrote:

> except what you really need is more like:
> 
> while (something_to_be_flushed) {
>   if (systat_disk_%busy >= 90) {
> 	temporarily_let_new_io_bypass_softdep()
>   }
>   else
>     turn_off_bypass()
>   flush_some_data();
> };

I don't know the details of softdep, but the idea is to only make 
i/o with some ordering constraints, such that a certain state of 
the disk is always guaranteed, right?

Now guess what happens when you temporarily bypass softdep's ordering.


	-is