Re: vm-pageout-throttling.patch: hanging in throttle_vm_writeout/blk_congestion_wait

[Hans Reiser]

Sami Farin wrote:

> On Mon, Nov 15, 2004 at 09:56:29PM +0000, Hugh Dickins wrote:
>  
>
> > On Mon, 15 Nov 2004, Sami Farin wrote:
> >    
> >
> > > this time I had some swapspace on /dev/loop1 (file-backed, reiserfs,
> > > loop-AES-2.2d)...  I think (!) it caused this deadlock.
> > >      
> > That's not at all surprising.  See the swap_extent work Andrew did
> > for 2.5 (in mm/swapfile.c), by which swap to a swapfile now avoids
> > the filesystem altogether (except while swapon prepares the map of
> > disk blocks).  By swapping to a loop device over a file, you're
> > sneaking past his work, and putting the filesystem back under swap.
> >    

Does Andrew's approach prevent putting swap on a compressed file (useful 
for reiser4 once the compression plugin is stable, not reiserfs)? (And 
no, I don't have any idea what the performance effect of that would be 
before it is tried and benchmarked....)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/