On Thu, Jan 19 2006, Andrew Morton wrote:
> Dave Jones <[email protected]> wrote:
> >
> > On Thu, Jan 19, 2006 at 03:11:45PM -0000, Andy Chittenden wrote:
> > > DMA free:20kB min:24kB low:28kB high:36kB active:0kB inactive:0kB
> > > present:12740kB pages_scanned:4 all_unreclaimable? yes
> >
> > Note we only scanned 4 pages before we gave up.
> > Larry Woodman came up with this patch below that clears all_unreclaimable
> > when in two places where we've made progress at freeing up some pages
> > which has helped oom situations for some of our users.
>
> That won't help - there are exactly zero pages on ZONE_DMA's LRU.
>
> The problem appears to be that all of the DMA zone has been gobbled up by
> the BIO layer. It seems quite inappropriate that a modern 64-bit machine
> is allocating tons of disk I/O pages from the teeny ZONE_DMA. I'm
> suspecting that someone has gone and set a queue's ->bounce_gfp to the wrong
> thing.
>
> Jens, would you have time to investigate please?
Certainly, I'll get this tested and fixed this afternoon. Andy, what are
you running that uses SG_IO - cd ripping, burning, something else?
--
Jens Axboe
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