Messages in this thread | | | Date | Fri, 20 Jan 2006 09:12:32 +0100 | From | Jens Axboe <> | Subject | Re: Out of Memory: Killed process 16498 (java). |
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On Thu, Jan 19 2006, Andrew Morton wrote: > Dave Jones <davej@redhat.com> 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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