On Tue, Nov 22, 2016 at 05:14:02PM +0100, Vlastimil Babka wrote: > On 11/22/2016 05:06 PM, Marc MERLIN wrote: > > On Mon, Nov 21, 2016 at 01:56:39PM -0800, Marc MERLIN wrote: > >> On Mon, Nov 21, 2016 at 10:50:20PM +0100, Vlastimil Babka wrote: > >>>> 4.9rc5 however seems to be doing better, and is still running after 18 > >>>> hours. However, I got a few page allocation failures as per below, but the > >>>> system seems to recover. > >>>> Vlastimil, do you want me to continue the copy on 4.9 (may take 3-5 days) > >>>> or is that good enough, and i should go back to 4.8.8 with that patch applied? > >>>> https://marc.info/?l=linux-mm&m=147423605024993 > >>> > >>> Hi, I think it's enough for 4.9 for now and I would appreciate trying > >>> 4.8 with that patch, yeah. > >> > >> So the good news is that it's been running for almost 5H and so far so good. > > > > And the better news is that the copy is still going strong, 4.4TB and > > going. So 4.8.8 is fixed with that one single patch as far as I'm > > concerned. > > > > So thanks for that, looks good to me to merge. > > Thanks a lot for the testing. So what do we do now about 4.8? (4.7 is > already EOL AFAICS). > > - send the patch [1] as 4.8-only stable. Greg won't like that, I expect. > - alternatively a simpler (againm 4.8-only) patch that just outright > prevents OOM for 0 < order < costly, as Michal already suggested. > - backport 10+ compaction patches to 4.8 stable > - something else? > > Michal? Linus? > > [1] https://marc.info/?l=linux-mm&m=147423605024993 Sorry for my molasses rate of feedback. I found a workaround, setting vm/watermark_scale_factor to 500, and threw that in sysctl. This was on the MythTV box that OOMs everything after about a day on 4.8 otherwise. I've been running [1] for 9 days on it (4.8.4 + [1]) without issue, but just realized I forgot to remove the watermark_scale_factor workaround. I've restored that now, so I'll see if it becomes unhappy by tomorrow. I also threw up a few other things you had asked for (vmstat, zoneinfo before and after the first OOM on 4.8.4): http://0x.ca/sim/ref/4.8.4/ (that was before booting into a rebuild with [1] applied) Simon- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>