On 11/22/2016 10:46 PM, Simon Kirby wrote:
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.
Thanks for the testing. Could you now try Michal's stable candidate [1]
from this thread please?
[1] http://marc.info/?l=linux-mm&m=147988285831283&w=2
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-
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