Messages in this thread | | | Date | Tue, 21 Jul 2020 13:25:29 +0200 | From | Michal Hocko <> | Subject | Re: [RFC PATCH] mm: silence soft lockups from unlock_page |
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On Tue 21-07-20 07:10:14, Qian Cai wrote: > > > > On Jul 21, 2020, at 2:33 AM, Michal Hocko <mhocko@kernel.org> wrote: > > > > on a large ppc machine. The very likely cause is a suboptimal > > configuration when systed-udev spawns way too many workders to bring the > > system up. > > This is strange. The problem description is missing quite a few > important details. For example, what systems exactly are those? How > many CPUs, memory and NUMA nodes were you talking about?
Are these really important? I believe I can dig that out from the bug report but I didn't really consider that important enough.
> Which kernel version was it reported?
It is a SLES 4.12 based kernel with the said commit backported. The page lock internals are thus in line with the upstream kernel.
> How many workers from systemd-udev was “misconfigured”?
I do not know that information. I believe that it used whatever systemd comes with as a default. And that can be a lot.
Do you have any actual feedback to the patch?
-- Michal Hocko SUSE Labs
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