On Tue 21-07-20 07:10:14, Qian Cai wrote: > > > > On Jul 21, 2020, at 2:33 AM, Michal Hocko <mhocko@xxxxxxxxxx> 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
