On Sat, Jan 18, 2020 at 04:15:28PM -0800, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > situations, the udev events seem to cause useless tickling of udevd. > > [...] > > and I drew the following ballpark conclusion: > > 1.7% CPU time at 1 event/s -> 60 event/s 100% cpu > Thanks. What effect does this patch have upon these numbers? When I rerun the script with patched kernel, udev sit mostly idle (there were no other udev event sources). So the number can be said to drop to 0% CPU time / event/s. > Typically the author, but not always. If someone else is particularly > motivated to get a patch merged up they can take it over. Christopher, do you consider resending your patch? (I second that it exposes the internal details (wrt cgroup caches) and I can observe the just reading the events by udevd wastes CPU time.) Thanks, Michal
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