Comment 5 for bug 1730782

No special request for bionic. Just for 18.10 will be enough.

only one is provided. Other 3 patches are not found. Upstream tested it that has been fixed.

https://www.spinics.net/lists/kernel/msg2552460.html

commit 8e1a2031e4b556b01ca53cd1fb2d83d811a6605b
Author: Alexey Budankov <email address hidden>
Date: Fri Sep 8 11:47:03 2017 +0300

perf/cor: Use RB trees for pinned/flexible groups

Change event groups into RB trees sorted by CPU and then by a 64bit
index, so that multiplexing hrtimer interrupt handler would be able
skipping to the current CPU's list and ignore groups allocated for the
other CPUs.