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Subject[PATCH 0/2] measure latency of cpu hotplug path
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There are all changes related to cpu hotplug path and would like to seek
upstream review. These are all patches in Qualcomm downstream kernel
for a quite long time. First patch sets the rt prioity to hotplug
task and second patch adds cpuhp trace events.

1) cpu-hotplug: Always use real time scheduling when hotplugging a CPU
2) cpu/hotplug: Add cpuhp_latency trace event

Example logs:-
cpu online -
cpuhp/4-200 [004] .... 223.891886: cpuhp_enter: cpu: 0004 target: 213 step: 212 (sched_cpu_activate)
cpuhp/4-200 [004] .... 223.891894: cpuhp_exit: cpu: 0004 state: 212 step: 212 ret: 0
sh-176 [000] .... 223.891912: cpuhp_exit: cpu: 0004 state: 213 step: 86 ret: 0
sh-176 [000] .... 223.891915: cpuhp_latency: cpu:4 state:online latency:3874 USEC ret: 0

cpu offline -
sh-176 [000] .... 265.193490: cpuhp_exit: cpu: 0004 state: 2 step: 2 ret: 0
sh-176 [000] .... 265.193494: cpuhp_latency: cpu:4 state:offline latency:57431 USEC ret: 0


Prasad Sodagudi (1):
cpu/hotplug: Add cpuhp_latency trace event

Syed Rameez Mustafa (1):
cpu-hotplug: Always use real time scheduling when hotplugging a CPU

include/trace/events/cpuhp.h | 29 +++++++++++++++++++++++++
kernel/cpu.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 79 insertions(+)

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