Steps to Reproduce

Make the following change to mono/netcore/build.sh

Then run the following script by following the instructions in it.
profileMonoScript.sh.zip

Current Behavior

Heavy stack from ConcurrentQueueSegment, according to the following flamegraph (the highlighted area)

January 8 LLVM AOT flamegraph with ConcurrentQueueSegment<T>.TryDequeue highlighted:

Expected Behavior

ConcurrentQueueSegment which does only few Volatile.Reads should take a small portion of time of the whole program.

On which platforms did you notice this

[ ] macOS
[x] Linux
[ ] Windows

Version Used:

mono master: 61eb2be from Dec 30th, 2019