On Fri, 22 Jan 2016, kernel test robot wrote:
FYI, we noticed the below changes on
commit cb4bbc457bfed6194ffab1b10c7be73b3f16ca2d ("locking/mutexes: don't spin on
owner when wait list is not NULL.")
I'm not sure why this would even be reported, as this patch has not been accepted
or acked or nothin', by anyone. In this particular case that raw performance drop
is because spinning is pretty much disabled by Ding's change. Totally expected for
the kind of workload unixbench triggers.
All this does is hurt lkml-searchability.