Hello,

On Thu, Mar 24, 2011 at 10:41:51AM +0100, Tejun Heo wrote:

        USER   SYSTEM   SIRQ    CXTSW  THROUGHPUT
 SIMPLE 61107  354977    217  8099529  845.100 MB/sec
 SPIN   63140  364888    214  6840527  879.077 MB/sec

On various runs, the adaptive spinning trylock consistently posts
higher throughput.  The amount of difference varies but it outperforms
consistently.

I've been running more of these tests and am having doubts about the
consistency.  It seems that, even on a fresh filesystem, some random
initial condition seems to have persistent effect on the whole run.
I'll run more tests and report back.

Thanks.

-- 
tejun