git: kernel - Optimize shared -> excl spinlock contention

[Matthew Dillon]

commit 1b8fb8d2a5ce36dee333be7a40858036d134ec57
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Wed Oct 4 22:04:13 2017 -0700

    kernel - Optimize shared -> excl spinlock contention
    
    * When exclusive request is spinning waiting for shared holders to
      release, throw in addition cpu_pause()'s based on the number of
      shared holders.
    
    Suggested-by: mjg_

Summary of changes:
 sys/kern/kern_spinlock.c | 65 ++++++++++++++++++++++++------------------------
 1 file changed, 33 insertions(+), 32 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/1b8fb8d2a5ce36dee333be7a40858036d134ec57


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