On Sat, Jul 30, 2016 at 3:23 PM, Mateusz Guzik <m...@freebsd.org> wrote:
> Author: mjg
> Date: Sat Jul 30 22:23:31 2016
> New Revision: 303563
> URL: https://svnweb.freebsd.org/changeset/base/303563
>
> Log:
> sx: increment spin_cnt before cpu_spinwait in xlock
Looks like it's after cpu_spinwait instead.
>
> The change is a no-op only done for consistency with the rest of the file.
>
> Modified:
> head/sys/kern/kern_sx.c
>
> Modified: head/sys/kern/kern_sx.c
> ==============================================================================
> --- head/sys/kern/kern_sx.c Sat Jul 30 22:21:48 2016 (r303562)
> +++ head/sys/kern/kern_sx.c Sat Jul 30 22:23:31 2016 (r303563)
> @@ -889,10 +889,10 @@ _sx_slock_hard(struct sx *sx, int opts,
> GIANT_SAVE();
> while (SX_OWNER(sx->sx_lock) == x &&
> TD_IS_RUNNING(owner)) {
> + cpu_spinwait();
> #ifdef KDTRACE_HOOKS
> spin_cnt++;
> #endif
> - cpu_spinwait();
> }
> KTR_STATE0(KTR_SCHED, "thread",
> sched_tdname(curthread), "running");
>
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