Date: Sun, 31 Jul 2016 02:46:09 +0200 From: Mateusz Guzik <mjguzik@gmail.com> To: Conrad Meyer <cem@freebsd.org> Cc: Mateusz Guzik <mjg@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r303563 - head/sys/kern Message-ID: <20160731004609.GA9408@dft-labs.eu> In-Reply-To: <CAG6CVpXmZL3Vm85B5Fg-8MNzJu8E7vjS4OWxxEdZxFEu9CVSKQ@mail.gmail.com> References: <201607302223.u6UMNWD7037665@repo.freebsd.org> <CAG6CVpXmZL3Vm85B5Fg-8MNzJu8E7vjS4OWxxEdZxFEu9CVSKQ@mail.gmail.com>
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On Sat, Jul 30, 2016 at 05:44:16PM -0700, Conrad Meyer wrote: > On Sat, Jul 30, 2016 at 3:23 PM, Mateusz Guzik <mjg@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. > Brainfarted the commit message. The actual order as seen is the patch is what's seen in the file. > > > > 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"); > > -- Mateusz Guzik <mjguzik gmail.com>
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