Messages in this thread | | | Subject | Re: [(RT RFC) PATCH v2 2/9] sysctl for runtime-control of lateral mutex stealing | From | Sven-Thorsten Dietrich <> | Date | Mon, 25 Feb 2008 14:57:11 -0800 |
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On Mon, 2008-02-25 at 22:53 +0100, Pavel Machek wrote: > Hi! > > > From: Sven-Thorsten Dietrich <sdietrich@suse.de> > > > > Add /proc/sys/kernel/lateral_steal, to allow switching on and off > > equal-priority mutex stealing between threads. > > > > Signed-off-by: Sven-Thorsten Dietrich <sdietrich@suse.de> > > --- > > > > > > #include "rtmutex_common.h" > >
I'll move it to the header file.
> > > +#ifdef CONFIG_RTLOCK_LATERAL_STEAL > > +int rtmutex_lateral_steal __read_mostly = 1; > > +#endif > > + > > Ugly.. >
> > > /* > > * lock->owner state tracking: > > * > > @@ -321,7 +325,8 @@ static inline int lock_is_stealable(struct task_struct *pendowner, int unfair) > > if (current->prio > pendowner->prio) > > return 0; > > > > - if (!unfair && (current->prio == pendowner->prio)) > > + if (unlikely(current->prio == pendowner->prio) && > > + !(unfair && rtmutex_lateral_steal)) > > #endif > > But this is even worse, you are creating #ifdef maze here. Can you > simply #define rtmutex_lateral_steal 0 in !CONFIG_RTLOCK_LATERAL_STEAL > and let the optimizer fix this? >
Ok - much of this will also disappear into the header then.
> > > index c913d48..c24c53d 100644 > > --- a/kernel/sysctl.c > > +++ b/kernel/sysctl.c > > @@ -175,6 +175,10 @@ extern struct ctl_table inotify_table[]; > > int sysctl_legacy_va_layout; > > #endif > > > > +#ifdef CONFIG_RTLOCK_LATERAL_STEAL > > +extern int rtmutex_lateral_steal; > > +#endif > > + > > Try checkpatch. > Pavel
I have that as part of quilt refresh, and it returns:
Your patch has no obvious style problems and is ready for submission.
But Greg may need to enforce it on his git tree that he mails these from - are you referring to anything specific in this patch?
Sven
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